[Coco] 86-87 GIME chip detect challenge

[Robert Gault]

Nick Marentes wrote:
> Later down the track with my new CoCo3 game, I'll have a need to be able to
> detect which of the 2 versions of GIME chip is in the CoCo3, '86 or '87.
>
> Here's a challenge for someone to come up with a simple, compact way to
> detect for this without user intervention.
>
> Can anyone help?
>
> Nick
>
>

Based on the information given by John Kowalski
http://users.axess.com/twilight/sock/gime.html
the GIME timers work slightly differently for the '86 vs '87 chips. I can't 
verify this but presumably you could store a number in the $FF94-$FF95 timer, 
count cycles, and determine which chip is present.

Problem is that John reports the difference as nnn+2 verse nnn+1 which would be 
a very small difference making the precision iffy.

Robert