Playstation 2 Slim (SCPH - 90000)
In July 2007 Sony started shipping a revision of the slimline PlayStation 2 (SCPH-7900x) featuring a reduced weight of 600 grams compared to 900 g of the SCPH-7700x, achieved through a reduction in parts. The unit also uses a smaller motherboard as well as a custom ASIC which houses the Emotion Engine, Graphics Synthesizer, and the RDRAM. The AC adaptor's weight was reduced to 250 g from the previous 350 g. Another refinement of the slimline PlayStation 2 (SCPH-9000x) was released in Japan on November 22, 2007. As well some cosmetic changes, the design of the hardware was overhauled, incorporating the power supply into the console itself like the original PlayStation 2 revisions; this also reduces the total weight to 720 grams (25 oz). SCPH-9000x series consoles manufactured after the third quarter of 2008 as the last revision of the PlayStation 2, some changes were (indicated by date code 8C) incorporate a revised BIOS, which disables an exploit present in all older models that allowed homebrew applications to be launched from a memory card.