27C322/27C160 to SNES Extended Adapter Board

27C322/27C160 to SNES Extended Adapter Board


Please select a quantity
Almost gone. There's only 2 left.

Item details


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:
Note: you will be refunded to you after you place the order - Etsy doesn't let me do this automatically
5 - $3.75 each
10 - $3.65 each
25 - $3.50 each
50 - $3.25 each
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 and 27C160 EPROMs with your SNES cartridges to make reproductions. The 27C322 and 160 are 42-pin devices, 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 Mask ROM! Just clip the /OE pin on the original ROM and bridge the pin to VCC.

If you want to use this extender board with 27C160s, you can, you just have to also clip pins 8 and 16 on the multiplexers (see above picture). If you only have 27C160's, I would recommend using the version of the board that does not come with pre-soldered multiplexers, as it is cheaper and you won't be wasting two multiplexers: https://www.etsy.com/listing/760381682/27c32227c160-to-snes-extended-adapter

This board will work for nearly any reproduction SNES game up to 32 Mbit (4 MB). It fits nicely in the original SNES PCB and also on reproduction boards. This listing does not include the EPROM as well, it is only in the pictures for reference. Please note that this board WILL NOT fit donor cartridges that have three chips stacked on the right side, such as the board seen here: https://snescentral.com/pcbboards.php?chip=SHVC-2J3M-01

When used with a SNES board that only has one or two chips stacked on the right of the board, the original board plus this adapter will fit inside the cartridge.

You may need to trim back "mousebites" on the PCB to fit the 27C160 in the socket (see picture). 27C322 should have no interference.
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: http://thepoorstudenthobbyist.com/2020/01/28/27c322-27c160-to-snes-mask-rom-extended-adapter-board/

You can check out how you can make games with this board at my website: https://thepoorstudenthobbyist.com/2017/09/14/how-to-make-a-snes-reproduction-cartridge/

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!

Shipping & returns

Get it fast! Ready to ship in 1–2 business days.
From Broadview Heights, OH
Returns and exchanges accepted
Exceptions may apply.

Meet PoorStudentHobbyist



Cleveland, Ohio

This seller usually responds within a few hours.

For legal reasons, I cannot mark items as gifts when shipping internationally. All items will be marked as merchandise, and I am not responsible for any customs fees or VAT fees. Thank you for understanding!
Probably! Just message me or include it in the personalization section and I'll let you know if I have any other parts I don't currently offer separately or in a bundle and their prices, such as SRAM or multiplexers!


5 out of 5 stars (6)