$F5E9/62953: Calculate parity for data buffer
Jump from $F4FB, $F575, $F698, $FCA2:
F5E9: A9 00 LDA #$00
F5EB: A8 TAY
Jump from $F5EF:
F5EC: 51 30 EOR ($30),Y
F5EE: C8 INY
F5EF: D0 FB BNE $F5EC
F5F1: 60 RTS
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