The team at MOS Technology had previously failed to produce two graphics chips named MOS Technology 6562 for the Commodore TOI computer, and MOS Technology 6564 for the Color PET, due to memory speed constraints. as a successor to the MOS Technology 6560 "VIC". The VIC-II chip was designed primarily by Al Charpentier and Charles Winterble at MOS Technology, Inc. Succeeding MOS's original VIC (used in the VIC-20), the VIC-II was one of the two custom chips mainly responsible for the C64's success (the other chip being the 6581 SID).
The VIC-II ( Video Interface Chip II), specifically known as the MOS Technology 6567/6566/8562/8564 ( NTSC versions), 6569/8565/8566 ( PAL), is the microchip tasked with generating Y/C video signals (combined to composite video in the RF modulator) and DRAM refresh signals in the Commodore 64 and C128 home computers.
MOS 6569R3 (PAL version) on a C64 main board
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