*********
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*********
The Project 64 etext of several Commodore 64 memory maps. Converted
to etext by anonymous. The original etexts were transferred from
ftp://arnold.hiof.no/programs and concatenated into one document.
Commodore_64_IO_Maps.doc
Commodore_64_Memory_Maps.txt
Commodore_64_RAM_Memory_Map.doc
Commodore_64_ROM_Memory_Map.doc
Commodore_64_ROM_Memory_Map.txt
64MAP10.TXT, June 1996, etext #41.
*********
The Project 64 etext of Commodore_64_IO_Maps.doc
*********
; Commodore 64 I/O Map
; V1.1 1 Jun 1994
COMMODORE 64 INPUT/OUTPUT ASSIGNMENTS
HEX DECIMAL BITS DESCRIPTION
0000 0 7-0 MOS 6510 Data Direction
Register (xx101111)
Bit= 1: Output, Bit=0:
Input, x=Don't Care
0001 1 MOS 6510 Micro-Processor
On-Chip I/O Port
0 /LORAM Signal (0=Switch BASIC ROM Out)
1 /HIRAM Signal (0=Switch Kernal ROM Out)
2 /CHAREN Signal (0=Swith Char. ROM In)
3 Cassette Data Output Line
4 Cassette Switch Sense: 1 = Switch Closed
5 Cassette Motor Control
O = ON, 1 = OFF
6-7 Undefined
D000-D02E 53248-54271 MOS 6566 VIDEO INTERFACE CONTROLLER (VIC)
D000 53248 Sprite 0 X Pos
D001 53249 Sprite 0 Y Pos
D002 53250 Sprite 1 X Pos
D003 53251 Sprite 1 Y Pos
D004 53252 Sprite 2 X Pos
D005 53253 Sprite 2 Y Pos
D006 53254 Sprite 3 X Pos
D007 53255 Sprite 3 Y Pos
D008 53256 Sprite 4 X Pos
D009 53257 Sprite 4 Y Pos
D00A 53258 Sprite 5 X Pos
D00B 53259 Sprite 5 Y Pos
D00C 53260 Sprite 6 X Pos
D00D 53261 Sprite 6 Y Pos
D00E 53262 Sprite 7 X Pos
D00F 53263 Sprite 7 Y Pos
D010 53264 Sprites 0-7 X Pos (msb of X coord.)
D011 53265 VIC Control Register
7 Raster Compare: (Bit 8) See 53266
6 Extended Color Text Mode 1 = Enable
5 Bit Map Mode. 1 = Enable
4 Blank Screen to Border Color: 0 = Blank
3 Select 24/25 Row Text Display: 1 = 25 Rows
2-0 Smooth Scroll to Y Dot-Position (0-7)
D012 53266 Read Raster / Write Raster Value for Compare
IRQ
D013 53267 Light-Pen Latch X Pos
D014 53268 Light-Pen Latch Y Pos
D015 53269 Sprite display Enable: 1 = Enable
D016 53270 VIC Control Register
7-6 Unused
5 ALWAYS SET THIS BIT TO 0 !
4 Multi-Color Mode: 1 = Enable (Text or
Bit-Map)
3 Select 38/40 Column Text Display: 1 = 40 Cols
2-0 Smooth Scroll to X Pos
D017 53271 Sprites 0-7 Expand 2x Vertical (Y)
D018 53272 VIC Memory Control Register
7-4 Video Matrix Base Address (inside VIC)
3-1 Character Dot-Data Base Address (inside VIC)
0 Select upper/lower Character Set
D019 53273 VIC Interrupt Flag Register (Bit = 1: IRQ
Occurred)
7 Set on Any Enabled VIC IRQ Condition
3 Light-Pen Triggered IRQ Flag
2 Sprite to Sprite Collision IRQ Flag
1 Sprite to Background Collision IRQ Flag
0 Raster Compare IRQ Flag
D01A 53274 IRQ Mask Register: 1 = Interrupt Enabled
D01B 53275 Sprite to Background Display Priority:
1 = Sprite
D01C 53276 Sprites 0-7 Multi-Color Mode Select:
1 = M.C.M.
D01D 53277 Sprites 0-7 Expand 2x Horizontal (X)
D01E 53278 Sprite to Sprite Collision Detect
D01F 53279 Sprite to Background Collision Detect
D020 53280 Border Color
D021 53281 Background Color 0
D022 53282 Background Color 1
D023 53283 Background Color 2
D024 53284 Background Color 3
D025 53285 Sprite Multi-Color Register 0
D026 53286 Sprite Multi-Color Register 1
D027 53287 Sprite 0 Color
D028 53288 Sprite 1 Color
D029 53289 Sprite 2 Color
D02A 53290 Sprite 3 Color
D02B 53291 Sprite 4 Color
D02C 53292 Sprite 5 Color
D02D 53293 Sprite 6 Color
D02E 53294 Sprite 7 Color
D400-D7FF 54272-55295 MOS 6581 SOUND INTERFACE DEVICE (SID)
D400 54272 Voice 1: Frequency Control - Low-Byte
D401 54273 Voice 1: Frequency Control - High-Byte
D402 54274 Voice 1: Pulse Waveform Width - Low-Byte
D403 54275 7-4 Unused
3-0 Voice 1: Pulse Waveform Width - High-Nybble
D404 54276 Voice 1: Control Register
7 Select Random Noise Waveform, 1 = On
6 Select Pulse Waveform, 1 = On
5 Select Sawtooth Waveform, 1 = On
4 Select Triangle Waveform, 1 = On
3 Test Bit: 1 = Disable Oscillator 1
2 Ring Modulate Osc. 1 with Osc. 3 Output,
1 = On
1 Synchronize Osc. 1 with Osc. 3 Frequency,
1 = On
0 Gate Bit: 1 = Start Att/Dec/Sus,
0 = Start Release
D405 54277 Envelope Generator 1: Attack / Decay Cycle
Control
7-4 Select Attack Cycle Duration: 0-15
3-0 Select Decay Cycle Duration: 0-15
D406 54278 Envelope Generator 1: Sustain / Release Cycle
Control
7-4 Select Sustain Cycle Duration: 0-15
3-0 Select Release Cycle Duration: 0-15
D407 54279 Voice 2: Frequency Control - Low-Byte
D408 54280 Voice 2: Frequency Control - High-Byte
D409 54281 Voice 2: Pulse Waveform Width - Low-Byte
D40A 54282 7-4 Unused
3-0 Voice 2: Pulse Waveform Width - High-Nybble
D40B 54283 Voice 2: Control Register
7 Select Random Noise Waveform, 1 = On
6 Select Pulse Waveform, 1 = On
5 Select Sawtooth Waveform, 1 = On
4 Select Triangle Waveform, 1 = On
3 Test Bit: 1 = Disable Oscillator 1
2 Ring Modulate Osc. 2 with Osc. 1 Output,
1 = On
1 Synchronize Osc. 2 with Osc. 1 Frequency,
1 = On
0 Gate Bit: 1 = Start Att/Dec/Sus,
0 = Start Release
D40C 54284 Envelope Generator 2: Attack / Decay Cycle
Control
7-4 Select Attack Cycle Duration: O-15
3-0 Select Decay Cycle Duration: 0-15
D40D 54285 Envelope Generator 2: Sustain / Release Cycle
Control
7-4 Select Sustain Cycle Duration: O-15
3-0 Select Release Cycle Duration: O-15
D40E 54286 Voice 3: Frequency Control - Low-Byte
D40F 54287 Voice 3: Frequency Control - High-Byte
D410 54288 Voice 3: Pulse Waveform Width - Low-Byte
D411 54289 7-4 Unused
3-0 Voice 3: Pulse Waveform Width - High-Nybble
D412 54290 Voice 3: Control Register
7 Select Random Noise Waveform, 1 = On
6 Select Pulse Waveform, 1 = On
5 Select Sawtooth Waveform, 1 = On
4 Select Triangle Waveform, 1 = On
3 Test Bit: 1 = Disable Oscillator 1
2 Ring Modulate Osc. 3 with Osc. 2 Output,
1 = On
1 Synchronize Osc. 3 with Osc. 2 Frequency,
1 = On
0 Gate Bit: 1 = Start Att/Dec/Sus,
0 = Start Release
D413 54291 Envelope Generator 3: Attac/Decay Cycle Control
7-4 Select Attack Cycle Duration: 0-15
3-0 Select Decay Cycle Duration: 0-15
D414 54285 Envelope Generator 3: Sustain / Release Cycle
Control
7-4 Select Sustain Cycle Duration: 0-15
3-0 Select Release Cycle Duration: 0-15
D415 54293 Filter Cutoff Frequency: Low-Nybble
(Bits 2-0)
D416 54294 Filter Cutoff Frequency: High-Byte
D417 54295 Filter Resonance Control / Voice Input
Control
7-4 Select Filter Resonance: 0-15
3 Filter External Input: 1 = Yes, 0 = No
2 Filter Voice 3 Output: 1 = Yes, 0 = No
Filter Voice 2 Output: 1 = Yes, 0 = No
0 Filter Voice 1 Output: 1 = Yes, 0 = No
D418 54296 Select Filter Mode and Volume
7 Cut-Off Voice 3 Output: 1 = Off, 0 = On
6 Select Filter High-Pass Mode: 1 = On
5 Select Filter Band-Pass Mode: 1 = On
4 Select Filter Low-Pass Mode: 1 = On
3-0 Select Output Volume: 0-15
D419 54297 Analog/Digital Converter: Game Paddle 1
(0-255)
D41A 54298 Analog/Digital Converter Game Paddle 2
(0-255)
D41B 54299 Oscillator 3 Random Number Generator
D41C 54230 Envelope Generator 3 Output
D500-D7FF 54528-55295 SID IMAGES
D800-DBFF 55296-56319 Color RAM (Nybbles)
DC00-DCFF 56320-56575 MOS 6526 Complex Interface Adapter (CIA) #1
DC00 56320 Data Port A (Keyboard, Joystick, Paddles,
Light-Pen)
7-0 Write Keyboard Column Values for Keyboard
Scan
7-6 Read Paddles on Port A / B (01 = Port A,
10 = Port B)
4 Joystick A Fire Button: 1 = Fire
3-2 Paddle Fire Buttons
3-0 Joystick A Direction (0-15)
DC01 56321 Data Port B (Keyboard, Joystick, Paddles):
Game Port 1
7-0 Read Keyboard Row Values for Keyboard Scan
7 Timer B Toggle/Pulse Output
6 Timer A: Toggle/Pulse Output
4 Joystick 1 Fire Button: 1 = Fire
3-2 Paddle Fire Buttons
3-0 Joystick 1 Direction
DC02 56322 Data Direction Register - Port A (56320)
DC03 56323 Data Direction Register - Port B (56321)
DC04 56324 Timer A: Low-Byte
DC05 56325 Timer A: High-Byte
DC06 56326 Timer B: Low-Byte
DC07 56327 Timer B: High-Byte
DC08 56328 Time-of-Day Clock: 1/10 Seconds
DC09 56329 Time-of-Day Clock: Seconds
DC0A 56330 Time-of-Day Clock: Minutes
DC0B 56331 Time-of-Day Clock: Hours + AM/PM Flag (Bit 7)
DC0C 56332 Synchronous Serial I/O Data Buffer
DC0D 56333 CIA Interrupt Control Register (Read
IRQs/Write Mask)
7 IRQ Flag (1 = IRQ Occurred) / Set-Clear Flag
4 FLAG1 IRQ (Cassette Read / Serial Bus SRQ
Input)
3 Serial Port Interrupt
2 Time-of-Day Clock Alarm Interrupt
1 Timer B Interrupt
0 Timer A Interrupt
DC0E 56334 CIA Control Register A
7 Time-of-Day Clock Frequency: 1 = 50 Hz,
0 = 60 Hz
6 Serial Port I/O Mode Output, 0 = Input
5 Timer A Counts: 1 = CNT Signals,
0 = System 02 Clock
4 Force Load Timer A: 1 = Yes
3 Timer A Run Mode: 1 = One-Shot,
0 = Continuous
2 Timer A Output Mode to PB6: 1 = Toggle,
0 = Pulse
1 Timer A Output on PB6: 1 = Yes, 0 = No
0 Start/Stop Timer A: 1 = Start, 0 = Stop
