     $EF59/61273:   RS-232 Receive

    Jump from $FF04:

    EF59: A6 A9     LDX $A9
    EF5B: D0 33     BNE $EF90
    EF5D: C6 A8     DEC $A8
    EF5F: F0 36     BEQ $EF97
    EF61: 30 0D     BMI $EF70
    EF63: A5 A7     LDA $A7
    EF65: 45 AB     EOR $AB
    EF67: 85 AB     STA $AB
    EF69: 46 A7     LSR $A7
    EF6B: 66 AA     ROR $AA

    Jump from $EF7C, $EFBA, $EFC2, $EFC5:

    EF6D: 60        RTS

    Jump from $EFB8:

    EF6E: C6 A8     DEC $A8

    Jump from $EF61:

    EF70: A5 A7     LDA $A7
    EF72: F0 67     BEQ $EFDB
    EF74: AD 93 02  LDA $0293
    EF77: 0A        ASL
    EF78: A9 01     LDA #$01
    EF7A: 65 A8     ADC $A8
    EF7C: D0 EF     BNE $EF6D

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