[Coco] Cartridges that use SCS decoding

[Zippster]

I have an excel file with some of this information already gathered.

I’ll email it to you.

- Ed


> On Mar 9, 2017, at 10:36 AM, tim lindner <tlindner at macmess.org> 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.
> 
> 
> 
> On Thu, Mar 9, 2017 at 8:32 AM, Zippster <zippster278 at gmail.com> wrote:
>> Hi Tim,
>> 
>> To the best of my knowledge…
>> 
>> *CTS is active only for reads made to the 8K space $C000-$DFFF.  So it
>> won’t be used for decoding on any address that requires writes.
>> 
>> You will probably find it is used on every (or nearly every) device that contains an
>> on-board ROM.  For instance, it is used as the chip enable signal on the ROM
>> chip for the Orchestra 90.
>> 
>> *SCS is active for both reads and writes to $FF40-$FF5F, and will be the main
>> arbitration signal for IO (other than ROM reads) when one is used.
>> 
>> Most items (outside of those *CTS ROM reads) don’t use an arbitration signal,
>> and do their own decoding in the $FF60-$FF8F range. The RS-232 PAK is one of
>> these, according to my info, using $FF68-$FF6B.
>> 
>> - Ed
>> 
>> 
>> 
>> 
>> 
>>> On Mar 9, 2017, at 8:57 AM, tim lindner <tlindner at macmess.org> wrote:
>>> 
>>> I'd like to get a list of CoCo cartridges that use CTS address
>>> decoding, and those that do not.
>>> 
>>> So far I have:
>>> 
>>> Carts that use CTS:
>>> Floppy disk controller
>>> 
>>> Carts that do their own address decoding:
>>> Orch-90
>>> Speech / Sound Cartridge
>>> 
>>> Where does the RS-232 cart fit on this list?
>>> 
>>> What about other carts?
>>> 
>>> 
>>> --
>>> --
>>> tim lindner
>>> 
>>> "Proper User Policy apparently means Simon Says."
>>> 
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>> 
>> 
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> 
> 
> 
> -- 
> --
> tim lindner
> 
> "Proper User Policy apparently means Simon Says."
> 
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