     $C100/49408:   Turn LED on for current drive

    Jump from $C38C, $C439, $C46A, $C49A, $CE0B, $CFA2, $D39E, $D7E1, $EE1D:

    C100: 78        SEI
    C101: A9 F7     LDA #$F7        ; erase LED bit
    C103: 2D 00 1C  AND $1C00
    C106: 48        PHA
    C107: A5 7F     LDA $7F         ; drive number
    C109: F0 05     BEQ $C110       ; 0?
    C10B: 68        PLA
    C10C: 09 00     ORA #$00        ; not drive 0, turn LED off
    C10E: D0 03     BNE $C113

    Jump from $C109:

    C110: 68        PLA
    C111: 09 08     ORA #$08        ; turn LED on

    Jump from $C10E:

    C113: 8D 00 1C  STA $1C00
    C116: 58        CLI
    C117: 60        RTS

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