Intel 8089
input/output coprocessor available for use with the Intel 8086 and Intel 8088 CPUs
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.
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