DC0F 56335 CIA Control Register B
7 Set Alarm/TOD-Clock: 1 = Alarm, 0 = Clock
6-5 Timer B Mode Select:
00 = Count System 02 Clock Pulses
01 = Count Positive CNT Transitions
10 = Count Timer A Underflow Pulses
11 = Count Timer A Underflows While
CNT Positive
4-0 Same as CIA Control Reg. A - for Timer B
DD00-DDFF 56576-56831 MOS 6526 Complex Interface Adapter
(CIA) #2
DD00 56576 Data Port A (Serial Bus, RS-232, VIC Memory
Control)
7 Serial Bus Data Input
6 Serial Bus Clock Pulse Input
5 Serial Bus Data Output
4 Serial Bus Clock Pulse Output
3 Serial Bus ATN Signal Output
2 RS-232 Data Output (User Port)
1-0 VIC Chip System Memory Bank Select
(Default = 11)
DD01 56577 Data Port B (User Port, RS-232)
7 User / RS-232 Data Set Ready
6 User / RS-232 Clear to Send
5 User
4 User / RS-232 Carrier Detect
3 User / RS-232 Ring Indicator
2 User / RS-232 Data Terminal Ready
1 User / RS-232 Request to Send
0 User / RS-232 Received Data
DD02 56578 Data Direction Register - Port A
DD03 56579 Data Direction Register - Port B
DD04 56580 Timer A: Low-Byte
DD05 56581 Timer A: High-Byte
DD06 56582 Timer B: Low-Byte
DD07 56583 Timer B: High-Byte
DD08 56584 Time-of-Day Clock: 1/10 Seconds
DD09 56585 Time-of-Day Clock: Seconds
DD0A 56586 Time-of-Day Clock: Minutes
DD0B 56587 Time-of-Day Clock: Hours + AM/PM Flag (Bit 7)
DD0C 56588 Synchronous Serial I/O Data Buffer
DD0D 56589 CIA Interrupt Control Register (Read
NMls/Write Mask)
7 NMI Flag (1 = NMI Occurred) / Set-Clear Flag
4 FLAG1 NMI (User/RS-232 Received Data Input)
3 Serial Port Interrupt
1 Timer B Interrupt
0 Timer A Interrupt
DD0E 56590 CIA Control Register A
7 Time-of-Day Clock Frequency: 1 = 50 Hz,
0 = 60 Hz
6 Serial Port I/O Mode Output, 0 = Input
5 Timer A Counts: 1 = CNT Signals,
0 = System 02 Clock
4 Force Load Timer A: 1 = Yes
3 Timer A Run Mode: 1 = One-Shot,
0 = Continuous
2 Timer A Output Mode to PB6: 1 = Toggle,
0 = Pulse
1 Timer A Output on PB6: 1 = Yes, 0 = No
0 Start/Stop Timer A: 1 = Start, 0 = Stop
DD0F 56591 CIA Control Register B
7 Set Alarm/TOD-Clock: 1 = Alarm, 0 = Clock
6-5 Timer B Mode Select:
00 = Count System 02 Clock Pulses
01 = Count Positive CNT Transitions
10 = Count Timer A Underflow Pulses
11 = Count Timer A Underflows While
CNT Positive
4-0 Same as CIA Control Reg. A - for Timer B
DE00-DEFF 56832-57087 Reserved for Future I/O Expansion
DF00-DFFF 57088-57343 Reserved for Future I/O Expansion
*********
End of the Project 64 etext of Commodore_64_IO_Maps.doc
*********
The Project 64 etext of Commodore_64_Memory_Maps.txt
*********
COMMODORE 64 MEMORY MAPS
ADDRESS
LABEL HEX DEC DESCRIPTION
----------------------------------------------------------------------------
D6510 0000 0 6510 On-chip Data Direction Register.
R6510 0001 1 6510 On-chip 8-bit Input/Output Register.
TEMP 0002 2 Unused. Free for user programs.
ADRAY1 0003-0004 3 Jump Vector: Convert FAC to Integer in (A/Y)
($B1AA).
ADRAY2 0005-0006 5 Jump Vector: Convert Integer in (A/Y) to
Floating point in (FAC); ($B391).
CHARAC 0007 7 Search Character/Temporary Integer during INT.
ENDCHR 0008 8 Flag: Scan for Quote at end of String.
INTEGR 0007-0008 7 Temporary Integer during OR/AND.
TRMPOS 0009 9 Screen Column for last TAB.
VERCK 000A 10 Flag: 0 = Load, 1 = Verify.
COUNT 000B 11 Input Buffer Pointer/Number of Subscripts.
DIMFLG 000C 12 Flag: Default Array dimension.
VALTYP 000D 13 Data type Flag: $00 = Numeric, $FF = String.
INTFLG 000E 14 Data type Flag: $00 = Floating point, $80 =
Integer.
GARBFL 000F 15 Flag: DATA scan/List Quote/Garbage collection.
SUBFLG 0010 16 Flag: Subscript reference/User Function call.
INPFLG 0011 17 Input Flag: $00 = INPUT, $40 = GET, $98 =
READ.
TANSGN 0012 18 Flag: TAN sign/Comparative result.
CHANNL 0013 19 File number of current Input Device.
LINNUM 0014-0015 20 Temporary: Integer value.
TEMPPT 0016 22 Pointer: Temporary String Stack.
LASTPT 0017-0018 23 Last temporary String Address.
TEMPST 0019-0021 25 Stack for temporary Strings.
INDEX 0022-0025 34 Utility Pointer Area.
INDEX1 0022-0023 34 First Utility Pointer.
INDEX2 0024-0025 36 Secong Utility Pointer.
RESHO 0026-002A 38 Floating point product of Multiply and
Divide.
TXTTAB 002B-002C 43 Pointer: Start of BASIC Text Area ($0801).
VARTAB 002D-002E 45 Pointer: Start of BASIC Variables.
ARYTAB 002F-0030 47 Pointer: Start of BASIC Arrays.
STREND 0031-0032 49 Pointer: End of BASIC Arrays + 1.
FRETOP 0033-0034 51 Pointer: Bottom of String space.
FRESPC 0035-0036 53 Utility String Pointer.
MEMSIZ 0037-0038 55 Pointer: Highest Address available to BASIC
($A000).
CURLIN 0039-003A 57 Current BASIC Line number.
OLDLIN 003B-003C 59 Previous BASIC Line number.
OLDTXT 003D-003E 61 Pointer: BASIC Statement for CONT.
DATLIN 003F-0040 63 Current DATA Line number.
DATPTR 0041-0042 65 Pointer: Used by READ - current DATA Item
Address.
INPPTR 0043-0044 67 Pointer: Temporary storage of Pointer during
INPUT Routine.
VARNAM 0045-0046 69 Name of Variable being sought in Variable
Table.
VARPNT 0047-0048 71 Pointer: to value of (VARNAM) if Integer, to
descriptor if String.
FORPNT 0049-004A 73 Pointer: Index Variable for FOR/NEXT loop.
VARTXT 004B-004C 75 Temporary storage for TXTPTR during READ,
INPUT and GET.
OPMASK 004D 77 Mask used during FRMEVL.
TEMPF3 004E-0052 78 Temporary storage for FLPT value.
FOUR6 0053 83 Length of String Variable during Garbege
collection.
JMPER 0054-0056 84 Jump Vector used in Function Evaluation -
JMP followed by Address ($4C,$LB,$MB).
TEMPF1 0057-005B 87 Temporary storage for FLPT value.
TEMPF2 005C-0060 92 Temporary storage for FLPT value.
FAC 0061-0066 97 Main Floating point Accumulator.
FACEXP 0061 97 FAC Exponent.
FACHO 0062-0065 98 FAC Mantissa.
FACSGN 0066 102 FAC Sign.
SGNFLG 0067 103 Pointer: Series Evaluation Constant.
BITS 0068 104 Bit Overflow Area during normalisation
Routine.
AFAC 0069-006E 105 Auxiliary Floating point Accumulator.
ARGEXP 0069 105 AFAC Exponent.
ARGHO 006A-006D 106 AFAC Mantissa.
ARGSGN 006E 110 AFAC Sign.
ARISGN 006F 111 Sign of result of Arithmetic Evaluation.
FACOV 0070 112 FAC low-order rounding.
FBUFPT 0071-0072 113 Pointer: Used during CRUNCH/ASCII conversion.
CHRGET 0073-008A 115 Subroutine: Get next Byte of BASIC Text.
,0073 INC $7A ,0082 BEQ $0073
,0075 BNE $0079 ,0084 SEC
,0077 INC $7B ,0085 SBC #$30
! ,0079 LDA $0801 ,0087 SEC
,007C CMP #$3A ,0088 SBC #$D0
,007E BCS $008A ,008A RTS
,0080 CMP #$20
CHRGOT 0079 121 Entry to Get same Byte again.
TXTPTR 007A-007B 122 Pointer: Current Byte of BASIC Text.
RNDX 008B-008F 139 Floating RND Function Seed Value.
STATUS 0090 144 Kernal I/O Status Word ST.
STKEY 0091 145 Flag: $7F = STOP key.
SVXT 0092 146 Timing Constant for Tape.
VERCKK 0093 147 Flag: 0 = Load, 1 = Verify.
C3PO 0094 148 Flag: Serial Bus - Output Character buffered.
BSOUR 0095 149 Buffered Character for Serial Bus.
SYNO 0096 150 Cassette Sync. number.
TEMPX 0097 151 Temporary storage of X Register during CHRIN.
TEMPY 0097 151 Temporary storage of Y Register during RS232
fetch.
LDTND 0098 152 Number of Open Files/Index to File Table.
DFLTN 0099 153 Default Input Device (0).
DFLTO 009A 154 Default Output Device (3).
PRTY 009B 155 Parity of Byte Output to Tape.
DPSW 009C 156 Flag: Byte received from Tape.
MSGFLG 009D 157 Flag: $00 = Program mode: Suppress Error
Messages, $40 = Kernal Error Messages only,
$80 = Direct mode: Full Error Messages.
FNMIDX 009E 158 Index to Cassette File name/Header ID for
Tape write.
PTR1 009E 158 Tape Error log pass 1.
PTR2 009F 159 Tape Error log pass 2.
TIME 00A0-00A2 160 Real-time jiffy Clock (Updated by IRQ
Interrupt approx. every 1/60 of Second);
Update Routine: UDTIMK ($F69B).
TSFCNT 00A3 163 Bit Counter Tape Read or Write/Serial Bus
EOI (End Of Input) Flag.
TBTCNT 00A4 164 Pulse Counter Tape Read or Write/Serial Bus
shift Counter.
CNTDN 00A5 165 Tape Synchronising count down.
BUFPNT 00A6 166 Pointer: Tape I/O buffer.
INBIT 00A7 167 RS232 temporary for received Bit/Tape
temporary.
BITC1 00A8 168 RS232 Input Bit count/Tape temporary.
RINONE 00A9 169 RS232 Flag: Start Bit check/Tape temporary.
RIDATA 00AA 170 RS232 Input Byte Buffer/Tape temporary.
RIPRTY 00AB 171 RS232 Input parity/Tape temporary.
SAL 00AC-00AD 172 Pointer: Tape Buffer/Screen scrolling.
EAL 00AE-00AF 174 Tape End Address/End of Program.
CMPO 00B0-00B1 176 Tape timing Constants.
TAPE1 00B2-00B3 178 Pointer: Start Address of Tape Buffer ($033C).
BITTS 00B4 180 RS232 Write bit count/Tape Read timing Flag.
NXTBIT 00B5 181 RS232 Next Bit to send/Tape Read - End of
Tape.
RODATA 00B6 182 RS232 Output Byte Buffer/Tape Read Error Flag.
FNLEN 00B7 183 Number of Characters in Filename.
LA 00B8 184 Current File - Logical File number.
