Motorola 68008
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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.<ref name=68kusermanual>Template:Cite web</ref> 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.<ref name=68kusermanual /> It was still faster than competing 8-bit microprocessors,Template:Dubious because internally the 68008 behaves identically to the 68000 and has the same microarchitecture.Template:Sfn
Motorola ended production of the 68008 in 1996.<ref>comp.sys.m68k Usenet posting, May 16, 1995; also see other posts in thread. The end-of-life announcement was in late 1994; according to standard Motorola end-of-life practice, final orders would have been in 1995, with final shipments in 1996.</ref>
Details
[edit]The 68008 is an HMOS chip with about Template:Nowrap with a speed grade of Template:Nowrap. 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 Template:Nowrap of RAM.Template:Sfn
Usages
[edit]The Sinclair QL microcomputer and Luxor ABC 1600 use the 68008 as their main processor.