question about PC-Engine Super Grafx System

[MottZilla]

It's too bad the SGX didn't get more use. Though I'm guessing it was rather expensive. But if you threw that into the DUO it would have made for a nice combo. I think I recall a thread where someone said that Street Fighter II' one character's graphical animations took up around 128K. Well with the SGX and Super CD-ROM format you might have been able to pull it off since the SGX brings up the work RAM to 64K. And in general the added RAM could have helped with HuCards and using compression since you have a bigger buffer to decompress to. I wonder if any of the SGX titles utilized the extra RAM to use compression to fit more into those HuCards.

It would be fun to see a homemade SGX DUO. I bet it could be done.

[Necromancer]

Really?  I thought is had the same soundchip and the only only real hardware difference was the doubling of RAM and graphics chip.  Or do you mean better by built-in stereo (no booster required)?

From Tom:

There's an audio upgrade (revision 6280A) in one of the CoreGrafx models over the original PCE. I believe it's the CoreGrafx model 1 because it came out about the same time as the SGX (which has the upgraded revision).

.........

There's popping on the corresponding channel's DAC when volume is adjusted. It's relative to the size of the adjustment, but it can get pretty loud/noticeable if the change is large (in either direction, including turning 'off' the channel). So the revision cpu fixes this (since the audio chip is included in the same package as the cpu) and gives a little smoother audio.