$F6ED/63213:   Check STOP Key

F6ED: A5 91     LDA $91       ; Flag: $7F = STOP key
F6EF: C9 7F     CMP #$7F
F6F1: D0 07     BNE $F6FA
F6F3: 08        PHP
F6F4: 20 CC FF  JSR $FFCC     ; Restore I/O Vector
F6F7: 85 C6     STA $C6       ; Number of Characters in Keyboard Buffer queue
F6F9: 28        PLP

Jump from $F6F1:

F6FA: 60        RTS

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