: Officially, you should only use a BIOS dumped from your own physical PlayStation console to remain legally compliant . Tools like Retro Game Corps' Extraction Guide can help you legally extract BIOS files from Sony's own firmware updates .
The answer is nuanced. While ePSXe attempts to work without a BIOS file by using a simulated internal mechanism, this is widely discouraged by the development community. The "simulated" BIOS often results in reduced compatibility. To experience games as they were intended—and to ensure high compatibility with demanding titles like Vagrant Story or Colony Wars —you must supply the external BIOS file. Bios File For Epsxe 2.0.5
If you are playing PAL games (European/Australian releases), this : Officially, you should only use a BIOS
To run effectively, you must provide a BIOS file , which acts as the original console's firmware and ensures high game compatibility. For the best experience, the most commonly recommended file is SCPH1001.bin (USA version), which has a standard size of 512KB. Essential BIOS Files for ePSXe 2.0.5 While ePSXe attempts to work without a BIOS
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