$C33C/49980:   Search for drive number

C33C: AA        TAX
C33D: A0 00     LDY #$00
C33F: A9 3A     LDA #$3A
C341: DD 01 02  CMP $0201,X
C344: F0 0C     BEQ $C352
C346: DD 00 02  CMP $0200,X
C349: D0 16     BNE $C361
C34B: E8        INX
C34C: 98        TYA
C34D: 29 01     AND #$01
C34F: A8        TAY
C350: 8A        TXA
C351: 60        RTS
C352: BD 00 02  LDA $0200,X
C355: E8        INX
C356: E8        INX
C357: C9 30     CMP #$30
C359: F0 F2     BEQ $C34D
C35B: C9 31     CMP #$31
C35D: F0 EE     BEQ $C34D
C35F: D0 EB     BNE $C34C
C361: 98        TYA
C362: 09 80     ORA #$80
C364: 29 81     AND #$81
C366: D0 E7     BNE $C34F

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