[Coco] Cartridges that use SCS decoding

[Zippster]

CTS would be active as far as the SAM goes for reads & writes.  Additional logic
on the CoCo motherboard allows it to be active only when R/*W and E are both high.

Looks like you’re right though, the range should be to $FEFF.  Not sure why I had it only to $DFFF in my notes.

- Ed


> On Mar 9, 2017, at 10:48 AM, Phill Harvey-Smith <afra at ramoth.org.uk> wrote:
> 
> On 09/03/2017 16:36, tim lindner wrote:
>> Ed, you are correct. I mis-typed. It's the SCS signal I am interested in.
>> 
>> I mean to create a list of SCS devices, and non-SCS devices.
> 
> The Dragon DOS cart uses SCS (or P2 as the Dragon docs call it) for it's IO decode, and CTS for ROM.
> 
> I also thought that CTS was active for $C000-$FEFF, and is according to the SAM data sheet, it's also active for writes too again from SAM data sheet.
> 
> This is of course all moot if the cartridge where to pull SLENB / DSD low then it can map things pretty much anywhere it likes.
> 
> Cheers.
> 
> Phill.
> 
> 
> -- 
> Coco mailing list
> Coco at maltedmedia.com
> https://pairlist5.pair.net/mailman/listinfo/coco