$C312/49938:   Preserve drive number

C312: AD 78 02  LDA $0278
C315: 8D 77 02  STA $0277
C318: A9 01     LDA #$01
C31A: 8D 78 02  STA $0278
C31D: 8D 79 02  STA $0279
C320: AC 8E 02  LDY $028E
C323: A2 00     LDX #$00
C325: 86 D3     STX $D3
C327: BD 7A 02  LDA $027A,X
C32A: 20 3C C3  JSR $C33C
C32D: A6 D3     LDX $D3
C32F: 9D 7A 02  STA $027A,X
C332: 98        TYA
C333: 95 E2     STA $E2,X
C335: E8        INX
C336: EC 78 02  CPX $0278
C339: 90 EA     BCC $C325
C33B: 60        RTS

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