$D1D3/53715:   Get drive number

D1D3: 20 93 DF  JSR $DF93
D1D6: AA        TAX
D1D7: BD 5B 02  LDA $025B,X
D1DA: 29 01     AND #$01
D1DC: 85 7F     STA $7F
D1DE: 60        RTS

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