Mapper 82 PRG-RAM read/write is finally done. I had to do some fiddling but I got the PRG-RAM writes working properly.
While working on the PRG-RAM, I decided to work on the Family Basic SRAM. I wrote working code for read/write support of the Family Basic SRAM.
I ordered a few more Mapper 82 test carts and a Family Basic V3 cart so I'll need to confirm that the code works for them.