If you're interested in legal, technical information about PSP/PS1 emulation and BIOS requirements:
While ePSXe is outdated, it still works with psxonpsp660.bin. psxonpsp660bin bios file extra quality
Solution: Format your memory card within the emulator after switching to the 6.60 BIOS. Older BIOS formats are not 100% compatible. If you're interested in legal, technical information about