[Coco] [Color Computer] Keyboard Rollover differences between coco2 and coco1 and 3s

[jim_gerrie]

Can someone tell me why the keyboard rollover table starting as 338 resets to 255 when no keys are pressed on coco1 and 3s, but not on coco 2s?  Is there some other means (peek) for knowing if a key is being pressed or not?  How does continuous key input get done on a coco 2 in basic without having to poke all the keyboard rollover locations with 255s, or is that the only way?