SA 00B9 185 Current File - Secondary Address.
FA 00BA 186 Current File - First Address (Device number).
OPEN LA,FA,SA; OPEN 1,8,15,"I0":CLOSE 1
FNADR 00BB-00BC 187 Pointer: Current File name Address.
ROPRTY 00BD 189 RS232 Output Parity/Tape Byte to be Input or
Output.
FSBLK 00BE 190 Tape Input/Output Block count.
MYCH 00BF 191 Serial Word Buffer.
CAS1 00C0 192 Tape Motor Switch.
STAL 00C1-00C2 193 Start Address for LOAD and Cassette Write.
MEMUSS 00C3-00C4 195 Pointer: Type 3 Tape LOAD and general use.
LSTX 00C5 197 Matrix value of last Key pressed; No Key = $40.
NDX 00C6 198 Number of Characters in Keyboard Buffer
queue.
RVS 00C7 199 Flag: Reverse On/Off; On = $01, Off = $00.
INDX 00C8 200 Pointer: End of Line for Input (Used to
suppress trailing spaces).
LXSP 00C9-00CA 201 Cursor X/Y (Line/Column) position at start of
Input.
SFDX 00CB 203 Flag: Print shifted Characters.
BLNSW 00CC 204 Flag: Cursor blink; $00 = Enabled, $01 =
Disabled.
BLNCT 00CD 205 Timer: Count down for Cursor blink toggle.
GDBLN 00CE 206 Character under Cursor while Cursor Inverted.
BLNON 00CF 207 Flag: Cursor Status; $00 = Off, $01 = On.
CRSW 00D0 208 Flag: Input from Screen = $03, or Keyboard =
$00.
PNT 00D1-00D2 209 Pointer: Current Screen Line Address.
PNTR 00D3 211 Cursor Column on current Line, including
Wrap-round Line, if any.
QTSW 00D4 212 Flag: Editor in Quote Mode; $00 = Not.
LNMX 00D5 213 Current logical Line length: 39 or 79.
TBLX 00D6 214 Current Screen Line number of Cursor.
SCHAR 00D7 215 Screen value of current Input Character/Last
Character Output.
INSRT 00D8 216 Count of number of inserts outstanding.
LDTB1 00D9-00F2 217 Screen Line link Table/Editor temporaries.
High Byte of Line Screen Memory Location.
USER 00F3-00F4 243 Pointer: Current Colour RAM Location.
KEYTAB 00F5-00F6 245 Vector: Current Keyboard decoding Table.
($EB81)
RIBUF 00F7-00F8 247 RS232 Input Buffer Pointer.
ROBUF 00F9-00FA 249 RS232 Output Buffer Pointer.
FREKZP 00FB-00FE 251 Free Zero Page space for User Programs.
BASZPT 00FF 255 BASIC temporary Data Area.
ASCWRK 00FF-010A 255 Assembly Area for Floating point to ASCII
conversion.
BAD 0100-013E 256 Tape Input Error log.
STACK 0100-01FF 256 6510 Hardware Stack Area.
BSTACK 013F-01FF 319 BASIC Stack Area.
BUF 0200-0258 512 BASIC Input Buffer (Input Line from Screen).
LAT 0259-0262 601 Kernal Table: Active logical File numbers.
FAT 0263-026C 611 Kernal Table: Active File First Addresses
(Device numbers).
SAT 026D-0276 621 Kernal Table: Active File Secondary
Addresses.
KEYD 0277-0280 631 Keyboard Buffer Queue (FIFO).
MEMSTR 0281-0282 641 Pointer: Bottom of Memory for Operating
System ($0800).
MEMSIZ 0283-0284 643 Pointer: Top of Memory for Operating
System ($A000).
TIMOUT 0285 645 Serial IEEE Bus timeout defeat Flag.
COLOR 0286 646 Current Character Colour code.
GDCOL 0287 647 Background Colour under Cursor.
HIBASE 0288 648 High Byte of Screen Memory Address ($04).
XMAX 0289 649 Maximum number of Bytes in Keyboard
Buffer ($0A).
RPTFLG 028A 650 Flag: Repeat keys; $00 = Cursors, INST/DEL &
Space repeat, $40 no Keys repeat, $80 all
Keys repeat ($00).
KOUNT 028B 651 Repeat Key: Speed Counter ($04).
DELAY 028C 652 Repeat Key: First repeat delay Counter ($10).
SHFLAG 028D 653 Flag: Shift Keys: Bit 1 = Shift, Bit 2 = CBM,
Bit 3 = CTRL; ($00 = None, $01 = Shift, etc.).
LSTSHF 028E 654 Last Shift Key used for debouncing.
KEYLOG 028F-0290 655 Vector: Routine to determine Keyboard table
to use based on Shift Key Pattern ($EB48).
MODE 0291 657 Flag: Upper/Lower Case change: $00 = Disabled,
$80 = Enabled ($00).
AUTODN 0292 658 Flag: Auto scroll down: $00 = Disabled ($00).
M51CTR 0293 659 RS232 Pseudo 6551 control Register Image.
M51CDR 0294 660 RS232 Pseudo 6551 command Register Image.
M51AJB 0295-0296 661 RS232 Non-standard Bits/Second.
RSSTAT 0297 663 RS232 Pseudo 6551 Status Register Image.
BITNUM 0298 664 RS232 Number of Bits left to send.
BAUDOF 0299-029A 665 RS232 Baud Rate; Full Bit time microseconds.
RIDBE 029B 667 RS232 Index to End of Input Buffer.
RIDBS 029C 668 RS232 Pointer: High Byte of Address of Input
Buffer.
RODBS 029D 669 RS232 Pointer: High Byte of Address of Output
Buffer.
RODBE 029E 670 RS232 Index to End of Output Buffer.
IRQTMP 029F-02A0 671 Temporary store for IRQ Vector during Tape
operations.
ENABL 02A1 673 RS232 Enables.
TODSNS 02A2 674 TOD sense during Tape I/O.
TRDTMP 02A3 675 Temporary storage during Tape READ.
TD1IRQ 02A4 676 Temporary D1IRQ Indicator during Tape READ.
TLNIDX 02A5 677 Temporary for Line Index.
TVSFLG 02A6 678 Flag: TV Standard: $00 = NTSC, $01 = PAL.
TEMP 02A7-02FF 679 Unused.
SPR11 02C0-02FE 704 Sprite #11 Data Area.
(SCREEN + $03F8 + SPR number)
POKE 1024+1016+0,11 to use Sprite#0 DATA
from ($02C0-$02FE).
IERROR 0300-0301 768 Vector: Indirect entry to BASIC Error
Message, (X) points to Message ($E38B).
IMAIN 0302-0303 770 Vector: Indirect entry to BASIC Input Line
and Decode ($A483).
ICRNCH 0304-0305 772 Vector: Indirect entry to BASIC Tokenise
Routine ($A57C).
IQPLOP 0306-0307 774 Vector: Indirect entry to BASIC LIST
Routine ($A71A).
IGONE 0308-0309 776 Vector: Indirect entry to BASIC Character
dispatch Routine ($A7E4).
IEVAL 030A-030B 778 Vector: Indirect entry to BASIC Token
evaluation ($AE86).
SAREG 030C 780 Storage for 6510 Accumulator during SYS.
SXREG 030D 781 Storage for 6510 X-Register during SYS.
SYREG 030E 782 Storage for 6510 Y-Register during SYS.
SPREG 030F 783 Storage for 6510 Status Register during SYS.
USRPOK 0310 784 USR Function JMP Instruction ($4C).
USRADD 0311-0312 785 USR Address ($LB,$MB).
TEMP 0313 787 Unused.
CINV 0314-0315 788 Vector: Hardware IRQ Interrupt Address ($EA31).
CNBINV 0316-0317 790 Vector: BRK Instruction Interrupt Address
($FE66).
NMINV 0318-0319 792 Vector: Hardware NMI Interrupt Address ($FE47).
IOPEN 031A-031B 794 Vector: Indirect entry to Kernal OPEN
Routine ($F34A).
ICLOSE 031C-031D 796 Vector: Indirect entry to Kernal CLOSE
Routine ($F291).
ICHKIN 031E-031F 798 Vector: Indirect entry to Kernal CHKIN
Routine ($F20E).
ICKOUT 0320-0321 800 Vector: Indirect entry to Kernal CHKOUT
Routine ($F250).
ICLRCH 0322-0323 802 Vector: Indirect entry to Kernal CLRCHN
Routine ($F333).
IBASIN 0324-0325 804 Vector: Indirect entry to Kernal CHRIN
Routine ($F157).
IBSOUT 0326-0327 806 Vector: Indirect entry to Kernal CHROUT
Routine ($F1CA).
ISTOP 0328-0329 808 Vector: Indirect entry to Kernal STOP
Routine ($F6ED).
IGETIN 032A-032B 810 Vector: Indirect entry to Kernal GETIN
Routine ($F13E).
ICLALL 032C-032D 812 Vector: Indirect entry to Kernal CLALL
Routine ($F32F).
USRCMD 032E-032F 814 User Defined Vector ($FE66).
ILOAD 0330-0331 816 Vector: Indirect entry to Kernal LOAD
Routine ($F4A5).
ISAVE 0332-0333 818 Vector: Indirect entry to Kernal SAVE
Routine ($F5ED).
TEMP 0334-033B 820 Unused.
TBUFFR 033C-03FB 828 Tape I/O Buffer.
SPR13 0340-037E 832 Sprite #13.
SPR14 0380-03BE 896 Sprite #14.
SPR15 03C0-03FE 960 Sprite #15.
TEMP 03FC-03FF 1020 Unused.
VICSCN 0400-07E7 1024 Default Screen Video Matrix.
TEMP 07E8-07F7 2024 Unused.
SPNTRS 07F8-07FF 2040 Default Sprite Data Pointers.
0800-9FFF 2048 Normal BASIC Program space.
8000-9FFF 32768 Optional Cartridge ROM space.
A000-BFFF 40960 BASIC ROM (Part) or 8 KB RAM.
C000-CFFF 49152 4 KB RAM.
D000-DFFF 53248 Input/Output Devices and Colour RAM or
4 KB RAM or Character ROM.
D000-D02E 53248 6566 Video Interface Chip, VIC II.
D400-D41C 54272 6581 Sound Interface Device, SID.
D500-D7FF 54528 SID Images.
D800-DBE7 55296 Colour RAM (Nybbles = 4 Bit RAM, LSB).
DBE8-DBFF 56296 Unused Nybbles.
DC00-DC0F 56320 6526 Complex Interface Adaptor, CIA.
DD00-DD0F 56576 6526 Complex Interface Adaptor, CIA.
E000-FFFF 57344 BASIC (Part)/Kernal ROM or 8 KB RAM.
E000-E4FF 57344 BASIC ROM (Part) or RAM.
E500-FFFF 58624 Kernal ROM or RAM.
COMMODORE 64 INPUT/OUTPUT ASSIGNMENTS
HEX DECIMAL BITS DESCRIPTION
0000 0 7-0 MOS 6510 Data Direction
Register (xx101111)
Bit= 1: Output, Bit=0:
Input, x=Don't Care
0001 1 MOS 6510 Micro-Processor
On-Chip I/O Port
0 /LORAM Signal (0=Switch BASIC ROM Out)
1 /HIRAM Signal (0=Switch Kernal ROM Out)
2 /CHAREN Signal (O=Swith Char. ROM In)
3 Cassette Data Output Line
4 Cassette Switch Sense: 1 = Switch Closed
5 Cassette Motor Control
O = ON, 1 = OFF
6-7 Undefined
D000-D02E 53248-54271 MOS 6566 VIDEO INTERFACE CONTROLLER (VIC)
D000 53248 Sprite 0 X Pos
D001 53249 Sprite 0 Y Pos
D002 53250 Sprite 1 X Pos
D003 53251 Sprite 1 Y Pos
D004 53252 Sprite 2 X Pos
D005 53253 Sprite 2 Y Pos
D006 53254 Sprite 3 X Pos
D007 53255 Sprite 3 Y Pos
D008 53256 Sprite 4 X Pos
D009 53257 Sprite 4 Y Pos
D00A 53258 Sprite 5 X Pos
D00B 53259 Sprite 5 Y Pos
D00C 53260 Sprite 6 X Pos
D00D 53261 Sprite 6 Y Pos
D00E 53262 Sprite 7 X Pos
D00F 53263 Sprite 7 Y Pos
D010 53264 Sprites 0-7 X Pos (msb of X coord.)
