Motorola MC68000 ( plastic leaded chip carrier (PLCC) package) The original 68k is generally software forward-compatible with the rest of the line despite being limited to a 16-bit wide external bus. The 68k was soon expanded with more family members, implementing full 32-bit ALUs as part of the growing Motorola 68000 series. The 1988 Mega Drive console is also powered by a 68000. It was widely used in a new generation of personal computers with graphical user interfaces, including the Macintosh, Amiga, Atari ST, and X68000. For this reason, Motorola termed it a 16/32-bit processor.Īs one of the first widely available processors with a 32-bit instruction set, and running at relatively high speeds for the era, the 68k was a popular design through the 1980s. Internally, it uses a 16-bit data arithmetic logic unit (ALU) and two more 16-bit ALUs used mostly for addresses, and has a 16-bit external data bus. The address bus is 24 bits and does not use memory segmentation, which made it easier to program for. The design implements a 32-bit instruction set, with 32-bit registers and a 16-bit internal data bus.

The Motorola 68000 ( sixty-eight-thousand also called m68k, Motorola 68k, sixty-eight-kay) is a 16/32-bit complex instruction set computer (CISC) microprocessor, introduced in 1979 by Motorola Semiconductor Products Sector.

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