This is a SNES cart PCB that can be used for LoROM or HiROM games with a max ROM size of 16 Mb. It can be used for either a single game, or with the 74'161 installed it can be used as an X-in-1 multi cart. Games are switched by resetting the console.
I have tested this board with a 16 Mb HiROM game on a 29F160, as well as 2-in-1 LoROM games (2 x 4 Mb games) on a 29F800, and everything is working correctly. I will add instructions and a BOM when I get the chance. Until then, pretty much everything is self explanatory.
The jumpers for the four address lines (A20, A19, A18 and A17) control the X-in-1 multi game function. If you close pads 1 and 2 then that address line is controlled by the SNES. If you close pads 2 and 3 then that address is controlled by the 161. If you’re putting a single game on the cart, then close pads 1 and 2 for all four of them.
The placement of the TSOP will interfere with the cart shell support post. While it will fit as is, that post will be putting pressure on the TSOP which may eventually lead to damage. I recommend breaking that post off to avoid any possible issues. A new revision of this PCB is coming soon, and the TSOP will be moved so that it no longer interferes with the support post.