D011 53265 VIC Control Register
7 Raster Compare: (Bit 8) See 53266
6 Extended Color Text Mode 1 = Enable
5 Bit Map Mode. 1 = Enable
4 Blank Screen to Border Color: 0 = Blank
3 Select 24/25 Row Text Display: 1 = 25 Rows
2-0 Smooth Scroll to Y Dot-Position (0-7)
D012 53266 Read Raster / Write Raster Value for Compare
IRQ
D013 53267 Light-Pen Latch X Pos
D014 53268 Light-Pen Latch Y Pos
D015 53269 Sprite display Enable: 1 = Enable
D016 53270 VIC Control Register
7-6 Unused
5 ALWAYS SET THIS BIT TO 0 !
4 Multi-Color Mode: 1 = Enable (Text or
Bit-Map)
3 Select 38/40 Column Text Display: 1 = 40 Cols
2-0 Smooth Scroll to X Pos
D017 53271 Sprites O-7 Expand 2x Vertical (Y)
D018 53272 VIC Memory Control Register
7-4 Video Matrix Base Address (inside VIC)
3-1 Character Dot-Data Base Address (inside VIC)
0 Select upper/lower Character Set
D019 53273 VIC Interrupt Flag Register (Bit = 1: IRQ
Occurred)
7 Set on Any Enabled VIC IRQ Condition
3 Light-Pen Triggered IRQ Flag
2 Sprite to Sprite Collision IRQ Flag
1 Sprite to Background Collision IRQ Flag
0 Raster Compare IRQ Flag
D01A 53274 IRQ Mask Register: 1 = Interrupt Enabled
D01B 53275 Sprite to Background Display Priority:
1 = Sprite
D01C 53276 Sprites O-7 Multi-Color Mode Select:
1 = M.C.M.
D01D 53277 Sprites 0-7 Expand 2x Horizontal (X)
D01E 53278 Sprite to Sprite Collision Detect
D01F 53279 Sprite to Background Collision Detect
D020 53280 Border Color
D021 53281 Background Color 0
D022 53282 Background Color 1
D023 53283 Background Color 2
D024 53284 Background Color 3
D025 53285 Sprite Multi-Color Register 0
D026 53286 Sprite Multi-Color Register 1
D027 53287 Sprite 0 Color
D028 53288 Sprite 1 Color
D029 53289 Sprite 2 Color
D02A 53290 Sprite 3 Color
D02B 53291 Sprite 4 Color
D02C 53292 Sprite 5 Color
D02D 53293 Sprite 6 Color
D02E 53294 Sprite 7 Color
D400-D7FF 54272-55295 MOS 6581 SOUND INTERFACE DEVICE (SID)
D400 54272 Voice 1: Frequency Control - Low-Byte
D401 54273 Voice 1: Frequency Control - High-Byte
D402 54274 Voice 1: Pulse Waveform Width - Low-Byte
D403 54275 7-4 Unused
3-0 Voice 1: Pulse Waveform Width - High-Nybble
D404 54276 Voice 1: Control Register
7 Select Random Noise Waveform, 1 = On
6 Select Pulse Waveform, 1 = On
5 Select Sawtooth Waveform, 1 = On
4 Select Triangle Waveform, 1 = On
3 Test Bit: 1 = Disable Oscillator 1
2 Ring Modulate Osc. 1 with Osc. 3 Output,
1 = On
1 Synchronize Osc. 1 with Osc. 3 Frequency,
1 = On
0 Gate Bit: 1 = Start Att/Dec/Sus, 0 = Start
Release
D405 54277 Envelope Generator 1: Attack / Decay Cycle
Control
7-4 Select Attack Cycle Duration: 0-15
3-0 Select Decay Cycle Duration: 0-15
D406 54278 Envelope Generator 1: Sustain / Release Cycle
Control
7-4 Select Sustain Cycle Duration: 0-15
3-0 Select Release Cycle Duration: 0-15
D407 54279 Voice 2: Frequency Control - Low-Byte
D408 54280 Voice 2: Frequency Control - High-Byte
D409 54281 Voice 2: Pulse Waveform Width - Low-Byte
D40A 54282 7-4 Unused
3-0 Voice 2: Pulse Waveform Width - High-Nybble
D40B 54283 Voice 2: Control Register
7 Select Random Noise Waveform, 1 = On
6 Select Pulse Waveform, 1 = On
5 Select Sawtooth Waveform, 1 = On
4 Select Triangle Waveform, 1 = On
3 Test Bit: 1 = Disable Oscillator 1
2 Ring Modulate Osc. 2 with Osc. 1 Output,
1 = On
1 Synchronize Osc. 2 with Osc. 1 Frequency,
1 = On
0 Gate Bit: 1 = Start Att/Dec/Sus, 0 = Start
Release
D40C 54284 Envelope Generator 2: Attack / Decay Cycle
Control
7-4 Select Attack Cycle Duration: 0-15
3-0 Select Decay Cycle Duration: 0-15
D40D 54285 Envelope Generator 2: Sustain / Release Cycle Control
7-4 Select Sustain Cycle Duration: O-15
3-0 Select Release Cycle Duration: O-15
D40E 54286 Voice 3: Frequency Control - Low-Byte
D40F 54287 Voice 3: Frequency Control - High-Byte
D410 54288 Voice 3: Pulse Waveform Width - Low-Byte
D411 54289 7-4 Unused
3-0 Voice 3: Pulse Waveform Width - High-Nybble
D412 54290 Voice 3: Control Register
7 Select Random Noise Waveform, 1 = On
6 Select Pulse Waveform, 1 = On
5 Select Sawtooth Waveform, 1 = On
4 Select Triangle Waveform, 1 = On
3 Test Bit: 1 = Disable Oscillator 1
2 Ring Modulate Osc. 3 with Osc. 2 Output,
1 = On
1 Synchronize Osc. 3 with Osc. 2 Frequency,
1 = On
0 Gate Bit: 1 = Start Att/Dec/Sus, 0 = Start
Release
D413 54291 Envelope Generator 3: Attac/Decay Cycle Control
7-4 Select Attack Cycle Duration: 0-15
3-0 Select Decay Cycle Duration: 0-15
D414 54285 Envelope Generator 3: Sustain / Release Cycle Control
7-4 Select Sustain Cycle Duration: 0-15
3-0 Select Release Cycle Duration: 0-15
D415 54293 Filter Cutoff Frequency: Low-Nybble
(Bits 2-0)
D416 54294 Filter Cutoff Frequency: High-Byte
D417 54295 Filter Resonance Control / Voice Input
Control
7-4 Select Filter Resonance: 0-15
3 Filter External Input: 1 = Yes, 0 = No
2 Filter Voice 3 Output: 1 = Yes, 0 = No
Filter Voice 2 Output: 1 = Yes, 0 = No
0 Filter Voice 1 Output: 1 = Yes, 0 = No
D418 54296 Select Filter Mode and Volume
7 Cut-Off Voice 3 Output: 1 = Off, O = On
6 Select Filter High-Pass Mode: 1 = On
5 Select Filter Band-Pass Mode: 1 = On
4 Select Filter Low-Pass Mode: 1 = On
3-0 Select Output Volume: 0-15
D419 54297 Analog/Digital Converter: Game Paddle 1
(0-255)
D41A 54298 Analog/Digital Converter Game Paddle 2
(0-255)
D41B 54299 Oscillator 3 Random Number Generator
D41C 54230 Envelope Generator 3 Output
D500-D7FF 54528-55295 SID IMAGES
D800-DBFF 55296-56319 Color RAM (Nybbles)
DC00-DCFF 56320-56575 MOS 6526 Complex Interface Adapter (CIA) #1
DC00 56320 Data Port A (Keyboard, Joystick, Paddles,
Light-Pen)
7-0 Write Keyboard Column Values for Keyboard
Scan
7-6 Read Paddles on Port A / B (01 = Port A,
10 = Port B)
4 Joystick A Fire Button: 1 = Fire
3-2 Paddle Fire Buttons
3-0 Joystick A Direction (0-15)
DC01 56321 Data Port B (Keyboard, Joystick, Paddles):
Game Port 1
7-0 Read Keyboard Row Values for Keyboard Scan
7 Timer B Toggle/Pulse Output
6 Timer A: Toggle/Pulse Output
4 Joystick 1 Fire Button: 1 = Fire
3-2 Paddle Fire Buttons
3-0 Joystick 1 Direction
DC02 56322 Data Direction Register - Port A (56320)
DC03 56323 Data Direction Register - Port B (56321)
DC04 56324 Timer A: Low-Byte
DC05 56325 Timer A: High-Byte
DC06 56326 Timer B: Low-Byte
DC07 56327 Timer B: High-Byte
DC08 56328 Time-of-Day Clock: 1/10 Seconds
DC09 56329 Time-of-Day Clock: Seconds
DC0A 56330 Time-of-Day Clock: Minutes
DC0B 56331 Time-of-Day Clock: Hours + AM/PM Flag (Bit 7)
DC0C 56332 Synchronous Serial I/O Data Buffer
DC0D 56333 CIA Interrupt Control Register
(Read IRQs/Write Mask)
7 IRQ Flag (1 = IRQ Occurred) / Set-Clear Flag
4 FLAG1 IRQ (Cassette Read / Serial Bus SRQ
Input)
3 Serial Port Interrupt
2 Time-of-Day Clock Alarm Interrupt
1 Timer B Interrupt
0 Timer A Interrupt
DC0E 56334 CIA Control Register A
7 Time-of-Day Clock Frequency: 1 = 50 Hz,
0 = 60 Hz
6 Serial Port I/O Mode Output, 0 = Input
5 Timer A Counts: 1 = CNT Signals,
0 = System 02 Clock
4 Force Load Timer A: 1 = Yes
3 Timer A Run Mode: 1 = One-Shot,
0 = Continuous
2 Timer A Output Mode to PB6: 1 = Toggle,
0 = Pulse
1 Timer A Output on PB6: 1 = Yes, 0 = No
0 Start/Stop Timer A: 1 = Start, 0 = Stop
DC0F 56335 CIA Control Register B
7 Set Alarm/TOD-Clock: 1 = Alarm, 0 = Clock
6-5 Timer B Mode Select:
00 = Count System 02 Clock Pulses
01 = Count Positive CNT Transitions
10 = Count Timer A Underflow Pulses
11 = Count Timer A Underflows While
CNT Positive
4-0 Same as CIA Control Reg. A - for Timer B
DD00-DDFF 56576-56831 MOS 6526 Complex Interface Adapter (CIA) #2
DD00 56576 Data Port A (Serial Bus, RS-232, VIC Memory
Control)
7 Serial Bus Data Input
6 Serial Bus Clock Pulse Input
5 Serial Bus Data Output
4 Serial Bus Clock Pulse Output
3 Serial Bus ATN Signal Output
2 RS-232 Data Output (User Port)
1-0 VIC Chip System Memory Bank Select
(Default = 11)
DD01 56577 Data Port B (User Port, RS-232)
7 User / RS-232 Data Set Ready
6 User / RS-232 Clear to Send
5 User
4 User / RS-232 Carrier Detect
3 User / RS-232 Ring Indicator
2 User / RS-232 Data Terminal Ready
1 User / RS-232 Request to Send
0 User / RS-232 Received Data
