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F6ED: scan the stop key
return Zb = 1 = [STOP]
F6ED A5 91 LDA $91 read the stop key column
F6EF C9 7F CMP #$7F compare with [STP] down
F6F1 D0 07 BNE $F6FA if not [STP] or not just [STP] exit
just [STP] was pressed
F6F3 08 PHP save status
F6F4 20 CC FF JSR $FFCC close input and output channels
F6F7 85 C6 STA $C6 save the keyboard buffer index
F6F9 28 PLP restore status
F6FA 60 RTS
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