$F0A4/61604:   Serial Bus Idle

Jump from $ED0E, $F88A:

F0A4: 48        PHA
F0A5: AD A1 02  LDA $02A1     ; RS232 Enables
F0A8: F0 11     BEQ $F0BB

Jump from $F0AF:

F0AA: AD A1 02  LDA $02A1     ; RS232 Enables
F0AD: 29 03     AND #$03
F0AF: D0 F9     BNE $F0AA
F0B1: A9 10     LDA #$10
F0B3: 8D 0D DD  STA $DD0D     ; CIA2: Interrupt (NMI) Control Register
F0B6: A9 00     LDA #$00
F0B8: 8D A1 02  STA $02A1     ; RS232 Enables

Jump from $F0A8:

F0BB: 68        PLA
F0BC: 60        RTS

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