DD02 56578 Data Direction Register - Port A
DD03 56579 Data Direction Register - Port B
DD04 56580 Timer A: Low-Byte
DD05 56581 Timer A: High-Byte
DD06 56582 Timer B: Low-Byte
DD07 56583 Timer B: High-Byte
DD08 56584 Time-of-Day Clock: 1/10 Seconds
DD09 56585 Time-of-Day Clock: Seconds
DD0A 56586 Time-of-Day Clock: Minutes
DD0B 56587 Time-of-Day Clock: Hours + AM/PM Flag (Bit 7)
DD0C 56588 Synchronous Serial I/O Data Buffer
DD0D 56589 CIA Interrupt Control Register (Read
NMls/Write Mask)
7 NMI Flag (1 = NMI Occurred) / Set-Clear Flag
4 FLAG1 NMI (User/RS-232 Received Data Input)
3 Serial Port Interrupt
1 Timer B Interrupt
0 Timer A Interrupt
DD0E 56590 CIA Control Register A
7 Time-of-Day Clock Frequency: 1 = 50 Hz,
0 = 60 Hz
6 Serial Port I/O Mode Output, 0 = Input
5 Timer A Counts: 1 = CNT Signals,
0 = System 02 Clock
4 Force Load Timer A: 1 = Yes
3 Timer A Run Mode: 1 = One-Shot,
0 = Continuous
2 Timer A Output Mode to PB6: 1 = Toggle,
0 = Pulse
1 Timer A Output on PB6: 1 = Yes, 0 = No
0 Start/Stop Timer A: 1 = Start, 0 = Stop
DD0F 56591 CIA Control Register B
7 Set Alarm/TOD-Clock: 1 = Alarm, 0 = Clock
6-5 Timer B Mode Select:
00 = Count System 02 Clock Pulses
01 = Count Positive CNT Transitions
10 = Count Timer A Underflow Pulses
11 = Count Timer A Underflows While
CNT Positive
4-0 Same as CIA Control Reg. A - for Timer B
DE00-DEFF 56832-57087 Reserved for Future I/O Expansion
DF00-DFFF 57088-57343 Reserved for Future I/O Expansion
*********
End of the Project 64 etext of Commodore_64_Memory_Maps.txt
*********
The Project 64 etext of Commodore_64_RAM_Memory_Map.doc
*********
; Commodore 64 RAM Memory Map
; V1.2 1 sep 1994
LABEL HEX DECIMAL
ADDRESS LOCATION DESCRIPTION
ADRAY2 0005-0006 5-6 Jump Vector: Convert Integer--Floating
CHARAC 0007 7 Search Character
ENDCHR 0008 8 Flag: Scan for Quote at End of String
TRMPOS 0009 9 Screen Column From Last TAB
VERCK 000A 10 Flag: 0 = Load, 1 = Verify
COUNT 000B 11 Input Buffer Pointer / No. of Subscripts
DIMFLG 000C 12 Flag: Default Array DiMension
VAUYP 000D 13 Data Type: $FF = String, $00 = Numeric
INTFLG 000E 14 Data Type: $80 = Integer, $00 = Floating
GARBFL 000F 15 Flag: DATA scan/LlST quote/Garbage Coll
SUBFLG 0010 16 Flag: Subscript Ref / User Function Call
INPFLG 0011 17 Flag: $00 = INPUT, $40 = GET, $98 = READ
TANSGN 0012 18 Flag TAN sign / Comparison Result
0013 19 Flag: INPUT Prompt
LINNUM 0014-0015 20-21 Temp: Integer Value
TEMPPT 0016 22 Pointer Temporary String
LASTPT 0017-0018 23-24 Last Temp String Address
TEMPST 0019-0021 25-33 Stack for Temporary Strings
INDEX 0022-002S 34-37 Utility Pointer Area
RESHO 0026-002A 38-42 Floating-Point Product of Multiply
TXTTAB 002B-002C 43-44 Pointer: Start of BASIC Text
VARTAB 002D-002E 45-46 Pointer: Start of BASIC Variables
ARYTAB 002F-0030 47-48 Pointer: Start of BASIC Arrays
STREND 0031-0032 49-50 Pointer End of BASIC Arrays (+1)
FRETOP 0033-0034 51-52 Pointer: Bottom of String Storage
FRESPC 0035-0036 53-54 Utility String Pointer
MEMSIZ 0037-0038 55-56 Pointer: Highest Address Used by BASIC
CURLIN 0039-003A 57-58 Current BASIC Line Number
OLDLIN 003B-003C 59-60 Previous BASIC Line Number
OLDTXT 003D-003E 61-62 Pointer: BASIC Statement for CONT
DATLIN 003F-0040 63-64 Current DATA Line Number
DATPTR 0041-0042 65-66 Pointer: Current DATA Item Address
INPPTR 0043-0044 67-68 Vector: INPUT Routine
VARNAM 0045-0046 69-70 Current BASIC Variable Name
VARPNT 0047-0048 71-72 Pointer: Current BASIC Variable Data
FORPNT 0049-004A 73-74 Pointer: Index Variable for FOR/NEXT
004B-0060 75-96 Temp Pointer / Data Area
FACEXP 0061 97 Floating-Point Accumulator #1: Exponent
FACHO 0062-0065 98-101 Floating Accum. #1: Mantissa
FACSGN 0066 102 Floating Accum. #1: Sign
SGNFLG 0067 103 Pointer: Series Evaluation Constant
BITS 0068 104 Floating -accum. #1: Overflow Digit
ARGEXP 0069 105 Floating-Point Accumulator #2: Exponent
ARGHO 006A-006D 106-109 Floating Accum. #2: Mantissa
ARGSGN 006E 110 Floating Accum. #2: Sign
ARISGN 006F 111 Sign Comparison Result: Accum. # 1 vs #2
FACOV 0070 112 Floating Accum. #1. Low-Order (Rounding)
FBUFPT 0071-0072 113-114 Pointer: Cassette Buffer
CHRGET 0073-008A 115-138 Subroutine: Get Next Byte of BASIC Text
CHRGOT 0079 121 Entry to Get Same Byte of Text Again
TXTPTR 007A-007B 122-123 Pointer: Current Byte of BASIC Text
RNDX 008B-008F 139-143 Floating RND Function Seed Value
STATUS 0090 144 Kernal l/O Status Word: ST
STKEY 0091 145 Flag: STOP key / RVS key
SVXT 0092 146 Timing Constant for Tape
VERCK 0093 147 Flag: 0 = Load, 1 = Verify
C3PO 0094 148 Flag: Serial Bus-Output Char. Buffered
BSOUR 0095 149 Buffered Character for Serial Bus
SYNO 0096 150 Cassette Sync No.
0097 151 Temp Data Area
LDTND 0098 152 No. of Open Files / Index to File Table
DFLTN 0099 153 Default Input Device (0)
DFLTO 009A 154 Default Output (CMD) Device (3)
PRTY 009B 155 Tape Character Parity
PSW 009C 156 Flag: Tape Byte-Received
MSGFLG 009D 157 Flag: $80 = Direct Mode, $00 = Program
PTR1 009E 158 Tape Pass 1 Error Log
PTR2 009F 159 Tape Pass 2 Error Log
TIME 00A0-00A2 160-162 Real-Time Jiffy Clock (approx) 1/60 Sec
00A3-00A4 163-164 Temp Data Area
CNTDN 00A5 165 Cassette Sync Countdown
BUFPNT 00A6 166 Pointer: Tape l/O Buffer
INBIT 00A7 167 RS-232 Input Bits / Cassette Temp
BITCI 00A8 168 RS-232 Input Bit Count / Cassette Temp
RINONE 00A9 169 RS-232 Flag: Check for Start Bit
RIDATA 00AA 170 RS-232 Input Byte Buffer/Cassette Temp
RIPRTY 00AB 171 RS-232 Input Parity / Cassette Short Cnt
SAL 00AC-00AD 172-173 Pointer: Tape Buffer/ Screen Scrolling
EAL 00AE-00AF 174-175 Tape End Addresses/End of Program
CMP0 00B0-00B1 176-177 Tape Timing Constants
TAPE1 00B2-00B3 178-179 Pointer: Start of Tape Buffer
BITTS 00B4 180 RS-232 Out Bit Count / Cassette Temp
NXTBIT 00B5 181 RS-232 Next Bit to Send/ Tape EOT Flag
RODATA 00B6 182 RS-232 Out Byte Buffer
FNLEN 00B7 183 Length of Current File Name
LA 00B8 184 Current Logical File Number
FA 00BA 186 Current Device Number
FNADR 00BB-00BC 187-188 Pointer: Current File Name
ROPRTY 00BD 189 RS-232 Out Parity / Cassette Temp
FSBLK 00BE 190 Cassette Read / Write Block Count
MYCH 00BF 191 Serial Word Buffer
CAS1 00C0 192 Tape Motor Interlock
STAL 00C1-00C2 193-194 I/O Start Address
MEMUSS 00C3-00C4 195-196 Tape Load Temps
LSTX 00C5 197 Current Key Pressed: CHR$(n) 0 = No Key
NDX 00C6 198 No. of Chars. in Keyboard Buffer (Queue)
RVS 00C7 199 Flag: Print Reverse Chars. -1=Yes, 0=No Used
INDX 00C8 200 Pointer: End of Logical Line for INPUT
LXSP 00C9-00CA 201-202 Cursor X-Y Pos. at Start of INPUT
SFDX 00CB 203 Flag: Print Shifted Chars.
BLNSW 00CC 204 Cursor Blink enable: 0 = Flash Cursor
BLNCT 00CD 205 Timer: Countdown to Toggle Cursor
GDBLN 00CE 206 Character Under Cursor
BLNON 00CF 207 Flag: Last Cursor Blink On/Off
CRSW 00D0 208 Flag: INPUT or GET from Keyboard
PNT 00D1-00D2 209-210 Pointer: Current Screen Line Address
PNTR 00D3 211 Cursor Column on Current Line
QTSW 00D4 212 Flag: Editor in Quote Mode, $00 = NO
LNMX 00D5 213 Physical Screen Line Length
TBLX 00D6 214 Current Cursor Physical Line Number
00D7 215 Temp Data Area
INSRT 00D8 216 Flag: Insert Mode, >0 = # INSTs
LDTB1 00D9-00F2 217-242 Screen Line Link Table / Editor Temps
USER 00F3-00F4 243-244 Pointer: Current Screen Color RAM loc.
KEYTAB 00F5-00F6 24S-246 Vector Keyboard Decode Table
RIBUF 00F7-00F8 247-248 RS-232 Input Buffer Pointer
ROBUF 00F9-00FA 249-250 RS-232 Output Buffer Pointer
FREKZP 00FB-00FE 251-254 Free 0-Page Space for User Programs
BASZPT 00FF 255 BASIC Temp Data Area
0100-01FF 256-511 Micro-Processor System Stack Area
0100-010A 256-266 Floating to String Work Area
BAD 0100-013E 256-318 Tape Input Error Log
BUF 0200-02S8 512-600 System INPUT Buffer
LAT 0259-0262 601-610 KERNAL Table: Active Logical File No's.
FAT 0263-026C 611-620 KERNAL Table: Device No. for Each File
SAT 026D-0276 621-630 KERNAL Table: Second Address Each File
KEYD 0277-0280 631-640 Keyboard Buffer Queue (FIFO)
MEMSTR 0281-0282 641-642 Pointer: Bottom of Memory for O.S.
MEMSIZ 0283-0284 643-644 Pointer: Top of Memory for O.S.
