     $F99C/63900:   Job loop disk controller

    Jump from $F2E6, $F2F0, $F2F6, $F31D, $F48A, $FAF2, $FAFD, $FD93, $FDD8:

    F99C: AD 07 1C  LDA $1C07
    F99F: 8D 05 1C  STA $1C05
    F9A2: AD 00 1C  LDA $1C00
    F9A5: 29 10     AND #$10        ; write protect?
    F9A7: C5 1E     CMP $1E
    F9A9: 85 1E     STA $1E
    F9AB: F0 04     BEQ $F9B1
    F9AD: A9 01     LDA #$01
    F9AF: 85 1C     STA $1C

    Jump from $F9AB:

    F9B1: AD FE 02  LDA $02FE
    F9B4: F0 15     BEQ $F9CB
    F9B6: C9 02     CMP #$02
    F9B8: D0 07     BNE $F9C1
    F9BA: A9 00     LDA #$00
    F9BC: 8D FE 02  STA $02FE
    F9BF: F0 0A     BEQ $F9CB

    Jump from $F9B8:

    F9C1: 85 4A     STA $4A
    F9C3: A9 02     LDA #$02
    F9C5: 8D FE 02  STA $02FE
    F9C8: 4C 2E FA  JMP $FA2E

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