6 ; If open_apple key is pressed then the high-bit of the key is set.
15 bpl _cgetc ; if < 128, no key pressed
17 ; At this time, the high bit of the key pressed is set
18 bit KBDSTRB ; clear keyboard strobe
20 bit BUTN0 ; check if OpenApple is down
23 and #$7F ; If not down, then clear high bit