$C38F/50063:   Reverse drive number

Jump from $C40E, $C420, $C427, $C467, $C497, $C704, $C70B:

C38F: A5 7F     LDA $7F         ; drive number
C391: 49 01     EOR #$01        ; switch bit 0
C393: 29 01     AND #$01
C395: 85 7F     STA $7F
C397: 60        RTS

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