He found it. A tiny file, barely 512 kilobytes. He downloaded it, feeling a small pang of guilt about not dumping it himself, but the promise of Crash was stronger.
for your specific emulator (DuckStation, RetroArch, etc.). Download pSX BIOS bin
The internet, as it often does, whispered back with a thousand results. He was flooded with advice from forums like Reddit and GitHub. Scph1001.bin? (The classic North American BIOS) Scph5501.bin? (Better for newer models) He found it