[Coco] SCS Line (or others?) - Atmega Microcontroller monitoring

[Darren A]

On Sat, Oct 17, 2015 at 7:01 PM, Chad H wrote:

> P.S.  I'm observing already that several of my ROM/BIN games seem to be
> triggering the SCS a lot while running.  I thought it might be games that
> use joysticks but Color Baseball doesn't trigger any SCS events, neither
> does 8-Ball.   I was already going to have my controller ignore SCS events
> except for when it's loading .BIN segments, so this won't be a problem.
> Just curious is all.
>
> games already seen to trigger the SCS line include..
>
> Atom (Still don't know how to play this one) - my SCS trigger increment
> counter is going slow and steady on this one.
> Downland - Its running pretty fast on this one.
>



You should not rely on SCS alone. It should be gated with the E clock and
only recognized as a valid access when SCS is low and E is high.  False
triggers of SCS can occur while E is low and the address bus is
transitioning.

- Darren