6 ;; If open_apple key is pressed then the high-bit of the
15 bpl _cgetc ; if < 128, no key pressed
16 ;; At this time, the high bit of the key pressed
18 sta CLEAR_KEY_STROBE; clear keyboard strobe
19 bit OPEN_APPLE ; check if OpenApple is down
21 and #$7F ; If not down, then clear high bit