TIMOUT 0285 645 Flag: Kernal Variable for IEEE Timeout
COLOR 0286 646 Current Character Color Code
GDCOL 0287 647 Background Color Under Cursor
HIBASE 0288 648 Top of Screen Memory (Page)
XMAX 0289 649 Size of Keyboard Buffer
RPTFLG 028A 650 Flag: REPEAT Key Used, $80 = Repeat
KOUNT 028B 651 Repeat Speed Counter
DELAY 028C 652 Repeat Delay Counter
SHFLAG 028D 653 Flag: Keyb'rd SHIFT Key/CTRL Key/C= Key
LSTSHF 028E 654 Last Keyboard Shift Pattern
KEYLOG 028F-0290 655-656 Vector: Keyboard Table Setup
MODE 0291 657 Flag: $00=Disable SHIFT Keys, $80 = Enable
SHIFT Keys
AUTODN 0292 658 Flag: Auto Scroll Down, 0 = ON
M51CTR 0293 659 RS-232: 6551 Control Register Image
MS1CDR 0294 660 RS-232: 6551 Command Register Image
M51AJB 0295-0296 661-662 RS-232 Non-Standard BPS (Time/2-100) USA
RSSTAT 0297 663 RS-232: 6551 Status Register Image
BITNUM 0298 664 RS-232 Number of Bits Left to Send
BAUDOF 0299-029A 665-666 RS-232 Baud Rate: Full Bit Time (us)
RIDBE 029B 667 RS-232 Index to End of Input Buffer
RIDBS 029C 668 RS-232 Start of Input Buffer (Page)
RODBS 029D 669 RS-232 Start of Output Buffer (Page)
RODBE 029E 670 RS-232 Index to End of Output Buffer
IRQTMP 029F-02A0 671-672 Holds IRQ Vector During Tape I/O
ENABL 02A1 673 RS-232 Enables
02A2 674 TOD Sense During Cassette I/O
02A3 675 Temp Storage For Cassette Read
02A4 676 Temp D1 IRQ Indicator For Cassette Read
02A5 677 Temp For Line Index
02A6 678 PAL/NTSC Flag, O= NTSC, 1 = PAL
02A7-02FF 679-767 Unused
IERROR 0300-0301 768-769 Vector: Print BASIC Error Message
IMAIN 0302-0303 770-771 Vector: BASIC Warm Start
ICRNCH 0304-0305 772-773 Vector: Tokenize BASIC Text
IQPLOP 0306-0307 774-775 Vector: BASIC Text LIST
IGONE 0308-0309 776-777 Vector: BASIC Char. Dispatch
IEVAL 030A-030B 778-779 Vector: BASIC Token Evaluation
SAREG 030C 780 Storage for 6502 .A Register
SXREG 030D 781 Storage for 5502 .X Register
SYREG 030E 782 Storage for 6502 .Y Register
SPREG 030F 783 Storage for 6502 .SP Register
USRPOK 0310 784 USR Function Jump Instr (4C)
USRADD 0311-0312 785-786 USR Address Low Byte / High Byte
0313 787 Unused
CINV 0314-0315 788-789 Vector: Hardware Interrupt
CBINV 0316-0317 790-791 Vector: BRK Instr. Interrupt
NMINV 0318-0319 792-793 Vector: Non-Maskable Interrupt
IOPEN 031A-031B 794-795 KERNAL OPEN Routine Vector
ICLOSE 031C-031D 796-797 KERNAL CLOSE Routine Vector
ICHKIN 031E-031F 798-799 KERNAL CHKIN Routine
ICKOUT 0320-0321 800-801 KERNAL CHKOUT Routine
ICLRCH 0322-0323 802-803 KERNAL CLRCHN Routine Vector
IBASIN 0324-0325 804-805 KERNAL CHRIN Routine
IBSOUT 0326-0327 806-807 KERNAL CHROUT Routine
ISTOP 0328-0329 808-809 KERNAL STOP Routine Vector
IGETIN 032A-032B 810-811 KERNAL GETIN Routine
ICLALL 032C-032D 812-813 KERNAL CLALL Routine Vector
USRCMD 032E-032F 814-815 User-Defined Vector
ILOAD 0330 0331 813 817 KERNAL LOAD Routine
ISAVE 0332-0333 818-819 KERNAL SAVE Routine Vector
0334-033B 820-827 Unused
TBUFFR 033C-03FB 828-1019 Tape l/O Buffer
03FC-03FF 1020-1023 Unused
VICSCN 0400-07FF 1024-2047 1024 Byte Screen Memory Area
0400-07E7 1024-2023 Video Matrix: 25 Lines X 40 Columns
07F8-07FF 2040-2047 Sprite Data Pointers
0800-9FFF 2048-40959 Normal BASIC Program Space
8000-9FFF 32768-40959 VSP Cartridge ROM -- 8192 Bytes
A000-BFFF 40960-49151 BASIC ROM-8192 Bytes (or 8K RAM)
C000-CFFF 49152-53247 RAM-4096 Bytes
D000-DFFF 53248-57343 Input/Output Devices and
Color RAM or Character Generator ROM
or RAM-4096 Bytes
E000-FFFF 57344-65535 KERNAL ROM -- 8192 Bytes (or 8K RAM)
*********
End of the Project 64 etext of Commodore_64_RAM_Memory_Map.doc
*********
The Project 64 etext of Commodore_64_ROM_Memory_Map.doc
*********
; Commodore 64 ROM Memory Map
; V1.2 1 Sep 1994
;
; Data types in headers (for reassembler):
;
; DATA Misc data
; TEXT String terminated with 00
; WORD Vectors in LO/HI byte pairs
; CHIP I/O Area
; EMPTY ROM containing FF's or AA's
;
;
; BASIC interpreter ROM ($A000 - $BFFF)
;
a000 40960 - Restart Vectors WORD
a00c 40972 stmdsp BASIC Command Vectors WORD
a052 41042 fundsp BASIC Function Vectors WORD
a080 41088 optab BASIC Operator Vectors WORD
a09e 41118 reslst BASIC Command Keyword Table DATA
a129 41257 msclst BASIC Misc. Keyword Table DATA
a140 41280 oplist BASIC Operator Keyword Table DATA
a14d 41293 funlst BASIC Function Keyword Table DATA
a19e 41374 errtab Error Message Table DATA
a328 41768 errptr Error Message Pointers WORD
a364 41828 okk Misc. Messages TEXT
a38a 41866 fndfor Find FOR/GOSUB Entry on Stack
a3b8 41912 bltu Open Space in Memory
a3fb 41979 getstk Check Stack Depth
a408 41992 reason Check Memory Overlap
a435 42037 omerr Output ?OUT OF MEMORY Error
a437 42039 error Error Routine
a469 42089 errfin Break Entry
a474 42100 ready Restart BASIC
a480 42112 main Input & Identify BASIC Line
a49c 42140 main1 Get Line Number & Tokenise Text
a4a2 42146 inslin Insert BASIC Text
a533 42291 linkprg Rechain Lines
a560 42336 inlin Input Line Into Buffer
a579 42361 crunch Tokenise Input Buffer
a613 42515 fndlin Search for Line Number
a642 42562 scrtch Perform [new]
a65e 42590 clear Perform [clr]
a68e 42638 stxpt Reset TXTPTR
a69c 42652 list Perform [list]
a717 42775 qplop Handle LIST Character
a742 42818 for Perform [for]
a7ae 42926 newstt BASIC Warm Start
a7c4 42948 ckeol Check End of Program
a7e1 42977 gone Prepare to execute statement
a7ed 42989 gone3 Perform BASIC Keyword
a81d 43037 restor Perform [restore]
a82c 43052 stop Perform [stop], [end], break
a857 43095 cont Perform [cont]
a871 43121 run Perform [run]
a883 43139 gosub Perform [gosub]
a8a0 43168 goto Perform [goto]
a8d2 43218 return Perform [return]
a8f8 43256 data Perform [data]
a906 43270 datan Search for Next Statement / Line
a928 43304 if Perform [if]
a93b 43323 rem Perform [rem]
a94b 43339 ongoto Perform [on]
a96b 43371 linget Fetch linnum From BASIC
a9a5 43429 let Perform [let]
a9c4 43460 putint Assign Integer
a9d6 43478 ptflpt Assign Floating Point
a9d9 43481 putstr Assign String
a9e3 43491 puttim Assign TI$
aa2c 43564 getspt Add Digit to FAC#1
aa80 43648 printn Perform [print]#
aa86 43654 cmd Perform [cmd]
aa9a 43674 strdon Print String From Memory
aaa0 43680 print Perform [print]
aab8 43704 varop Output Variable
aad7 43735 crdo Output CR/LF
aae8 43752 comprt Handle comma, TAB(, SPC(
ab1e 43806 strout Output String
ab3b 43835 outspc Output Format Character
ab4d 43853 doagin Handle Bad Data
ab7b 43899 get Perform [get]
aba5 43941 inputn Perform [input#]
abbf 43967 input Perform [input]
abea 44010 bufful Read Input Buffer
abf9 44025 qinlin Do Input Prompt
ac06 44038 read Perform [read]
ac35 44085 rdget General Purpose Read Routine
acfc 44284 exint Input Error Messages TEXT
ad1e 44318 next Perform [next]
ad61 44385 donext Check Valid Loop
ad8a 44426 frmnum Confirm Result
ad9e 44446 frmevl Evaluate Expression in Text
ae83 44675 eval Evaluate Single Term
aea8 44712 pival Constant - pi DATA
aead 44717 qdot Continue Expression
aef1 44785 parchk Expression in Brackets
aef7 44791 chkcls Confirm Character
aef7 44791 - -test ')'-
aefa 44794 - -test '('-
aefd 44797 - -test comma-
af08 44808 synerr Output ?SYNTAX Error
af0d 44813 domin Set up NOT Function
af14 44820 rsvvar Identify Reserved Variable
af28 44840 isvar Search for Variable
af48 44872 tisasc Convert TI to ASCII String
afa7 44967 isfun Identify Function Type
afb1 44977 strfun Evaluate String Function
afd1 45009 numfun Evaluate Numeric Function
afe6 45030 orop Perform [or], [and]
b016 45078 dorel Perform <, =, >
b01b 45083 numrel Numeric Comparison
b02e 45102 strrel String Comparison
b07e 45182 dim Perform [dim]
b08b 45195 ptrget Identify Variable
b0e7 45287 ordvar Locate Ordinary Variable
b11d 45341 notfns Create New Variable
b128 45352 notevl Create Variable
b194 45460 aryget Allocate Array Pointer Space
b1a5 45477 n32768 Constant 32768 in Flpt DATA
b1aa 45482 facinx FAC#1 to Integer in (AC/YR)
b1b2 45490 intidx Evaluate Text for Integer
b1bf 45503 ayint FAC#1 to Positive Integer
b1d1 45521 isary Get Array Parameters
b218 45592 fndary Find Array
b245 45637 bserr ?BAD SUBSCRIPT/?ILLEGAL QUANTITY
b261 45665 notfdd Create Array
b30e 45838 inlpn2 Locate Element in Array
b34c 45900 umult Number of Bytes in Subscript
b37d 45949 fre Perform [fre]
b391 45969 givayf Convert Integer in (AC/YR) to Flpt
b39e 45982 pos Perform [pos]
b3a6 45990 errdir Confirm Program Mode
b3e1 46049 getfnm Check Syntax of FN
b3f4 46068 fndoer Perform [fn]
b465 46181 strd Perform [str$]
b487 46215 strlit Set Up String
b4d5 46293 putnw1 Save String Descriptor
b4f4 46324 getspa Allocate Space for String
b526 46374 garbag Garbage Collection
b5bd 46525 dvars Search for Next String
b606 46598 grbpas Collect a String
b63d 46653 cat Concatenate Two Strings
