Commodore unveiled the C128 at the Las Vegas CES in January 1985 as an advanced successor to the Commodore 64 and the company’s final commercially released 8-bit home computer. Its most distinctive feature was the combination of three environments in a single machine: a C128 mode with 128 KB of RAM and BASIC 7.0, a highly compatible Commodore 64 mode, and a CP/M mode based on a second Z80 processor. In addition to the C64-compatible VIC-II, it incorporated the 8563 VDC video controller for an 80-column RGBI output. Hardware design was led by Bil Herd.