[Coco] Cartridges that use SCS decoding

[Zippster]

I think it’s for reads only with “F” board CoCo 1’s and later.

I don’t think it applies to earlier machines, except perhaps if retrofitted to 64K.

Look at a CoCo2 schematic.

- Ed



> On Mar 9, 2017, at 11:17 AM, Mark J. Blair <nf6x at nf6x.net> wrote:
> 
> 
>> On Mar 9, 2017, at 08:59, Zippster <zippster278 at gmail.com> wrote:
>> 
>> 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.
> 
> In the schematic diagram in the back of my TRS-80 Color Computer Technical Reference Manual (the green book), I see the logic which gates CTS* with E. But I don't see anything gating CTS with R/W*. I thought that I had previously performed an experiment and satisfied myself that CTS* was active for both reads and writes, but I should do that again. Does the CTS* logic vary between different CoCo models?
> 
> -- 
> Mark J. Blair, NF6X <nf6x at nf6x.net>
> http://www.nf6x.net/
> 
> 
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