[rescue] I/O coprocessors?

[Scott Newell]

Legend has it that the popular Microchip PIC series microcontrollers are
derived from an old General Instruments I/O coprocessor designed for a 16
bit microprocessor.  I have a textbook that refers to the Intel 8089 as an
I/O processor for use with 8088/8086 based systems--strange little beast.

Did anyone actually use the 8089?  (I don't think I've ever seen one.)

Are there other microprocessor families with dedicated I/O processors?
Moto 68k?  Zilog?


newell