Sega Saturn Internal Memory Mod with FRAM – no battery required
@SegaSaturn
Published in
SegaSaturn
· 28 Feb 2021
... issue on FM1808? #WE Controlled Timing Looking at the Saturn’s BRAM schematic more carefully, you’ll notice that it operates with only 2 control signals: SRAMCE and MWR. Inspecting the UPD43257B datasheet reveals device operation as follows: Read – #CE1 = ‘0’ and #WE = ‘1’ Write – #CE1 = ‘0’ and #WE = ‘0’ Therefore, the Saturn doesn’t use an #OE signal for the BRAM. It simply strobes SRAMCE to read the BRAM contents. Luckily, the FM1808 can operate in a similar mode – #WE controlling timing. Below ...
