On Tuesday 23 January 2001 19:06, you wrote:
> Laurens Holst wrote:
> > > And, please, don't forget SCC+. =)
> >
> > Of which there are 2 different versions...
There is only one SCC+, but it was used in two different cartridges (Snatcher
and SD Snatcher).
> You could theoretically emulate one "generic"
> SCC+ which is compatible with both Snatcher
> and SD Snatcher. I remember this could be
> done in a real SCC+ cartridge by cutting
> (or shorting?) some address lines. Is that
> true?
It's true. The difference is in the location of the RAM. In Snatcher, the RAM
is located in pages 0-7 and in SD Snatcher the RAM is located in pages 8-F.
The best way to make them compatible is to expand the RAM to 128K (adding 2
DRAM ICs, there is room for that on the print). But it's also possible to
mess with the address lines to create a mirroring effect on the 64K that is
originally in there.
Read more about it on this page:
http://www.msxnet.org/tech/SoundCartridge.html
Bye,
Maarten
--
For info, see http://www.stack.nl/~wynke/MSX/listinfo.html
