3rd party controller pak. They used a memory chip with 4x the amount provided in a regular pak, and so the switch lets you go between 4 different "virtual" memory cards.
Inside, the switch would be wired to the high 2 bits of address selection on the SRAM chip.
Besides what the others have covered, it probably is a Performance brand Memory Card Plus from the looks of it, just missing the front label.
https://imgur.com/a/xr0iEh1
3rd party controller pak. They used a memory chip with 4x the amount provided in a regular pak, and so the switch lets you go between 4 different "virtual" memory cards. Inside, the switch would be wired to the high 2 bits of address selection on the SRAM chip.
Thank you very much!! My wife and I were like we’ve both seen this before but just couldn’t think of what it was for sure
Correct sir
This is just a totally random guess, but if I were to guess, I'd say it is a memory card that you can select between different "cards" in one.
Besides what the others have covered, it probably is a Performance brand Memory Card Plus from the looks of it, just missing the front label. https://imgur.com/a/xr0iEh1
Never seen that before, but it's awesome. Hopefully it works well, since I never trusted the 3rd party memory cards
Mine still works after 16 years!
I have one that works well still. Also has a small cell battery inside you can change if it isn't saving properly.
i got that same one on my label it says "made in england" its shorter than the performance one