[Coco] Cartridges that use CTS decoding

[Zippster]

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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