     $FA63/64099:   ?

    Jump from $FA30:

    FA63: C6 4A     DEC $4A         ; step counter for head transport
    FA65: AE 00 1C  LDX $1C00
    FA68: E8        INX

    Jump from $FA38:

    FA69: 8A        TXA
    FA6A: 29 03     AND #$03
    FA6C: 85 4B     STA $4B
    FA6E: AD 00 1C  LDA $1C00
    FA71: 29 FC     AND #$FC
    FA73: 05 4B     ORA $4B         ; stepper motor off
    FA75: 8D 00 1C  STA $1C00
    FA78: 4C BE FA  JMP $FABE

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