Old emulators forced you to juggle 15 physical memory card files (.mcr or .mcd). The approach is virtualized, indexed, and automatic.
Unlike modern console emulators that can run games entirely through high-level emulation, the PS1 requires a copy of its original file. This is a small piece of firmware that handles the console's startup sequence, CD-ROM control, and low-level hardware functions. emulator ps1 psx 113 bios memory card new