SNES to 27C322 Extended Adapter Board

SNES to 27C322 Extended Adapter Board


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Please read the entire description! This listing is for the BOARD with multiplexers only! Unlike the smaller adapter boards, you do NOT need any 18-pin headers to use this board, and you don't need to remove the existing EPROM!

Bulk pricing - applies to ENTIRE order!
10-24 items: 10% off with coupon code PSH10
25-49 items: 15% off with coupon code PSH15
50 or more items: 20% off with coupon code PSH20
Please message or email me for larger quantity inquiries!

This is a custom PC board I made that allows you to use the popular 27C322 EPROMs to refurbish your old SNES games, or put your own homebrew games on original hardware. The 27C322 is a 42-pin device, but the SNES EPROM socket is only 36 pins large. This board is similar to the small adapter boards I offer, but you can use this board without having to remove the original ROM! Just clip the /OE pin on the original ROM and bridge the pin to VCC.

If you want these boards with the 16 Mbit 27C160 EPROMs, please see my other listing:

When put into the board properly, it fits nicely inside the cartridge. Note that it will not fit inside the cartridge with every existing SNES boards, but it will for most. There must be at least approximately 2 centimeters clearance to the top of the cartridge (see picture). In general, if your board only has one EPROM and SRAM chips, or two EPROMs and no SRAM, it should fit ok.

You may need to trim back "mousebites" on the PCB to fit the EPROM in the socket (see picture).
Trim the backside pins on any chip that interferes with the board to ensure the adapter board is close to the donor. Try fitting it in the cartridge before soldering to be sure.

Find detailed instructions and explanations on this board at my website:

You can check out how you can make games with this board at my website:

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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Broadview Heights, OH

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Shop rating

5 out of 5 stars

Total shop reviews



Thomas Sep 19, 2019

5 out of 5 stars
Not my first order from this shop just the first one I could leave a proper review for. The owner is very helpful and goes beyond customer support standards in helping. His products are quality and priced fairly. He ships very fast and is quick to respond to questions. Will definitely be buying more from this shop when I run out!

Purchased item:

Sean Nov 2, 2019

5 out of 5 stars
Very high quality finish board with an excellent tutorial to help the beginner populate and create their own repro project. Nick is beyond helpful, and his products are top notch.

Purchased item:

Sean Oct 24, 2019

5 out of 5 stars
Great design for programming large 42 pin EPROMS. Nick was very helpful with some questions that I had, and his knowledge and skill really show with this adapter.

Purchased item: