I'm trying to interface with the Sega Saturn's 32KB Backup SRAM chip, and I was curious if anyone knew the speed the Saturn did this at. The datasheets for the various drop in replacements Sega used from model to model suggest they are capable of operating as fast as 70nS, which would clock it at around 14.28MHz, and I think I've read that the Saturn has an overall system bus speed of 14.3MHz. Although it would be extremely coincidental if the bus speed just happened to be the maximum a single RAM chip on the bus. Any suggestions? I know that several lines run directly to one of the SH2s.
Does the RTC store it's time in the backup SRAM? If so, is it constantly being incremented? Or is the backup RAM strictly for game saves?