b67a 46714 movins Store String in High RAM
b6a3 46755 frestr Perform String Housekeeping
b6db 46811 frefac Clean Descriptor Stack
b6ec 46828 chrd Perform [chr$]
b700 46848 leftd Perform [left$]
b72c 46892 rightd Perform [right$]
b737 46903 midd Perform [mid$]
b761 46945 pream Pull sTring Parameters
b77c 46972 len Perform [len]
b782 46978 len1 Exit String Mode
b78b 46987 asc Perform [asc]
b79b 47003 gtbytc Evaluate Text to 1 Byte in XR
b7ad 47021 val Perform [val]
b7b5 47029 strval Convert ASCII String to Flpt
b7eb 47083 getnum Get parameters for POKE/WAIT
b7f7 47095 getadr Convert FAC#1 to Integer in LINNUM
b80d 47117 peek Perform [peek]
b824 47140 poke Perform [poke]
b82d 47149 wait Perform [wait]
b849 47177 faddh Add 0.5 to FAC#1
b850 47184 fsub Perform Subtraction
b862 47202 fadd5 Normalise Addition
b867 47207 fadd Perform Addition
b947 47431 negfac 2's Complement FAC#1
b97e 47486 overr Output ?OVERFLOW Error
b983 47491 mulshf Multiply by Zero Byte
b9bc 47548 fone Table of Flpt Constants DATA
b9ea 47594 log Perform [log]
ba28 47656 fmult Perform Multiply
ba59 47705 mulply Multiply by a Byte
ba8c 47756 conupk Load FAC#2 From Memory
bab7 47799 muldiv Test Both Accumulators
bad4 47828 mldvex Overflow / Underflow
bae2 47842 mul10 Multiply FAC#1 by 10
baf9 47865 tenc Constant 10 in Flpt DATA
bafe 47870 div10 Divide FAC#1 by 10
bb07 47879 fdiv Divide FAC#2 by Flpt at (AC/YR)
bb0f 47887 fdivt Divide FAC#2 by FAC#1
bba2 48034 movfm Load FAC#1 From Memory
bbc7 48071 mov2f Store FAC#1 in Memory
bbfc 48124 movfa Copy FAC#2 into FAC#1
bc0c 48140 movaf Copy FAC#1 into FAC#2
bc1b 48155 round Round FAC#1
bc2b 48171 sign Check Sign of FAC#1
bc39 48185 sgn Perform [sgn]
bc58 48216 abs Perform [abs]
bc5b 48219 fcomp Compare FAC#1 With Memory
bc9b 48283 qint Convert FAC#1 to Integer
bccc 48332 int Perform [int]
bcf3 48371 fin Convert ASCII String to a Number in FAC#1
bdb3 48563 n0999 String Conversion Constants DATA
bdc2 48578 inprt Output 'IN' and Line Number
bddd 48605 fout Convert FAC#1 to ASCII String
be68 48744 foutim Convert TI to String
bf11 48913 fhalf Table of Constants DATA
bf71 49009 sqr Perform [sqr]
bf7b 49019 fpwrt Perform power ($)
bfb4 49076 negop Negate FAC#1
bfbf 49087 logeb2 Table of Constants DATA
bfed 49133 exp Perform [exp]
;
;
; C64 Kernal ROM
;
e000 57344 (exp continues) EXP continued From BASIC ROM
e043 57411 polyx Series Evaluation
e08d 57485 rmulc Constants for RND DATA
e097 57495 rnd Perform [rnd]
e0f9 57593 bioerr Handle I/O Error in BASIC
e10c 57612 bchout Output Character
e112 57618 bchin Input Character
e118 57624 bckout Set Up For Output
e11e 57630 bckin Set Up For Input
e124 57636 bgetin Get One Character
e12a 57642 sys Perform [sys]
e156 57686 savet Perform [save]
e165 57701 verfyt Perform [verify / load]
e1be 57790 opent Perform [open]
e1c7 57799 closet Perform [close]
e1d4 57812 slpara Get Parameters For LOAD/SAVE
e200 57856 combyt Get Next One Byte Parameter
e206 57862 deflt Check Default Parameters
e20e 57870 cmmerr Check For Comma
e219 57881 ocpara Get Parameters For OPEN/CLOSE
e264 57956 cos Perform [cos]
e26b 57963 sin Perform [sin]
e2b4 58036 tan Perform [tan]
e2e0 58080 pi2 Table of Trig Constants DATA
;e2e0 1.570796327 pi/2
;e2e5 6.28318531 pi*2
;e2ea 0.25
;e2ef #05 (counter)
;e2f0 -14.3813907
;e2f5 42.0077971
;e2fa -76.7041703
;e2ff 81.6052237
;e304 -41.3417021
;e309 6.28318531
e30e 58126 atn Perform [atn]
e33e 58174 atncon Table of ATN Constants DATA
;e33e #0b (counter)
;e3ef -0.000684793912
;e344 0.00485094216
;e349 -0.161117018
;e34e 0.034209638
;e353 -0.0542791328
;e358 0.0724571965
;e35d -0.0898023954
;e362 0.110932413
;e367 -0.142839808
;e36c 0.19999912
;e371 -0.333333316
;e376 1.00
e37b 58235 bassft BASIC Warm Start [RUNSTOP-RESTORE]
e394 58260 init BASIC Cold Start
e3a2 58274 initat CHRGET For Zero-page
e3ba 58298 rndsed RND Seed For zero-page DATA
;e3b2 0.811635157
e3bf 58303 initcz Initialize BASIC RAM
e422 58402 initms Output Power-Up Message
e447 58439 bvtrs Table of BASIC Vectors (for 0300) WORD
e453 58451 initv Initialize Vectors
e45f 58463 words Power-Up Message DATA
e4ad 58541 - Patch for BASIC Call to CHKOUT
e4b7 58551 - Unused Bytes For Future Patches EMPTY
e4da 58586 - Reset Character Colour
e4e0 58592 - Pause After Finding Tape File
e4ec 58604 - RS-232 Timing Table -- PAL DATA
e500 58624 iobase Get I/O Address
e505 58629 screen Get Screen Size
e50a 58634 plot Put / Get Row And Column
e518 58648 cint1 Initialize I/O
e544 58692 - Clear Screen
e566 58726 - Home Cursor
e56c 58732 - Set Screen Pointers
e59a 58778 - Set I/O Defaults (Unused Entry)
e5a0 58784 - Set I/O Defaults
e5b4 58804 lp2 Get Character From Keyboard Buffer
e5ca 58826 - Input From Keyboard
e632 58930 - Input From Screen or Keyboard
e684 59012 - Quotes Test
e691 59025 - Set Up Screen Print
e6b6 59062 - Advance Cursor
e6ed 59117 - Retreat Cursor
e701 59137 - Back on to Previous Line
e716 59158 - Output to Screen
e72a 59178 - -unshifted characters-
e7d4 59348 - -shifted characters-
e87c 59516 - Go to Next Line
e891 59537 - Output <CR>
e8a1 59553 - Check Line Decrement
e8b3 59571 - Check Line Increment
e8cb 59595 - Set Colour Code
e8da 59610 - Colour Code Table
e8ea 59626 - Scroll Screen
e965 59749 - Open A Space On The Screen
e9c8 59848 - Move A Screen Line
e9e0 59872 - Syncronise Colour Transfer
e9f0 59888 - Set Start of Line
e9ff 59903 - Clear Screen Line
ea13 59923 - Print To Screen
ea24 59940 - Syncronise Colour Pointer
ea31 59953 - Main IRQ Entry Point
ea87 60039 scnkey Scan Keyboard
eadd 60125 - Process Key Image
eb79 60281 - Pointers to Keyboard decoding tables WORD
eb81 60289 - Keyboard 1 -- unshifted DATA
ebc2 60354 - Keyboard 2 -- Shifted DATA
ec03 60419 - Keyboard 3 -- Commodore DATA
ec44 60484 - Graphics/Text Control
ec78 60536 - Keyboard 4 -- Control DATA
ecb9 60601 - Video Chip Setup Table DATA
ece7 60647 - Shift-Run Equivalent
ecf0 60656 - Low Byte Screen Line Addresses DATA
ed09 60681 talk Send TALK Command on Serial Bus
ed0c 60684 listn Send LISTEN Command on Serial Bus
ed40 60736 - Send Data On Serial Bus
edad 60845 - Flag Errors
edad 60845 - Status #80 - device not present
edb0 60848 - Status #03 - write timeout
edb9 60857 second Send LISTEN Secondary Address
edbe 60862 - Clear ATN
edc7 60871 tksa Send TALK Secondary Address
edcc 60876 - Wait For Clock
eddd 60893 ciout Send Serial Deferred
edef 60911 untlk Send UNTALK / UNLISTEN
ee13 60947 acptr Receive From Serial Bus
ee85 61061 - Serial Clock On
ee8e 61070 - Serial Clock Off
ee97 61079 - Serial Output 1
eea0 61088 - Serial Output 0
eea9 61097 - Get Serial Data And Clock In
eeb3 61107 - Delay 1 ms
eebb 61115 - RS-232 Send
ef06 61190 - Send New RS-232 Byte
ef2e 61230 - 'No DSR' / 'No CTS' Error
ef39 61241 - Disable Timer
ef4a 61258 - Compute Bit Count
ef59 61273 - RS-232 Receive
ef7e 61310 - Set Up To Receive
ef90 61328 - Process RS-232 Byte
efe1 61409 - Submit to RS-232
f00d 61453 - No DSR (Data Set Ready) Error
f017 61463 - Send to RS-232 Buffer
f04d 61517 - Input From RS-232
f086 61574 - Get From RS-232
f0a4 61604 - Serial Bus Idle
f0bd 61629 - Table of Kernal I/O Messages DATA
f12b 61739 - Print Message if Direct
f12f 61743 - Print Message
f13e 61758 getin Get a byte
f157 61783 chrin Input a byte
f199 61849 - Get From Tape / Serial / RS-232
f1ca 61898 chrout Output One Character
f20e 61966 chkin Set Input Device
f250 62032 chkout Set Output Device
f291 62097 close Close File
f30f 62223 - Find File
f31f 62239 - Set File values
f32f 62255 clall Abort All Files
f333 62259 clrchn Restore Default I/O
f34a 62282 open Open File
f3d5 62421 - Send Secondary Address
f409 62473 - Open RS-232
f49e 62622 load Load RAM
f4b8 62648 - Load File From Serial Bus
f533 62771 - Load File From Tape
f5af 62927 - Print "SEARCHING"
f5c1 62913 - Print Filename
f5d2 62930 - Print "LOADING / VERIFYING"
f5dd 62941 save Save RAM
f5fa 62970 - Save to Serial Bus
f659 63065 - Save to Tape
f68f 63119 - Print "SAVING"
f69b 63131 udtim Bump Clock
f6dd 63197 rdtim Get Time
f6e4 63204 settim Set Time
f6ed 63213 stop Check STOP Key
f6fb 63227 - Output I/O Error Messages
f6fb 63227 - 'too many files'
f6fe 63230 - 'file open'
f701 63233 - 'file not open'
f704 63236 - 'file not found'
f707 63239 - 'device not present'
f70a 63242 - 'not input file'
f70d 63245 - 'not output file'
f710 63248 - 'missing filename'
f713 63251 - 'illegal device number'
f72d 63277 - Find Any Tape Header
f76a 63338 - Write Tape Header
f7d0 63440 - Get Buffer Address
f7d7 63447 - Set Buffer Stat / End Pointers
f7ea 63466 - Find Specific Tape Header
f80d 63501 - Bump Tape Pointer
f817 63511 - Print "PRESS PLAY ON TAPE"
f82e 63534 - Check Tape Status
f838 63544 - Print "PRESS RECORD..."
