| 1,828 sales | 5 out of 5 stars

NES ROM Extended Adapter Board



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

  • Handmade

Find detailed instructions and explanations on this board here:
Find out how to make games with this here:

This is a custom PC board I made that allows you to use your own ROM chips to refurbish your old NES games, or put your own homebrew games on original hardware. With this board, you can make games without having to remove the original ROM! Just clip the /CE pin (pin 22) on the original ROM and wire the pin to VCC.

The board is compatible with the 27C series of EPROM, and the 39SF series of flash memory. The board can be used for both the PRG and CHR ROM chips as necessary for your game. It can also be used for the PRG ROM on the 28-pin UNROM boards. Just be sure to solder the pads on the back to configure the board to the settings you need. See the pictures for an example - note that the installation pictures are of an older revision of the board.

When put onto the board properly, it fits nicely inside the cartridge, even with sockets on the boards for testing out your chips before you permanently solder them in your boards. PLEASE CHECK if your adapter will fit before you solder anything! There are some board types that only have room for one board instead of two, or are too tight of a fit (28-pin Konami boards are usually problematic). If you are having problems, send me pictures, or the board number, and I will try to help as best as I can.

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!
Message or email me for larger quantity inquiries. If you need more stock, please contact me - I might have some extra that's not reflected here.

Note: If you encounter graphical *sprite* glitching, you can try cutting the eight data line traces on the back of the board, and placing 100 ohm resistors (size 0603). This is a somewhat rare problem though, and not associated to *all* graphical glitches. Check my website for more information.


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Dec 17-28

Need it sooner? Get it by Dec 21 if you upgrade shipping

Dec 8

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

Dec 15-19

MouseBiteLabs puts your order in the mail.

Dec 17-28

Estimated to arrive at your doorstep Dec 17-28!

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

Message Nick

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340 reviews

5 out of 5 stars
5 out of 5 stars

These are awesome little boards. I initially bought four of them and after going through those I ordered 10 more. I'm using them for dev so I installed a socket so that the chips can be reprogramed as needed (using the highly recommended T866II Plus). So far I've used them on SGROM, SKROM, SLROM, and SNROM (all MMC1). One outstanding feature is that even with the sockets installed the modified boards still fit nicely in the NES cartridge!

gzip May 26, 2022

5 out of 5 stars

Great product, high quality American design, super fast shipping, AMAZING customer service, and extremely fair prices. Plus it has the *optional* benefit of feeling better about yourself for not destroying a horrible sports video game...if you're one of those people. Very highly recommended!

5 out of 5 stars

Awesome time saver, no desoldering, stripped vias, pulled traces, or bent pins (except 2)...can't recommend enough!

5 out of 5 stars

The parcel came to Belarus in 2 months, it went a long time, but everything came. Zaz is satisfied.

Sergei Jul 21, 2021

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