1541/1571 40/42 Pin Gate Arrays
Parallel/Serial Data Conversion
R/W Control Logic
Stepper Motor Control
Spindle Motor On/Off Driver (325572)
CPU Control (251828)
64H105 64H156
325572-01 251828-01(251828-02)
1541/1541A/SX-64 1541B/1541C/1541-II/1571
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Vcc | 1 40 | B TEST | 1 40(42) |-BYTE
-B | 2 39 |-BYTE YB0 | 2 39(41) | SOE
-Q | 3 38 | SOE YB1 | 3 38(40) | B
Q | 4 37 |-SYNC YB2 | 4 37(39) | CK
-MTR | 5 36 | OE YB3 | 5 36(38) |-XQ
-A | 6 35 | YB7 YB4 | 6 35(37) | Q
| 7 34 | YB6 YB5 | 7 34(36) | R/W
MTR | 8 33 | YB6 | 8 33(35) | LOCK
| 9 32 | YB5 YB7 | 9 32(34) | PLL
STP0 | 10 31 | YB4 VSS | 10 31(33) | CLR
| 11 30 | YB3 STP1 | 11 30(32) | VCC
STP1 | 12 29 | YB2 STP0 | 12 29(31) |-XRW
| 13 28 | MTR | 13 28(30) | Y3
| 14 27 | YB1 -A | 14 27(29) | Y2
Y3 | 15 26 | YB0 DS0 | 15 26(28) | Y1
Y2 | 16 25 | Q-OUT DS1 | 16 25(27) | Y0
Y1 | 17 24 | D-IN -SYNC | 17 24(26) | ATN
Y0 | 18 23 | CLK-IN TED | 18 23(25) | ATNI
CLK | 19 22 | LOAD OE | 19 22(24) | ATNA
Vss | 20 21 | CLR -ACCL | 20 21(23) | OSC
|_____________| Vcc | (21) (22) | Vss
|_____________|
1541B/1541C/1571 20 Pin Gate Array
64H157
251829-01
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Similar to PLS159 | |_| |
Address Selector OSC | 1 20 |-RAME
Saddle Canceller SYNC | 2 19 |-IO1
Motor Speed Compensator (PLL) DATA | 3 18 |-IO2
TEST | 4 17 |-CS1
Vss | 5 16 |-CS2
A15 | 6 15 | Vcc
A14 | 7 14 |-ROME
A13 | 8 13 | LOCK
A12 | 9 12 | PLL
A10 | 10 11 | CLR
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