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| {{Short description|Microprocessor}} | |||
| The '''Motorola MC68008''' is a 8/16/32-bit ] from the early 1980's. It is an ] ] version of the ] ], and can address 1] or 4MB of memory (using a 48-pin or 52-pin package, respectively). | |||
| {{More citations needed|date=June 2021}} | |||
| ] | |||
| ] motherboard]] | |||
| ] | |||
| The original 48-pin package version was used in the ], to make maximum use of inexpensive 8-bit technology on the motherboard while computing internally with the relatively fast 16/32-bit processing engine. | |||
| The '''Motorola 68008''' is an 8/32-bit ] introduced by ] in 1982. It is a version of 1979's ] with an ] external ], as well as a smaller ].<ref name=68kusermanual>{{cite web | |||
| ] | |||
| | url = https://www.nxp.com/docs/en/reference-manual/MC68000UM.pdf | |||
| | title = M68000 8-/16-/32-Bit Microprocessors User's Manual, Ninth Edition | |||
| | website = ] | |||
| | author = ] | |||
| | year = 1993 | |||
| }}</ref> The 68008 was available with 20 or 22 address lines (respective to 48-pin or 52-pin package) 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,{{dubious|date=September 2021|reason=Performance claims come from vendor}} because internally the 68008 behaves identically to the 68000 and has the same ].{{sfn|Motorola|1993|page=1-2}} | |||
| Motorola ended production of the 68008 in 1996.<ref>, 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== | |||
| The 68008 is an ] chip with about {{nowrap|70,000 transistors;}} with a speed grade of {{nowrap|8 and 10 MHz}}. There are two versions of the chip. The original is in a 48-pin ] with a 20-bit address bus, allowing it to use up to 1 ] of memory. A later version is in a 52-pin ]; this version has a 22-bit address bus and can support {{nowrap|4 megabytes}} of RAM.{{sfn|Motorola|1993|page=3-4}} | |||
| ==Usages== | |||
| The ] ] and ] ] use the 68008 as their main processor. | |||
| == References == | |||
| {{Reflist}} | |||
| == External links == | |||
| * | |||
| * | |||
| {{Motorola processors}} | |||
| ] | |||
Latest revision as of 01:15, 1 June 2024
Microprocessor | This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Find sources: "Motorola 68008" – news · newspapers · books · scholar · JSTOR (June 2021) (Learn how and when to remove this message) |
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 (respective to 48-pin or 52-pin package) 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. It was still faster than competing 8-bit microprocessors, because internally the 68008 behaves identically to the 68000 and has the same microarchitecture.
Motorola ended production of the 68008 in 1996.
Details
The 68008 is an HMOS chip with about 70,000 transistors; with a speed grade of 8 and 10 MHz. 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 4 megabytes of RAM.
Usages
The Sinclair QL microcomputer and Luxor ABC 1600 use the 68008 as their main processor.
References
- ^ Motorola (1993). "M68000 8-/16-/32-Bit Microprocessors User's Manual, Ninth Edition" (PDF). NXP Semiconductors.
- Motorola 1993, p. 1-2.
- 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.
- Motorola 1993, p. 3-4.
External links
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