Editing Commodore 64 (section)

==== Motherboard ====
In 1986, Commodore released the last revision of the classic C64 [[motherboard]]. It was otherwise identical to the 1984 design, except for two 64-[[kilobit]] × 4-bit [[DRAM]] chips which replaced the original eight 64-kilobit × 1-bit ICs. After the release of the Commodore 64C,<ref name='Commodore 64c abbreviated as "C64C" (capital c on both ends)'>{{cite web|last1=Kirk|first1=Mandy|title=Commodore 64C System Guide at Auction on ebay|url=http://www.ebay.com/itm/Commodore-64C-Personal-Computer-System-Programming-Guide-Manual-RARE-/321552326540?pt=US_Vintage_Computing_Manuals_Merchandise&hash=item4ade031f8c|website=www.ebay.com|publisher=Commodore International|access-date=October 17, 2014}}</ref> MOS Technology began to reconfigure the original C64's [[chipset]] to use [[HMOS]] technology. The main benefit of HMOS was that it required less voltage to drive the IC, generating less heat. This enhanced the reliability of the SID and VIC-II. The new chipset was renumbered 85xx to reflect the change to HMOS.

In 1987, Commodore released a 64C variant with a redesigned motherboard known as a "short board". The new board used the HMOS chipset, with a new 64-pin PLA chip. The "SuperPLA", as it was called, integrated discrete components and [[transistor–transistor logic]] (TTL) chips. In the last revision of the 64C motherboard, the 2114 4-bit-wide color RAM was integrated into the SuperPLA.