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Intel 8089

Microprocessor

Pinout of Intel 8089

The Intel 8089 input/output coprocessor was available for use with the 8086/8088 central processor. It was announced in May 1979, but the price was not available at that time. 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. This I/O processor was available in July 1979 for US$194.20 in quantities of 100 or more. Intel second sourced this coprocessor to Fujitsu Limited.

Because IBM didn't use it in the IBM PC design, it did not become well known; later Intel 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.

Peripherals

Intel 8282/8283: 8-bit latch
Intel 8284: clock generator
Intel 8286 / 8287 were 8-bit data bus transceivers. Both Intel I8286 and I8287(inverting version) were available for US$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
John Atwood, Dave Ferguson: Debugging Strategies And Considerations For 8089 Systems , Application Note (AP-50), September 1979, Intel Corporation.
Jim Nadir: Designing 8086, 8088, 8089 Multiprocessing System With The 8289 Bus Arbiter , Application Note (AP-51), März 1979, Intel Corporation.
Robin Jigour: Prototyping with the 8089 I/O Processor, Application Note (AP-89), Mai 1980, Order number AFN 01153A, Intel Corporation.
Hard Disk Controller Design Using the 8089, Application Note (AP-122), Order number 210202-001, Intel Corporation.
Graphic CRT Design Using the Intel 8089, Application Note (AP-123), Intel Corporation.

References

Intel Corporation, "Microcomputer Components: Intel Introduces the 8089 IOP, an I/O processor for the advanced 8088/8086 CPU family, the first of a series of new subsystem components", Intel Preview, May/June 1979, p. 7.
Intel Corporation, "8089 Price Announcement", Intel Preview, July/August 1979, p. 25.
Intel Corporation, "NewsBits: Second Source News", Solutions, January/February 1985, P. 1
"Hardware manual".
(7 November 1983). "Review: Altos 586". InfoWorld.
. (1983). ["Introduction to the System 86/360 and System 86/330A Microcomputer Systems"](http://bitsavers.informatik.uni-stuttgart.de/pdf/intel/system3xx/172758-001_Introduction_to_the_System_86_330_and_380_Systems_Mar83.pdf). *Intel*.
(May–June 1980). "8086 Available for industrial environment". Intel Corporation.

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