$F0DF/61663:   ?

Jump from $C7BA, $EF3E, $F05D:

F0DF: B5 A7     LDA $A7,X
F0E1: C9 FF     CMP #$FF
F0E3: D0 25     BNE $F10A
F0E5: 8A        TXA
F0E6: 48        PHA
F0E7: 20 8E D2  JSR $D28E
F0EA: AA        TAX
F0EB: 10 05     BPL $F0F2
F0ED: A9 70     LDA #$70
F0EF: 20 C8 C1  JSR $C1C8       ; 70, 'no channel'

Jump from $F0EB:

F0F2: 86 F9     STX $F9
F0F4: 68        PLA
F0F5: A8        TAY
F0F6: 8A        TXA
F0F7: 09 80     ORA #$80
F0F9: 99 A7 00  STA $A7,Y
F0FC: 0A        ASL
F0FD: AA        TAX
F0FE: AD 85 FE  LDA $FE85       ; 18, directory track
F101: 95 06     STA $06,X       ; save
F103: A9 00     LDA #$00        ; 0
F105: 95 07     STA $07,X       ; as sector
F107: 4C 86 D5  JMP $D586       ; write block

Jump from $F0E3:

F10A: 29 0F     AND #$0F
F10C: 85 F9     STA $F9         ; buffer number
F10E: 60        RTS

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