[Coco] Question re: Cart slot decode

[Steven Hirsch]

On Mon, 2 Feb 2009, Stephen Castello wrote:

> On Mon, 2 Feb 2009 18:47:31 -0500 (EST), Steven Hirsch
> <snhirsch at gmail.com> had a flock of green cheek conures squawk out:
>
>> I'm looking for a definitive answer on whether accesses between ff60-ff7e
>> are supposed to be decoded by the Multi-Pak and/or slot cartridges.
>>
>> All the docs seem to indicate that the SCS region is ff40-ff5f and the
>> control register for the MP is at ff7f.  So, who owns the in-between
>> addresses?
>>
>> I have a set of PAL equations for the older (large) MP that suggest it
>> listens to the entire ff40-ff7f range, but it would be good to get a
>> second opinion :-).
>>
>> From a 2001 email.  The list doesn't have everything that was made for
> the Coco.

> FF60 \                  FF60 X position of pen
> :     >   X-pad         FF61 Y position of pen
> FF63 /                  FF62 Z pos/pressure of pen
>                        FF63 ???
>
> FF68 \
>      >   RS-232 pak 6551
> FF6B /
>
> FF6C \
> :     >   Modem Pak 6551 ACIA
> FF6F /
>
> FF70 > alternate address of LR-Tech SASI controller
> FF74 > default address of LR-Tech SASI controller
>
> FF70 \
> :     > IDE controller alternate address
> FF78 /
>
> FF7D \
> :     >   Speech/Sound pak  FF7E speech chip register
> FF7E /
>
> FF7F  >   Multi-Pak interface slot control switch (0=0,17=1,34=2,51=3)
>
> FF74 \
> :     >   Disto SCII haltless controller additional addresses
> FF77 /
>
> FF7A \                          FF7A left channel d/a
> :     >   Orchestra 90-CC Pak   FF7B right channel d/a
> FF7B /


I guess that settles it.  There's a considerable quantity of erroneous 
information out there, as I read about four different resources that claim 
the SCS range is ff40-ff5f.

Thanks!

Steve


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