: Despite the "A" in the filename (which usually suggests an American/NTSC-U region), it is frequently identified in BIOS DAT files as version 4.1 (12/16/97 E) , which actually corresponds to the European/PAL region versions of the console (SCPH-7002, 7502, and 9002).
Here are the most helpful, defining features of using this specific type of file: bios41a.bin