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Thanks so much for posting this! I've got an FDS with a failed power board (likely screwed up the power/write mod) and hopefully this will get me to where I need to.

(Sorry for necrobumping.) I'm actually attempting this for the first time, I've done several other MMC3 repros for myself successfully. However, this time I'm stumped. I'm taking a HVC-SNROM-05 DQ3 board and an AM27C040-120 programmed with the DW3 PRG (originally on a NES-SUROM). Unfortunately it do...

Question for genepensive So, in the end, what wiring did you have success with for each type of acclaim board (51555-2 and 53361-2)? Is it just standard TLROM wiring or did you have to make additional changes? I had success with both. There was no re-wiring required, just drop the EPROMs in, IIRC. ...

If you feel up to it, you could consider this a request for verifying the pinout that old post... I have one more MC-ACC board left, I'll give it a shot. I was able to get Mega Man 3 running on my dev/test (socketed) board, I'll run the MMC test suite on it this weekend. Thanks again for your help!

lidnariq wrote:But if I had to take a guess, I'd look closely for a short between CHR A14 and A15.

Wow. I'm blown away. Good call.

There was a tiny solder blob under A15 that was shorting to A14.

THANK YOU! It works perfectly now.

Where in which Mega Man is that? It shouldn't be too hard to figure out what bank is being displayed vs which one was requested, and after we have that information it'll hopefully shed light on what's wrong. This is Mega Man 3 (NA) using the Akklaim (Acclaim) MC-ACC MMC3 clone [53361-2 board] from ...

There's no way that's right: that has to have been shorted together when it shouldn't, You were right. I checked against one of the other boards I have and it looks like I shorted a trace under the socket (the solder wandered). After fixing that, I'm still seeing the following from the CHR rom usin...

Hi, new here. I've got two copies of Roger Clemens MVP to use as donor boards, one is a 53361-2 (MC-ACC) and the other is a 51555-2 (MMC3B). I also have two pairs of 27C020 (one each for CHR/PRG), one with Mega Man 5 and the other with Bonk's Adventure. Both EPROMs work properly on the 51555-2 (MMC3...

GameMachineJames wrote:Also confirmed. I had Mortal Kombat running on this:

What EPROMs did you use?

The 5155's with the cloned MMC3 are wired for EPROMs on the PRG, but the CHR side still needs some rewiring. Sorry to necrobump, but do you happen to have any more information on this? I have a few of these boards and would love to put them to some use. On 53361-2 (MC-ACC), I can get it to boot a g...

Looks like the twitter finds I posted earlier were the fix. The cart is running stable now on my NESRGB US toploader. Keep in mind you have to cut the trace and expose both sides in order to solder the resistor to each side. I ended up using a 68pF cap rather than 100pF. http://i.imgur.com/m6tDVC7.j...

So I found a few interesting tweets: https://twitter.com/bakuten_do/status/694188589832228864 https://twitter.com/taivatri/status/694169232393658368 https://twitter.com/zzr40092/status/695218455855796224 It looks like someone may have found a fix? http://i.imgur.com/SDKTBJh.png http://i.imgur.com/BC...

Been a lurker for a long time and wanted to share some photos of the internals of the "8bit Music Power" chiptune album recently released on cartridge by riki2riki. http://imgur.com/a/F2WMH/all I'm having some issues with the cartridge crashing after a few minutes on my otherwise-ultra-rel...