Motorola MC68000 - Moore's Law In Pictures
The first 32-bit multi-chip microprocessor designs appeared before 1980. The most popular was Motorola’s MC68000 (known as the 68k). The chip’s architecture is still in use and sold today--though now by Freescale Semiconductor. It is sort of a hybrid--working with 32-bit registers but 16-bit data paths and a 16 bit external data bus. It can address up to 16MB of memory, and features about 40,000 transistors. By the mid-1980s, you could find the 68k inside the Apple Lisa and Macintosh, the Atari ST and the Commodore Amiga.
Following the 68k, Motorola produced a long line of successful 32-bit microprocessors including the MC68010 and the MC68020, which took off in the Unix market. The streak kept up with the MC68030 and MC68040, but finally ended with the MC68050 and MC68060.