thumb|Motorola MC68008
thumb|68008 in a [[Sinclair QL motherboard]]
thumb|STEbus 68008 processor
The Motorola 68008 is an 8/32-bit microprocessor introduced by Motorola in 1982. It is a version of 1979's Motorola 68000 with an 8-bit external data bus, as well as a smaller address bus. The 68008 was available with 20 or 22 address lines (in a 48-pin or 52-pin package, respectively) which allowed 1 MB or 4 MB address space versus the 16 MB addressable on the 68000. The 68008 was designed to work with lower cost and simpler 8-bit memory systems. Because of its smaller data bus, it was roughly half as fast as a 68000 of the same clock speed.
Details
The 68008 is an HMOS chip with about with a speed grade of . There are two versions of the chip. The original is in a 48-pin dual in-line package with a 20-bit address bus, allowing it to use up to 1 megabyte of memory. A later version is in a 52-pin plastic leaded chip carrier; this version has a 22-bit address bus and can support of RAM.
Usages
The Sinclair QL microcomputer and Luxor ABC 1600 use the 68008 as their main processor.
References
Notes
External links
- A small 68008 design
- Kiwi - an 68k Homebrew Computer