Because the BIOS timer interrupts are based on the mains frequency (50Hz), games ran 16.7% slower than their NTSC counterparts. Resident Evil door opening animations, Gran Turismo laps, and Final Fantasy VII battles all felt sluggish. The BIOS is the direct reason why many European gamers of the 90s believed PlayStation games were "slow and relaxing."
: It initializes the hardware, displays the "Sony Computer Entertainment" splash screen, and manages the Memory Card and CD Player interfaces. Emulation Use : If you are using emulators like DuckStation RetroArch (Beetle PSX core) Playstation Scph-5502 -v3.0 Europe- Bios Scph5502.bin
The SCPH5502.bin is a technically solid, stable BIOS that faithfully reproduces the European PlayStation experience. Unfortunately, the "European experience" was inferior to the US/JP experience due to 50Hz limitations. Keep this file in your bios folder for compatibility, but set your emulator to boot NTSC BIOS by default unless you specifically need PAL timings. Because the BIOS timer interrupts are based on
The BIOS performs a hardware check upon booting a disc. Emulation Use : If you are using emulators