$EA59/59993:   Test for ATN

EA59: A5 7D     LDA $7D
EA5B: F0 06     BEQ $EA63
EA5D: AD 00 18  LDA $1800
EA60: 10 09     BPL $EA6B
EA62: 60        RTS
EA63: AD 00 18  LDA $1800
EA66: 10 FA     BPL $EA62
EA68: 4C 5B E8  JMP $E85B
EA6B: 4C D7 E8  JMP $E8D7

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