[Coco] [Color Computer] CoCo Key Press routine

[Kevin Zee]

Take a peek in Color Basic Unravelled... You can check out the keyboard 
routine - it is at 0xA1C1...

Alan wrote:
>
> Hi All,
>
> Can someone tell me how to read a key from the keyboard on a Coco in
> 6809 assembly language, without using ROM routines? I know I can call a
> routine at $ADFB and it will wait for a keypress. How can I do the same
> exact thing without calling a ROM routine? I know it has something to
> do with scanning the PIA input lines. Any help would be appreciated!
>
>