Battery-backed Game Doctor SF3?

Battery-backed Game Doctor SF3?
by papa_november on 2009-11-01 (#51938)

I recently got one of these old SNES cartridge copiers, and it's kind of silly that it loses both the contents of SRAM and DRAM when it's power is disconnected.

Now I know it would probably take an obscene number of batteries to run the whole copier for any length of time (which is pretty much necessary to keep the DRAM alive), but what about the SRAM? Could I just hook up a coin battery to each of the SRAMs (or better yet, swap in Dallas NVSRAM modules of the appropriate size) to keep them from losing their data? Has anyone tried this before?

by Memblers on 2009-11-01 (#51940)

If you just hook a battery up to it I believe you need some kind of monitor/control chip to handle it. An NVSRAM module sounds like it would work, if it there's enough clearance (some of them look pretty tall).

There is also an FRAM chip by Ramtron that can replace 256kBit SRAM, but the 5V version will wear out eventually (it gets wear from reads as well as writes). http://www.ramtron.com/products/nonvolatile-memory/parallel-product.aspx?id=51, for a more exotic solution.