Routines
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F8D0: scan stop key and flag abort if pressed
Used by the routines at F817 and F875.
F8D0 20 E1 FF JSR $FFE1 scan stop key
F8D3 18 CLC flag no stop
F8D4 D0 0B BNE $F8E1 exit if no stop
F8D6 20 93 FC JSR $FC93 restore everything for STOP
F8D9 38 SEC flag stopped
F8DA 68 PLA dump return address low byte
F8DB 68 PLA dump return address high byte
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