     $EF90/61328:   Process RS-232 Byte

    Jump from $EF5B:

    EF90: A5 A7     LDA $A7
    EF92: D0 EA     BNE $EF7E
    EF94: 4C D3 E4  JMP $E4D3               ; STA $A9
                                            ; RTS on old KERNAL!

    Jump from $EF5F:

    EF97: AC 9B 02  LDY $029B
    EF9A: C8        INY
    EF9B: CC 9C 02  CPY $029C
    EF9E: F0 2A     BEQ $EFCA
    EFA0: 8C 9B 02  STY $029B
    EFA3: 88        DEY
    EFA4: A5 AA     LDA $AA
    EFA6: AE 98 02  LDX $0298

    Jump from $EFAF:

    EFA9: E0 09     CPX #$09
    EFAB: F0 04     BEQ $EFB1
    EFAD: 4A        LSR
    EFAE: E8        INX
    EFAF: D0 F8     BNE $EFA9

    Jump from $EFAB:

    EFB1: 91 F7     STA ($F7),Y
    EFB3: A9 20     LDA #$20
    EFB5: 2C 94 02  BIT $0294
    EFB8: F0 B4     BEQ $EF6E
    EFBA: 30 B1     BMI $EF6D
    EFBC: A5 A7     LDA $A7
    EFBE: 45 AB     EOR $AB
    EFC0: F0 03     BEQ $EFC5
    EFC2: 70 A9     BVS $EF6D
    EFC4: 2C        .BYTE $2C

    Jump from $EFC0:

    EFC5: 50 A6     BVC $EF6D
    EFC7: A9 01     LDA #$01
    EFC9: 2C        .BYTE $2C

    Jump from $EF9E:

    EFCA: A9 04     LDA #$04
    EFCC: 2C        .BYTE $2C

    Jump from $EFDF:

    EFCD: A9 80     LDA #$80
    EFCF: 2C        .BYTE $2C

    Jump from $EFDD:

    EFD0: A9 02     LDA #$02
    EFD2: 0D 97 02  ORA $0297
    EFD5: 8D 97 02  STA $0297
    EFD8: 4C 7E EF  JMP $EF7E

    Jump from $EF72:

    EFDB: A5 AA     LDA $AA
    EFDD: D0 F1     BNE $EFD0
    EFDF: F0 EC     BEQ $EFCD

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