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Tech Talk Adapters for Dumping NES/SNES Mask ROMs

Feb 20 at 5:20:12 PM
MrPete1985 (34)
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< El Ripper >
Posts: 1136 - Joined: 07/13/2014
Pennsylvania
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Thought some other people might find this helpful

Made myself some boards to help in repairing NES or SNES games.  With these boards you can convert your NES or SNES mask ROMs to the JEDEC standard so it can be read with a standard EPROM programmer.  I wanted to be able to check the ROM CRCs against the BootGod DB and this was cheaper than a CopyNES.

I made 3 boards



Got adaptors for NES PRG, NES CHR, and MMC5 or SNES 8Mbit

Here are links to the projects on OSH Park
https://oshpark.com/shared_projec...
https://oshpark.com/shared_projec...
https://oshpark.com/shared_projec...

Just need some headers and ZIF sockets


And here is a video I made putting them together and dumping some ROMs



 

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Just about anything you would want to know about SNES repros
The best SNES PCBs you can buy
Mask ROM Adapter Boards
Fixing stuff on my YouTube channel

I fix game cartridges and make repros.  Send a PM If you are interested in my services.


Edited: 07/12/2017 at 02:10 PM by MrPete1985

Feb 20 at 5:25:06 PM
Lincoln (133)
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(Frank W. Doom) < Bowser >
Posts: 5580 - Joined: 12/19/2008
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does the prg board accommodate both short 128K roms and 256K roms?

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ebay auctionsrunning FS thread famiROM updates and download thread for .nes info and splitting

Feb 20 at 5:29:33 PM
MrPete1985 (34)
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< El Ripper >
Posts: 1136 - Joined: 07/13/2014
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Originally posted by: Lincoln

does the prg board accommodate both short 128K roms and 256K roms?


Tested UNROM, MMC1, MMC3 on the PRG board, I dumped 128k, 256k and 512k ROMs.  Think AOROM should work but did not have any to test.
I used Kirby's Adventure in the video because it uses a 512k PRG and 256k CHR

-------------------------
Just about anything you would want to know about SNES repros
The best SNES PCBs you can buy
Mask ROM Adapter Boards
Fixing stuff on my YouTube channel

I fix game cartridges and make repros.  Send a PM If you are interested in my services.

Feb 20 at 5:53:14 PM
Lincoln (133)
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(Frank W. Doom) < Bowser >
Posts: 5580 - Joined: 12/19/2008
California
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neat. this has been on my todo list for a while but I have no experience designing pcbs. thanks for sharing!

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ebay auctionsrunning FS thread famiROM updates and download thread for .nes info and splitting

Feb 20 at 7:08:59 PM
Abelardo (75)
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(Abelardo González) < El Ripper >
Posts: 1244 - Joined: 10/26/2011
Mexico
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Thanks MrPete1985, I was thinking about dumping a non working cart that I have and got as far as desoldering the PRG chip but didn't knew how to dump it.

MrPete1985 or anybody who orders from OSH Park care to sell me a set? I don't want to order 3 sets (minimum order), also I got an address in the US  

Feb 21 at 3:57:38 AM
Lincoln (133)
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(Frank W. Doom) < Bowser >
Posts: 5580 - Joined: 12/19/2008
California
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yeah maybe we can do a group buy or something.

@mrpete would that mmc5 adapter work for 4mb/8mb SNES mask roms?

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ebay auctionsrunning FS thread famiROM updates and download thread for .nes info and splitting

Feb 21 at 4:52:16 PM
MrPete1985 (34)
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< El Ripper >
Posts: 1136 - Joined: 07/13/2014
Pennsylvania
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Kinda, the chips that are larger than 8mbit are DIP36 instead of DIP32. What you could do is dump the ROM in parts by adding wires to A20 and A21 and manually wiring them to GND or VCC.

You could dump the ROMs in 4 parts then stitch them back together using the command prompt.

-------------------------
Just about anything you would want to know about SNES repros
The best SNES PCBs you can buy
Mask ROM Adapter Boards
Fixing stuff on my YouTube channel

I fix game cartridges and make repros.  Send a PM If you are interested in my services.