You must have a PlayStation BIOS file (commonly SCPH1001.bin ) for the emulator to function.
If you prefer the old way (8 blocks per card, 15 cards per slot), you can still do that:
Click the button to browse and select your BIOS file from the bios folder . 3. Creating and Managing Memory Cards
: Use the in-game save points to save to your virtual memory card. You can also use Save States for quick saving at any point via the emulator menu.
Create an empty 128 KB binary file: