The Intel 8089 input/output coprocessor was available for use with the 8086/8088 central processor. It used the same programming technique as 8087 for input/output operations, such as transfer of data from memory to a peripheral device, and so reducing the load on the CPU.
Because IBM didn't use it in IBM PC design, it did not become well known; later I/O-coprocessors did not keep the x89 designation the way math coprocessors kept the x87 designation. It was used in the Apricot PC and the Intel Multibus iSBC-215 Hard disk drive controller. It was also used in the Altos 586 multi-user computer. Intel themselves used the 8089 in their reference designs (which they also commercialized) as System 86.
- Intel 8282/8283: 8-bit latch
- Intel 8284: clock generator
- Intel 8286/8287: bidirectional 8-bit driver. Both Intel I8286/I8287 (industrial grade) version were available for USD $16.25 in quantities of 100.
- Intel 8288: bus controller
- Intel 8289: bus arbiter
Literature and datasheets
- 8089 Assembler Users Guide; Intel 1979
- 8089 8 & 16-Bit HMOS I/O Processor; Intel 1980
- Robin Jigour: Prototyping with the 8089 I/O Processor, Application Note (AP-89), May 1980, Order number AFN 01153A, Intel Corporation
- Review: Altos 586. InfoWorld. 7 November 1983. pp. 89–90. ISSN 0199-6649.
- 8086 Available for industrial environment, Intel Preview Special Issue: 16-Bit Solutions, Intel Corporation, May/June 1980, page 29
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