[Coco] Re: Orchestra 90 - S/S Pak

[tim lindner]

James Diffendaffer <jdiffendaffer at yahoo.com> wrote:

> BTW, does anyone have a dump of the ROM from the S/SP?

The S/SC doesn't have a ROM in the CoCo's address space. The CoCo
communicates with a microcontroller (GI PIC7040 [A relabeled TMS7040])
that is in charge of the PSG, SP0256 (speech chip) and 2K of RAM.

The microcontroller does have an interal ROM, but it is not accessiable
from the CoCo. The SP0256 also has a ROM, but it's instruction set is
only concerened with manipulating a 12 pole sound generation circuit.

A friend of mine did manage to dump the ROM inside the PIC7040. I wrote
about it here:

http://home.netcom.com/~tlindner/SSCInternals.html

I also have a nearly complete S/SC implemention for the CoCo driver in
MESS. I just have to write a SP0256 core. MAME already contains an
SP0250 core but that device only has the 12 pole sound generation
hardware. It doesn't contain the micro-micro-controller and ROM used in
the SP0256.

-- 
tim lindner
tlindner at macmess.org                                              Bright