$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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