You're looking for information on the PS1 ROM.bin file and its relation to the PS3 and PS1 BIOS.
Performance
Obtaining PS1-ROM.BIN and PS1 BIOS
Extraction Tool (Alternative): You can also use the PS BIOS Claim Tool to automate the extraction of both PS1 and PS2 BIOS files directly from the firmware update. Using ps1_rom.bin in Emulators Ps1-rom.bin -ps3 Ps1 Bios-
Convert your PS1 discs to BIN/CUE or ISO format on a PC. Copy them to /dev_hdd0/PSXISO/. When you refresh WebMAN, the games will appear in your XMB (XrossMediaBar) under "PlayStation." You're looking for information on the PS1 ROM
When you play a PS1 game on a PS3, the console's emulator uses the PS1 ROM.bin file to replicate the original PS1 environment. This allows the PS3 to run PS1 games without requiring the actual PS1 hardware. Copy them to /dev_hdd0/PSXISO/