[Coco] Question re: Cart slot decode

[Gene Heskett]

On Monday 02 February 2009, Roger Taylor wrote:

>At 07:16 PM 2/2/2009, you wrote:

>>On Mon, 2 Feb 2009, Darren A wrote:

>>>>On Mon, 2 Feb 2009, Stephen Castello wrote:

>>>>

>>>>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.

>>>

>>>---

>>>

>>>Settles what?

>>>

>>>The SCS range is FF40 - FF5F.

>>

>>I was confusing myself.  I understand now that the SCS range is

>>FF40-FF5F, but all accesses between FF40-FF7F will enable the bus

>>transceiver on the MPI and allow data flow back and forth. (As will

>>assertion of CTS* and/or SLENB*).

>>

>>Wrong terminology on my part.  The fact that other types of hardware

>>sit above FF5F is orthogonal to the fact of where the SCS are lies.

>>

>>I'm still learning the CC3.  If this were an Apple 2, I'd have this

>>level of detail engraved on the inside of my eyelids :-).

>>

>>Steve

>

>Can't a pak also just decode directly from the address lines?  Aren't

>the SCS and CTS signals just shortcut decoders and also annoying in

>that they ghost the addresses?


Yes it can Roger.  AFAIK, all packs out of the SCS range do a full decode 
internally.


-- 
Cheers, Gene
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