f841 63553 - Initiate Tape Read
f864 63588 - Initiate Tape Write
f875 63605 - Common Tape Code
f8d0 63696 - Check Tape Stop
f8e2 63714 - Set Read Timing
f92c 63788 - Read Tape Bits
fa60 64096 - Store Tape Characters
fb8e 64398 - Reset Tape Pointer
fb97 64407 - New Character Setup
fba6 64422 - Send Tone to Tape
fbc8 64456 - Write Data to Tape
fbcd 64461 - IRQ Entry Point
fc57 64599 - Write Tape Leader
fc93 64659 - Restore Normal IRQ
fcb8 64696 - Set IRQ Vector
fcca 64714 - Kill Tape Motor
fcd1 64721 - Check Read / Write Pointer
fcdb 64731 - Bump Read / Write Pointer
fce2 64738 - Power-Up RESET Entry
fd02 64770 - Check For 8-ROM
fd12 64786 - 8-ROM Mask '80CBM' DATA
fd15 64789 restor Restore Kernal Vectors (at 0314)
fd1a 64794 vector Change Vectors For User
fd30 64816 - Kernal Reset Vectors WORD
fd50 64848 ramtas Initialise System Constants
fd9b 64923 - IRQ Vectors For Tape I/O WORD
fda3 64931 ioinit Initialise I/O
fddd 64989 - Enable Timer
fdf9 65017 setnam Set Filename
fe00 65024 setlfs Set Logical File Parameters
fe07 65031 readst Get I/O Status Word
fe18 65048 setmsg Control OS Messages
fe21 65057 settmo Set IEEE Timeout
fe25 65061 memtop Read / Set Top of Memory
fe34 65076 membot Read / Set Bottom of Memory
fe43 65091 - NMI Transfer Entry
fe66 65126 - Warm Start Basic [BRK]
febc 65212 - Exit Interrupt
fec2 65218 - RS-232 Timing Table - NTSC DATA
fed6 65238 - NMI RS-232 In
ff07 65287 - NMI RS-232 Out
ff43 65347 - Fake IRQ Entry
ff48 65352 - IRQ Entry
ff5b 65371 cint Initialize screen editor
ff80 65408 - Kernal Version Number [03] DATA
;
; C64 Kernal Jump Table
;
ff81 jmp $ff5b cint Init Editor & Video Chips
ff84 jmp $fd23 ioinit Init I/O Devices, Ports & Timers
ff87 jmp $fd50 ramtas Init Ram & Buffers
ff8a jmp $fd15 restor Restore Vectors
ff8d jmp $fd1a vector Change Vectors For User
ff90 jmp $fe18 setmsg Control OS Messages
ff93 jmp $edb9 secnd Send SA After Listen
ff96 jmp $edc7 tksa Send SA After Talk
ff99 jmp $fe25 memtop Set/Read System RAM Top
ff9c jmp $fe34 membot Set/Read System RAM Bottom
ff9f jmp $ea87 scnkey Scan Keyboard
ffa2 jmp $fe21 settmo Set Timeout In IEEE
ffa5 jmp $ee13 acptr Handshake Serial Byte In
ffa8 jmp $eddd ciout Handshake Serial Byte Out
ffab jmp $edef untalk Command Serial Bus UNTALK
ffae jmp $edfe unlsn Command Serial Bus UNLISTEN
ffb1 jmp $ed0c listn Command Serial Bus LISTEN
ffb4 jmp $ed09 talk Command Serial Bus TALK
ffb7 jmp $fe07 readss Read I/O Status Word
ffba jmp $fe00 setlfs Set Logical File Parameters
ffbd jmp $fdf9 setnam Set Filename
ffc0 jmp ($031a) (iopen) Open Vector [f34a]
ffc3 jmp ($031c) (iclose) Close Vector [f291]
ffc6 jmp ($031e) (ichkin) Set Input [f20e]
ffc9 jmp ($0320) (ichkout) Set Output [f250]
ffcc jmp ($0322) (iclrch) Restore I/O Vector [f333]
ffcf jmp ($0324) (ichrin) Input Vector, chrin [f157]
ffd2 jmp ($0326) (ichrout) Output Vector, chrout [f1ca]
ffd5 jmp $f49e load Load RAM From Device
ffd8 jmp $f5dd save Save RAM To Device
ffdb jmp $f6e4 settim Set Real-Time Clock
ffde jmp $f6dd rdtim Read Real-Time Clock
ffe1 jmp ($0328) (istop) Test-Stop Vector [f6ed]
ffe4 jmp ($032a) (igetin) Get From Keyboad [f13e]
ffe7 jmp ($032c) (iclall) Close All Channels And Files [f32f]
ffea jmp $f69b udtim Increment Real-Time Clock
ffed jmp $e505 screen Return Screen Organization
fff0 jmp $e50a plot Read / Set Cursor X/Y Position
fff3 jmp $e500 iobase Return I/O Base Address
;fff6 Vectors
fff6 [5252] -
fff8 [5942] SYSTEM
;fffa Transfer Vectors
fffa [fe43] NMI
fffc [fce2] RESET
fffe [ff48] IRQ
*********
End of the Project 64 etext of Commodore_64_ROM_Memory_Map.doc
*********
The Project 64 etext of Commodore_64_ROM_Memory_Map.txt
*********
; ---<C64rom.lib>---
;
; Commodore 64 ROM Memory Map
;
; BASIC interpreter ROM ($A000 - $BFFF)
;
; label address type comments
restart = $a000
stmdsp = $a00c
fundsp = $a052
optab = $a080
reslst = $a09e
msclst = $a129
oplist = $a140
funlst = $a14d
errtab = $a19e
errptr = $a328
okk = $a364
fndfor = $a38a
bltu = $a3b8
getstk = $a3fb
reason = $a408
omerr = $a435
error = $a437
errfin = $a469
ready = $a474
main = $a480
main1 = $a49c
inslin = $a4a2
linkprg = $a533
inlin = $a560
crunch = $a579
fndlin = $a613
scrtch = $a642
clear = $a65e
stxpt = $a68e
list = $a69c
qplop = $a717
for = $a742
newstt = $a7ae
ckeol = $a7c4
gone = $a7e1
gone3 = $a7ed
restor = $a81d
stop = $a82c
cont = $a857
run = $a871
gosub = $a883
goto = $a8a0
return = $a8d2
data = $a8f8
datan = $a906
if = $a928
rem = $a93b
ongoto = $a94b
linget = $a96b
let = $a9a5
putint = $a9c4
ptflpt = $a9d6
putstr = $a9d9
puttim = $a9e3
getspt = $aa2c
printn = $aa80
cmd = $aa86
strdon = $aa9a
print = $aaa0
varop = $aab8
crdo = $aad7
comprt = $aae8
strout = $ab1e
outspc = $ab3b
doagin = $ab4d
get = $ab7b
inputn = $aba5
input = $abbf
bufful = $abea
qinlin = $abf9
read = $ac06
rdget = $ac35
exint = $acfc
next = $ad1e
donext = $ad61
frmnum = $ad8a
frmevl = $ad9e
eval = $ae83
pival = $aea8
qdot = $aead
parchk = $aef1
chkcls = $aef7
synerr = $af08
domin = $af0d
rsvvar = $af14
isvar = $af28
tisasc = $af48
isfun = $afa7
strfun = $afb1
numfun = $afd1
orop = $afe6
dorel = $b016
numrel = $b01b
strrel = $b02e
dim = $b07e
ptrget = $b08b
ordvar = $b0e7
isletc = $b113
notfns = $b11d
notevl = $b128
aryget = $b194
n32768 = $b1a5 data
facinx = $b1aa
intidx = $b1b2
ayint = $b1bf
isary = $b1d1
fndary = $b218
bserr = $b245
notfdd = $b261
inlpn2 = $b30e
umult = $b34c
fre = $b37d
givayf = $b391
pos = $b39e
errdir = $b3a6
def = $b3b3
getfnm = $b3e1
fndoer = $b3f4
strd = $b465
strlit = $b487
putnw1 = $b4d5
getspa = $b4f4
garbag = $b526
dvars = $b5bd
grbpas = $b606
cat = $b63d
movins = $b67a
frestr = $b6a3
frefac = $b6db
chrd = $b6ec
leftd = $b700
rightd = $b72c
midd = $b737
pream = $b761
len = $b77c
len1 = $b782
asc = $b78b
gtbytc = $b79b
val = $b7ad
strval = $b7b5
getnum = $b7eb
getadr = $b7f7
peek = $b80d
poke = $b824
wait = $b82d
faddh = $b849
fsub = $b850
fadd5 = $b862
fadd = $b867
negfac = $b947
overr = $b97e
mulshf = $b983
fone = $b9bc data
log = $b9ea
fmult = $ba28
mulply = $ba59
conupk = $ba8c
muldiv = $bab7
mldvex = $bad4
mul10 = $bae2
tenc = $baf9 data
div10 = $bafe
fdiv = $bb07
fdivt = $bb0f
movfm = $bba2
mov2f = $bbc7
movfa = $bbfc
movaf = $bc0c
round = $bc1b
sign = $bc2b
sgn = $bc39
abs = $bc58
fcomp = $bc5b
qint = $bc9b
int = $bccc
fin = $bcf3
n0999 = $bdb3 data
inprt = $bdc2
fout = $bddd
foutim = $be68
fhalf = $bf11 data
sqr = $bf71
fpwrt = $bf7b
negop = $bfb4
logeb2 = $bfbf data
exp = $bfed
;
;
; C64 KERNEL ROM
;
(exp = $e000
polyx = $e043
rmulc = $e08d data
rnd = $e097
bioerr = $e0f9
bchout = $e10c
bchin = $e112
bckout = $e118
bckin = $e11e
bgetin = $e124
sys = $e12a
savet = $e156
verfyt = $e165
opent = $e1be
closet = $e1c7
slpara = $e1d4
combyt = $e200
deflt = $e206
cmmerr = $e20e
ocpara = $e219
cos = $e264
sin = $e26b
tan = $e2b4
pi2 = $e2e0 data
atn = $e30e
atncon = $e33e data
bassft = $e37b
init = $e394
initat = $e3a2
rndsed = $e3ba
initcz = $e3bf
initms = $e422
bvtrs = $e447 data
initv = $e453
words = $e45f
- = $e4ad
- = $e4b7 illegal
- = $e4da
- = $e4e0
- = $e4ec data
iobase = $e500
screen = $e505
plot = $e50a
cint1 = $e518
- = $e544
- = $e566
- = $e56c
= ;
- = $e59a
lp2 = $e5b4
- = $e5ca
- = $e632
- = $e684
- = $e691
- = $e6b6
- = $e6ed
- = $e701
- = $e716
- = $e87c
- = $e891
- = $e8a1
- = $eacb
- = $e8da
- = $e8ea
- = $e965
- = $e9c8
- = $e9e0
- = $e9f0
- = $e9ff
- = $ea13
- = $ea24
- = $ea31
scnkey = $ea87
- = $eadd data
- = $eb79 data
- = $eb81 data
- = $ebc2 data
- = $ec03
- = $ec44 data
- = $ec78 data
- = $ecb9
- = $ece7 data
- = $ecf0
talk = $ed09
- = $ed40
- = $edad
second = $edb9
- = $edbe
tksa = $edc7
- = $edcc
ciout = $eddd
untlk = $edef
acptr = $ee13
- = $ee85
- = $ee8e
- = $ee97
- = $eea0
- = $eea9
- = $eeb3
- = $eebb
- = $ef06
- = $ef2e
- = $ef39
- = $ef4a
- = $ef59
- = $ef7e
- = $ef90
- = $efe1
- = $f00d
- = $f017
- = $f04d
- = $f086
- = $f0a4
- = $f0bd
- = $f128
getin = $f13e
chrin = $f157
- = $f199
chrout = $f1ca
chkin = $f20e
chkout = $f250
close = $f291
- = $f30f
- = $f31f
clall = $f32f
clrchn = $f333
open = $f34a
- = $f3d5
- = $f409
load = $f49e
;
;--------------
;
save = $f5dd
udtim = $f69b
rdtim = $f6dd
settim = $f6e4
stop = $f6ed
restor = $fd15
vector = $fd1a
ramtas = $fd50
ioinit = $fda3
setnam = $fdf9
setlfs = $fe00
readst = $fe07
setmsg = $fe18
settmo = $fe21
memtop = $fe25
membot = $fe34
cint = $fe58
;
;
; C64 KERNEL call addresses
;
acptr = $ffa5
chkin = $ffc6
chkout = $ffc9
chrin = $ffcf
chrout = $ffd2
ciout = $ffa8
cint = $ff81
clall = $ffe7
close = $ffc3
clrchn = $ffcc
getin = $ffe4
iobase = $fff3
ioinit = $ff84
listen = $ffb1
load = $ffd5
membot = $ff9c
memtop = $ff99
open = $ffc0
plot = $fff0
ramtas = $ff87
rdtim = $ffde
readst = $ffb7
restor = $ff8a
save = $ffd8
scnkey = $ff9f
screen = $ffed
second = $ff93
setlfs = $ffba
setmsg = $ff90
setnam = $ffbd
settim = $ffdb
settmo = $ffa2
stop = $ffe1
talk = $ffb4
tksa = $ff96
udtim = $ffea
unlsn = $ffae
untlk = $ffab
vector = $ff8d
;
*********
End of the Project 64 etext of Commodore_64_ROM_Memory_Map.txt
*********
End of the Project 64 etext 64MAP10.TXT, several Commodore 64 memory
maps.
*********
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