nesdev.org

It worked after migration to a Stunt Race FX donor.

very very weird.
I guess there's a broken trace on the Doom PCB mask rom pads that was being stressed more with the wires than with the mask rom.

I'd be interested in the SNES GSU to TSOP adapters.

I was going to make my own in Eagle, but I'd only use it for 3 repros, so I guess this will save me the effort.

unfortunately, I don't have any flash modules more than 1MB right now, and no logic chips to multiplex them (would that even work on SuperFX?)

It's most likely the rom image.
I tried the eprom and flash in a copy of Yoshi's Island, and it's no good.

Does anyone have a CRC or MD5 for a working rom?

there's something fishy with this copy of Doom.
it seems it only wants to play Doom!

I've tried with an M27c801, byte swapped and regular, and neither will boot, but as soon as I put the Doom mask rom back on, it works fine.

guess it's off to ebay to find a copy of Stunt Race FX.

the TSOP is a AM29F080. It's only 1 Megabyte, and I got a bunch of them for free.

It's hardly a waste, but I'm going to try it again with a M27c801

Ok, I've swapped the clock crystal from a known good cart, and it's no good. I've also swapped another GSU2 from a different copy of doom, and it's STILL no good. I've swapped the SRAM, still no good. Would a bad lockout chip do this? What about the 74HCU04? Is there maybe a broken trace under the s...

I've been struggling for the past day or so trying to get a Star Fox 2 repro working on a Doom donor cart. I used a TSOP40 to DIP36 adapter from Buyicnow (the Type III one), and a AM29F080 I had spare to burn the game. I downloaded the rom image with the matching "good" MD5 as listed on th...

They seem to do SOMETHING, because when I removed them, the pitch of the expansion audio increased.

It was rather squeaky.

On the MMC5 cart, you could try increasing the value of R4 ... that should make it louder, at the risk of potentially clipping. Reducing R1 should also make it louder, and it's possible that removing R2 or C3 might also. See the above post, I found a nice solution. there's a little bit of a hiss in...

It looks like it was being shorted by something. I've fixed it, but now the audio is SUPER low on the expansion audio. I'm looking at the cart for a resistor I can remove, since my 1K pot will only allow a very small level of audio out, so I figure if I lower the resistance of the audio out pin, it ...

per the powerpak mod, I'd modded my top loader to get audio from Everdrive (viewtopic.php?t=7880)

I have it wired to give output on an eternal phono jack through a 1Kohm trim pot.

Presumable, then, I could modify the cart itself to remove the audio circuitry, or modify my NES to allow 2A03 audio into the cart?

Ok, update. I managed to fix the rom, so it boots. The problem was the Famicom to NES converter had expansion audio routed from pin 46 to 54 (I have a top loader). With the pin cut, it runs just fine, but I have, obviously, no expansion audio. I've seen some guides saying to put 2 10kohm resistors i...

I've been trying for like 2 days to get this right, and I'm at my wit's end. I have an original Just Breed famicom cart, and it tested working just fine with the original mask roms. I thought I'd pop the Stealth translation into it via EPROMs, but all I have are MC27C801s (I got a box of like 40 of ...

knowing a correct dump exists is not the same as finding it.

Also, I've got no skill at programming NES, so modifying tapedump to accept an MMC5 game like this is right out.

Also, I don't want to build a parallel port ROM dumper.

If I had to, I'd prefer to use something like a teensy++