| 1,822 sales | 5 out of 5 stars

Nintendo NES Cartridge Circuit Board - Discrete



Other people want this. 3 people have this in their carts right now.

Star Seller. This seller consistently earned 5-star reviews, shipped on time, and replied quickly to any messages they received.

  • Handmade


This is a custom PC board I designed that you can use to make your own homebrew NES games with, or repair old games that no longer work. This board can be used to make AxROM, BNROM, CNROM, GNROM, NROM, and UxROM games. Just solder the pads on the board, and solder the appropriate parts on the top of the board! Please note that while the 74-series chips, CIC, CHR RAM, and 28-pin PRG or CHR ROM chips (64K or smaller, NOT 128K) from the original boards can be used on this board, 32-pin ROM chip(s) have a different pinout and can't be transplanted without manual rewiring.

Detailed information on how to construct the finished board, its full capabilities, and a parts list can be found at my website.
Capacitors should be rated at 16V or higher.

This board accepts the 27C series of EPROM, from 27C256 to 27C080. It also accepts flash memory chips like the 39SF010, 020, and 040. ROMs should be padded to fill up the entire space of the chip, by duplicating the ROM (for example, a 128K ROM on a 1M device should be duplicated eight times).

Here are a list of parts you will need based on the game type you want to make.
NROM: 2x ROMs (CHR and PRG)
CNROM, GNROM: 2x ROMs (CHR and PRG), 74HC161
BNROM: 1x ROM (PRG), 1x SRAM (CHR, 6264 series), 74HC161
AxROM: 1x ROM (PRG), 1x SRAM (CHR, 6264 series), 74HC161, 74HC02
UxROM: 1x ROM (PRG), 1x SRAM (CHR, 6264 series), 74HC161, 74HC32
You will need a CIC (or a clone CIC on ATTINY13) to play on non-top-loader NES consoles. Also, you will need one electrolytic capacitor (C1, 22uF) and one ceramic capacitor (C2 - C7, 100nF) for each chip you use on the board.

The first time you start your game up, if it does not immediately boot up, you should press the reset button 5 to 10 times. The CIC needs to be reset a few times in order to obtain the correct region.

Please, check out my website listed above for extremely detailed instructions on how to construct a game of your own, and if you have any questions, contact me!


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Dec 10-20

Dec 1

After you place your order, MouseBiteLabs will take 5-7 business days to prepare it for shipment.

Dec 8-12

MouseBiteLabs puts your order in the mail.

Dec 10-20

Estimated to arrive at your doorstep Dec 10-20!

Etsy offsets carbon emissions from shipping and packaging on this purchase.
Etsy offsets carbon emissions from shipping and packaging on this purchase.
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Ships from Peninsula, OH



Owner of MouseBiteLabs

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337 reviews

5 out of 5 stars
5 out of 5 stars

This is a great board for getting started. I ordered several and soldered up one for each type NROM/CNROM, AxROM, and UxROM. I'm using these as dev boards rather than for repros so one thing that would be useful is a 1x3 through-hole header footprint for mirroring.

gzip May 26, 2022

5 out of 5 stars

Works perfectly, I put my homebrew NES game onto it and it worked just fine. Easier to solder than expected.

Brayden Aug 9, 2022

5 out of 5 stars

Boards are very nice quality!! The owner is awesome at answering any questions!! Highly recommend this shop!! I used my wife's Etsy account to purchase!!

Lizzie Jun 30, 2021

5 out of 5 stars

I couldn't get the NES to power on until I realized I didn't need to bridge the 2 plates on all the capacitors (eyeroll at myself for stupidity). The only other issue I had was I couldn't get the NES to even power on with a CIC from Second Gen, so I replaced it with a regular NES CIC and it worked great...of course that could have been the bridged plates, eyeroll again. Yeah, great board, quite a time saver!

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