$FF20/65312:   Patch for listen to serial bus, from $E9DC

Jump from $FF25, $E9DC:

FF20: AD 00 18  LDA $1800
FF23: 29 01     AND #$01
FF25: D0 F9     BNE $FF20
FF27: A9 01     LDA #$01
FF29: 8D 05 18  STA $1805
FF2C: 4C DF E9  JMP $E9DF

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