Adding an IEEE-488 Bus Controller to a 5620 (86-27)

This memorandum describes an interface circuit to convert the parallel port (of a Teletype 5620 Dot Mapped Display terminal) to an IEEE- 488 bus controller. Interface hardware fits on a small circuit board that attaches to the rear of the 5620 and is powered by the parallel port. Interface software is provided by a library of access functions linked with application programs and down loaded to the 5620 from a Unix host.