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

• 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

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.