$FF01/65281:   U9 vector, switch 1540/1541

FF01: AD 02 02  LDA $0202
FF04: C9 2D     CMP #$2D
FF06: F0 05     BEQ $FF0D
FF08: 38        SEC
FF09: E9 2B     SBC #$2B
FF0B: D0 DA     BNE $FEE7
FF0D: 85 23     STA $23
FF0F: 60        RTS

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