$DF93/57235:   Get buffer number

DF93: A6 82     LDX $82
DF95: B5 A7     LDA $A7,X
DF97: 10 02     BPL $DF9B
DF99: B5 AE     LDA $AE,X
DF9B: 29 BF     AND #$BF
DF9D: 60        RTS

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