$EF3A/61242: Set buffer pointer for BAM
Jump from $D075, $EF0C, $F005:
EF3A: 20 0F F1 JSR $F10F ; get 6 for drive 0
EF3D: AA TAX
EF3E: 20 DF F0 JSR $F0DF ; allocate buffer
EF41: A6 F9 LDX $F9 ; buffer number
EF43: BD E0 FE LDA $FEE0,X ; buffer address, hi byte
EF46: 85 6E STA $6E
EF48: A9 00 LDA #$00 ; lo byte
EF4A: 85 6D STA $6D ; pointer to $6D/$6E
EF4C: 60 RTS
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