$C3BD/50109:   Check given drive number

C3BD: C9 30     CMP #$30
C3BF: F0 06     BEQ $C3C7
C3C1: C9 31     CMP #$31
C3C3: F0 02     BEQ $C3C7
C3C5: 09 80     ORA #$80
C3C7: 29 81     AND #$81
C3C9: 60        RTS

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