YM2203

Techokami · Dec 13, 2006

Yes, which would explain the sudden awarding of a green square to him. =)

Snake · Dec 13, 2006

Aurochs said:

Near as I can gather though, the SSG-EG envelope area in the 2203 is a subset of the 2149's register array. It's four bytes shorter than the 2149, but if you give a direct correspondence ($90 - $00, $9F - $0F), the registers they supposedly cut out from the YM2203 make no sense whatsoever.

EDIT: HOLD UP, ABOVE MAY BE INACCURATE

The YM2149's register array is mapped onto the YM2203's $00-$0F. This is probably for compatability with the SSG. Perhaps both regions control the SSG-EG? Someone with real hardware and a flashcart/SMD will have to check it out.
Click to expand...

I can clear that up for you.

The 2203 has TWO SSG-EG sections. $00-$0F is register compatible with a YM2149 and performs the same functions. So, basically, the 2203 has three FM channels, PLUS 3 YM2149 channels and a noise generator. This part does not exist in the YM2612.

The other SSG-EG section is for the FM channels, and it's function is to enable SSG type envelope control upon the FM channels. That's the part mapped to $90+. This is present in the YM2612 but doesn't always perform exactly as it should.

Aurochs · Dec 13, 2006

Yeah, that's what I suspected, but the 2203 datasheet didn't give me enough info to tell.

I was pretty sure that the 2612 didn't have $00-$0F though since it doesn't have the whole I/O bus thing.

Vangar · Dec 13, 2006

Off-topic again I know and I'm sorry, but I'd just like to say thanks for your emulator and that I'm a fan of your work.

Not sure if anyone asked you this before, but has Sega or any representatives asked you to do something new recently for them?

Stealth · Dec 14, 2006

Tweaker said:

Sith said:

Quickman said:

There are numerous instances of inadequacy, from inaccurately rendering the colours actually used by the Megadrive...
Click to expand...

A MegaDrive was designed to display its picture on a TV and not a monitor.

Hook up your PC to a CRT tv running Fusion and have another look. :P
Click to expand...

Genecyst seems to get the colors spot on, though...

This is what I've been told, anyway... LOst mentioned it a good fair few times.
Click to expand...

Genecyst is for DOS, which gets direct hardware access, and so can set it's colors exactly. Windows/DirectX/Some windows video card drivers have some wierd brightness "correction" settings that alter the colors it's programs want to display

Vangar · Dec 14, 2006

I wonder if there is a way to turn that off, but I've never heard of that before either.

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