: Its BIOS contains drivers for the highly integrated EE+GS (Emotion Engine and Graphics Synthesizer) unified chip architecture. PS2 BIOS Version Reference BIOS Version Typical Console Models Key Features/Notes SCPH-10000, 15000 Early Japanese "ProtoKernels"; less stable. v1.20 - v1.60 SCPH-3000x, 3900x Standard "Fat" models; PAL and NTSC-U variants. v2.00 - v2.20 SCPH-5000x, 700xx Early Slims; highly compatible with homebrew. v2.30 (2008) SCPH-9000x "Super Slim"; patched to block FMCB; internal PSU.