The only way to identify the BIOS number of your PS2 is to open up your
PS2 machine and have a look at the motherboard; there will be a black
chip with writing like the example below. In this case, the BIOS number is "010"
Example:
C 2000 SCEI
D 110 010
04538FG
Date Code Identification:
To identify the Date Code of your PS2, you only have to read the label in the back
of your PS2 and refer to the picture
