Backup RAM Cartridge

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The Backup RAM Cartridge is an add-on device that adds additional static RAM for save games, etc.

Memory Mapping

It's mapped on the A-bus CS1 area. For the sake of simplicity, here's a list of the addresses used by developers.

Address Description
0x24000000-0x???????? Backup Ram is mapped here. It's basically mirrored throughout most of the whole area.
0x24FFFFFF Cartridge ID. This will be 0x21 for 4 Mbit, 0x22 for 8 Mbit, 0x23 for 16 Mbit, and 0x24 for 32 Mbit