This is an APR "EMCS 2." It's a fancy Flash emulator board built using an AMD flash chip and a Xilinx CPLD. You could program it at home using a goofy little tool that APR sold with it, that plugged into the ribbon connector you see on the board. I think it supported some kind of map switching. It's probably not worth figuring out in 2022, just get a normal flash chip and make a tune.
Thanks man, very cool info I’ll look into it. Looks like a neat piece of hardware.
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