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Has anyone ever considered emulating the memory card? It should be feasible, since the pins from the bus (Serial Interfaces SIO) are connected to the controller 1 and also to the memory card slot 1 (and the same for slot 2). The ESP must then also respond to the address of the memory card if the PS1 ask for it.
Infos:
https://psx-spx.consoledev.net/serialinterfacessio/
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