SpritesMind.Net

Updating envelope generator (just the attenuation level) on key-on has completely fixed the spiderman problem for me :) . It decrease the attenuation level which then results in the correct sound. Although I don't know if its correct or not. Well, an envelope generator update should definitely occu...

Here's my description of the phase generator. I'm pretty sure this is everything you need to get a 100% accurate implementation of the phase generator, with the exception of phase modulation by the LFO. I'll cover LFO phase and amplitude modulation in a full description of the low frequency oscillat...

I'm pretty sure V2.21 of the Sega CD-X bios is dumped, which is the US version of the Multi-Mega, but I think the Multi-Mega bios itself hasn't been dumped, or at least, I haven't come across it, and it doesn't seem to be listed in goodgen. There are of course alternate versions too though. My MegaC...

The sound issue in the first level of Separation Anxiety seems to be a self-feedback related issue, or at least it has similar symptoms to track 3 in Mega Turrican. I don't think it's related to detune. I'll be carrying out some tests to try and isolate this problem, and track down the cause. The ti...

Nice. Sounds easier than dumping bios files from a CD then. I always had to do a full 4MB dump from 0x0 and compare the mirrored copies to figure out which one was good. I should probably post some of the unreleased dumps I've got. A few of my bioses like the one for my Multi-Mega are undumped versi...

Which range are you dumping the BIOS from out of curiosity? I found when I was dumping my BIOS files, if I dumped from the base range where the BIOS was mapped, something was masking some of the interrupt vectors from the vector table at the start of the ROM. I could only get a "clean" dump of the b...

I've found a bit of a glitch when changing between fullscreen mode and windowed. If you have the Regen window as a floating window (not maximized) and you change to fullscreen mode, then back again, everything works fine. If you have the Regen window maximized however, then you change to fullscreen ...

Awesome. That means everyone can implement CSM support and say they have more accurate YM2612 emulation than Kega.

Well, I can't answer the questions about self-feedback yet. I haven't started doing any serious testing of self-feedback, but when I do, I'll definitely investigate these issues and see if I can track down the cause. I can post a lot of info about other aspects of the operator unit however. They sho...

Ahh, I hadn't looked into the algorithm implementation in MAME. The MEM storage in MAME has nothing to do with what I was just talking about. They've implemented this MEM storage as something which actually holds over the output of a particular operator for each channel between samples. In MAME, por...

It's clear that the operator unit does have an internal temporary storage location which can hold the output of at least one operator. There's actually no way to verify what the operator unit stores from any tests on the system, but you can determine a lot from just looking at the way the algorithms...

I've got both the J-Cart and non J-Cart versions of Micro Machines 2. Would it help if I dump the EEPROM from both carts?

Well, the YM2612 is on the Z80 bus. In order for the M68000 to access it, the request has to be forwarded onto the Z80 bus by the bus arbiter. This will result in slower access than simply accessing a device on the M68000 bus. I'm not sure how much slower, but at the very least it would be an extra ...

Hmm. Close, but not quite. Looks like I'm too slow by around 5.2%. It's all down to timing. I overclocked the M68000 in my emulator by a factor of 10, and the thing ran at what sounded like full speed. Remember that an overflow could be triggered a fraction of a second after you test the YM2612 stat...

....and now I feel like I'm derailing Aamir's thread. Sorry. When someone mentiones debugging, I just can't help but talk about it. I still get a stupid ass grin on my face every time I use a breakpoint.