To play a PS1 game on a PSP, you must convert the original disc’s .bin and .cue files into a single EBOOT.PBP using programs like PSX2PSP or Popstation . During conversion, the software asks for a BASE.PBP file, which is essentially the official Sony PS1 emulator extracted from the PSP’s firmware. The psxonpsp660bin.upd is the most up-to-date version of that base emulator.
: Accessible repositories like the gingerbeardman PSX repository provide the file and detailed documentation. On this page, click the file and look for the Download icon on the far right. download psxonpsp660bin upd
Prevents corruption of virtual memory cards. How to Install the PSXonPSP660.bin To play a PS1 game on a PSP,