     $EA59/59993:   Test for ATN

    Jump from $E916, $E925, $E937, $E941, $E94E, $E987, $E9CD, $E9DF, $E9FD,
              $EA1A:

    EA59: A5 7D     LDA $7D         ; EOI received?
    EA5B: F0 06     BEQ $EA63       ; yes
    EA5D: AD 00 18  LDA $1800       ; IEEE port
    EA60: 10 09     BPL $EA6B

    Jump from $EA66:

    EA62: 60        RTS

    Jump from $EA5B:

    EA63: AD 00 18  LDA $1800       ; IEEE port
    EA66: 10 FA     BPL $EA62
    EA68: 4C 5B E8  JMP $E85B       ; to serial bus main loop

    Jump from $EA60:

    EA6B: 4C D7 E8  JMP $E8D7       ; set EOI, serial bus

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