     $C3BD/50109:   Check given drive number

    Jump from $C372, $DA68:

    C3BD: C9 30     CMP #$30        ; '0'
    C3BF: F0 06     BEQ $C3C7
    C3C1: C9 31     CMP #$31        ; '1'
    C3C3: F0 02     BEQ $C3C7
    C3C5: 09 80     ORA #$80        ; no zero or one, then set bit 7

    Jump from $C3BF, $C3C3:

    C3C7: 29 81     AND #$81
    C3C9: 60        RTS

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