     $FA1C/64028:   Calculate number of head steps

    Jump from $FA10:

    FA1C: E5 5E     SBC $5E
    FA1E: E5 5E     SBC $5E
    FA20: 85 61     STA $61
    FA22: A5 5E     LDA $5E
    FA24: 85 60     STA $60
    FA26: A9 7B     LDA #$7B
    FA28: 85 62     STA $62
    FA2A: A9 FA     LDA #$FA        ; pointer $62/$63 to $FA7B
    FA2C: 85 63     STA $63

    Jump from $F9C8, $FA1A, $FA3D, $FA94:

    FA2E: A5 4A     LDA $4A         ; step counter for head transport
    FA30: 10 31     BPL $FA63
    FA32: E6 4A     INC $4A         ; increment
    FA34: AE 00 1C  LDX $1C00
    FA37: CA        DEX
    FA38: 4C 69 FA  JMP $FA69

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