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MDM

see Bank Switching

see AtariAge: Menu-Driven Multicart for Atari 2600

In Stella, and as described here, the hotspots are from $800 to $BFF instead of $800 to $FFF.

The hotspots in this scheme are read/write at addresses $800 to $BFF, where the lower byte determines the actual 4K bank switch to. In the current implementation, only 128 banks are supported, so selecting bank 128+ results in further bankswitching being locked. A reset line is used to reset to bank 0 and re-enable bankswitching.

Therefore, there are 128 banks / 512K possible in total.