[Coco] C and BASIC09 (Auto-discard notification)

[Robert Gault]

James Jones wrote:
 ><snip>
> Hmmm. Hasn't someone already written the moral equivalent of INKEY$ that 
> one can run as if it were a BASIC09 procedure? If not, you can roll your 
> own. The BASIC09 docs describe the parameter passing conventions, and 
> you'll want to do the I$GetStat that asks whether there's pending data 
> on an SCF path. If there isn't, then you want to return some value to 
> indicate that; if there is, then of course you I$Read a byte and return 
> that.
> 
> James Jones
> 

It would be easy if the original request had been use asm or C within 
Basic09 but it was for the opposite; use Basic09 within C. To complicate 
things further, the requester wants to trap two/three key presses and 
control keys.