There was the early PS3SX emu on 3.41, but yea was just a simple PoC port and not sure if much ran well if anything on it..
There was also the PS3SX emu from late 3.55 era or early 4.xx with dynarec support from IngPeria (i think i butchered his name spelling)/ That was much better and was a PoC of his dynarec support. .
Later on as a PoC to show why a dynarec is needed, retroarch (in an unofficial build) had mednafen ps1 emulation and the emulation was very accurate it was just slow. Crash Bandicoot would play all the way through (or as long as you could take it) just very slow and choppy.