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Looking at the disassembly here , it looks like you could carefully capture the microseconds that it reads the "SEGA" from the header, and assert /VRES at that moment to bypass TMSS. Following up on this: I quickly tried something that would tap /VRES low for the requisite 10 cycles (per the 68k da...

www.Mortoffgames.com is selling my DIY snes pcb. Usually the progression of pcb makers is to go from simple to complex. My experience was just the opposite. I made/make the RetroCircuits pcb's and the "simple save" series has all smt parts machine mounted which is complex (and expensive), and is rea...

I don't know how the extra signals on the Genesis cart bus compare to the signals straight out of the 68k itself, but in a bare 68k, the address bus is marked as stable by the /AS signal being low. I assume that the bus arbiter doesn't assert any of the relevant signals (B16, B17, B21, B26) unless ...

Hello, Its been some time since i've wanted to do this, but was unsure if posting Sega stuff in NesDev would be acceptable. I've talked to B00daW about it and he said that it would not be a problem. This is already posted in Racketboy and i though that it would be fair to share here as much of the ...

It appears that your sram is actually an 8k ram and your jumpers are set for 32k. Maybe that’s the issue??

I really believe your issues are all related to cross talk. I think if you isolate and ground plane those traces, you should be good. I think the LS series chips help with noise, it’s been a looong time since I researched those so I could be wrong, but I think the SCHOTTKY process helps with noise. ...

Sorry about that. It does suck, I know. Prototypes are essential before any large order.
If you want, PM me and maybe you could send me a sample to tinker with. I’ve used the 10F322’s exclusively now for a few years. After that one hiccup I mentioned earlier, it’s been golden.

Iirc, there are about 8 snes OEM variants....
I sold all my unique consoles to HD Retrovision when he was testing his HD cable sets years ago.

You know I was just starting to feel confident that my designs were nearing a final revision and that I wouldn't have to touch them again. I guess it'll never end... That never ends.... lol. I’m rapidly approaching the end of the alphabet for revisions on a few designs... Keep the CIC traces far aw...

I had a similar issue years ago where a pcb I made worked perfectly on most consoles but there were a few consoles that it crashed on (CIC related both 10F322 and 629). I had managed to acquire most of the snes consoles revisions to test on. There were definitely consoles that were more forgiving th...

What happens if you power cycle or reset a few times? When it detects a “wrong” region, it will switch over and you must power cycle or reset the console. Or if the pairing with the console goes awry, it’ll switch regions. Usually a reset twice will switch it back to whatever the consoles region is....

Muramasa Entertainment sells universal SFC/SNES shells as well as the American square ones. There are also various PCBs with support for Lo-ROM, Hi-ROM and battery-backed SRAM. I haven't tried them yet myself, so I can't say if they are any good or not. They also have Famicom and NES PCBs with shel...

Here's what I want to do with it: I offer PCBs with parts pre-mounted, and I recently found some surface mount SRAM to try out. My plan is to be able to produce carts with everything already on the board, except the EPROM. I designed a programming board with a SNES cart connector on it so I can plu...

I guess what makes the most sense is to have some external device run a cart integrity test before something is actually mounted on the cart.

Huh? To what end? You’re asking for a program that would test the pcb that it’s installed into? Testing itself? Not sure I follow what you are asking about.