Intel 8089

The Intel 8089 input/output coprocessor was available for use with the 8086/8088 central processor. It was announced on May 1979, but the price was not available at that time.[1] 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 on July 1979 for US$194.20 in quantities of 100 or more.[2]

Pinout of Intel 8089

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.[3] It was also used in the Altos 586 multi-user computer.[4] Intel themselves used the 8089 in their reference designs (which they also commercialized) as System 86.[5]

Peripherals
  • 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 US$16.25 in quantities of 100.[6]
  • Intel 8288: bus controller
  • Intel 8289: bus arbiter

Literature and datasheets
gollark: What if I describe it in very little detail?
gollark: That sure is the letter X (capital).
gollark: > an additional rule change:> submissions should be your own original work. it is discouraged (though allowed) to take code from external sources such as the internet, and it is no longer allowed to submit original code written by any other member of the server after the round started.What if I just describe my code to someone in detail and have them rewrite it?
gollark: I see.
gollark: Why not just average % after subtracting 1?

References
  1. 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.
  2. Intel Corporation, "8089 Price Announcement", Intel Preview, July/August 1979, page 25.
  3. http://bitsavers.trailing-edge.com/pdf/intel/iSBC/144780-002_iSBC_215_Generic_Winchester_Disk_Controller_Hardware_Reference_Manual_Dec84.pdf
  4. Review: Altos 586. InfoWorld. 7 November 1983. pp. 89–90. ISSN 0199-6649.
  5. http://bitsavers.informatik.uni-stuttgart.de/pdf/intel/system3xx/172758-001_Introduction_to_the_System_86_330_and_380_Systems_Mar83.pdf
  6. 8086 Available for industrial environment, Intel Preview Special Issue: 16-Bit Solutions, Intel Corporation, May/June 1980, page 29.
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