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coinheaven or someone did one a run at one time but it was exclusive to him.

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Mottzilla is who did the mapper hacks, he doesn't like to give out the files though as he works with Coinheaven to produce them.

http://thegaminguniverse.org/ninj...

I thought Gwyndion did one too if I'm not mistaken. But that might just be a NES repro. I think he showed me a copy when he was showing me his collection.

I've tried a few different Famicom-only mappers (Konami, Bandai etc) that use 28 pin 1Mbit Mask ROMs, those ones were wired the same as Nintendo's UNROM board. I haven't tried a Taito game like this though.

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I also want to convert my own copy. The PRG wiring I think I have in hand however I'm unsure how you would go about wiring the CHR ROM as U*ROM usually uses 28 pin CHR RAM.

I'm having a similer issues wiring Digital Devil Story aswell due to the same issue so if anyone can shed any light on either that would be totally awesome!

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Proveaux, technically it's just UNROM, not U*ROM. UOROM has a 32 pin socket. Really though it's Nintendo 32pin, with 28 pin backwards compatibility. How about we call it "1Mbit in 28 pin socket" or something similar? That is essentially the heart of the issue.

Clarky, according to NESDev's Namcot 108-series mapper pinout, it's not possible to install the English translation of Megami Tensei, because the mapper doesn't support PRG A17 for 2Mbit PRG ROM. Otherwise the wiring is probably the same as Nintendo's "1Mbit in 28 pin socket" wiring. How the translation works in emulators and flash carts, I'm not sure.

http://wiki.nesdev.com/w/index.ph...

Also, if the NESCartDB page for Megami Tensei is any indication, I'd stay far away from that game as all its chips are made by Fujitsu. Mind you, that's not an issue for the Mask ROMs, those will be replaced with EPROMs. The 74xx32 is easy to replace too. The big problem is the mapper is made by Fujitsu too. In case you don't know, Fujitsu is notorious for poor quality chips. Expect Megami Tensei carts to die.

http://bootgod.dyndns.org:7777/pr...

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Lots of games using boards like SNROM and TKROM use a 28 pin PRG if it's 1Mbit in size to save on costs.

I didn't know that about Megami Tensei. If the Fujitsu chips are anything like there attempt at making PC's then I can fully understand why you say that they are unrealible. With regard to the PRG A17, I found this out a couple of days ago but was hoping that I may be able to use an alternate mapper which supports A17 but haven't really looked into it to deeply. Thanks for the confirmation on this anyway.

Going back to Akira, if the PRG is UNROM wiring then is the CHR wiring the same?

Hmmm Which version of Akira is UNROM? I've found that the "hM04-tl*" versions are TxROM according to Famirom, but they don't appear to execute properly.

Or perhaps the proper question is, is Mapper 33 UNROM compatible ? If that's correct then I assume a standard UNROM pinout would work, right ?

Clarky, if both CHR and PRG are 28pin 1Mbit, then yes the wiring will be the same.

I very highly doubt Mapper 33 is UNROM compatible. It's kinda missing some things, like CHR RAM for instance. That and it's a third party mapper.

When we say "UNROM wiring", we mean the game copied Nintendo's cost cutting custom 28 pin 1Mbit ROM chip. There doesn't exist an EPROM of that configuration. Shaving four pins off the ROM package is significantly cheaper than the standard alternative. If the game uses a 28 pin 1Mbit PRG or CHR (especially if it's Famicom), then chances are it's wired like UNROM. Pin 2 to hole 22 (A16 1Mbit), Pin 24 to ground (/CE). It's as simple as that.

(sometimes UNROM instructions say hole 22, but to the 32pin EPROM it's hole 24, easy to get confused)

With it being over 3 years old, I added Akira's patch to my site. It's under the mapper hack section. If the link doesn't appear you may need to refresh the page.

awesome, thanks a lot guy. your work is always much appreciated.

As long as you're in the giving mood I'll take this opportunity to hijack and ask about Almana no Kiseki. Any plans to share that one? 

Funny, I just beat this last night, well sort of. The near ending of the game (english translated version) has a glitch that renders the game unbeatable as the text gets scrambled and it hangs up. Therefore, I wouldnt bother unless this issue is fixed.

Thanks a lot Mottzilla, I echo the sincere appreciation for your work and as you can see from Lincoln's post, as I also mentioned on nesdev, your Almana No Kesiki MMC1 patch/changes are very much so desired

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Is that a problem with the english translation in general or the mapper hacked version? I've never actually played Akira. I did the hack, everything seemed to work. I had to leave testing to others.

I may release the Almana port, but it's complicated due to IPS patching being unable to reasonably modify the FDS file into the NES rom file. Similar to my Splatterhouse port, large amounts of data have to be moved around which IPS is not designed for that. We'll see.

Try BPS then, it allows for complex patching.

http://www.romhacking.net/utiliti...

I had heard of BPS in the past but never looked into it. It seems like it does work for what I need it to do.

Xdelta should work also, it can move around data, it's what I used for my swap binned RTDL patch