Virtual I/O

Details Virtual I/O Virtual I/O

1990-07-27

1991-09-10

Fleming, Michael R.

Boots, shoes, and leggings

3642456, 3642419, 3642321, 364238, G06F 1300

Patent

active

050479229

ABSTRACT:
A method and apparatus are disclosed for coupling external, bidirectional ports to an onboard port of a single chip microprocessor such that the external ports can be addressed in the same manner as onboard ports. Using the disclosed method and apparatus, external ports, which are referred to herein as virtual ports, a single onboard port may be configured that it can be used to address up to twelve virtual ports. The port is used as a multiplexed bus to communicate with the virtual ports. Read (RD) and write (WR) signals are used to perform read and write operations on the virtual ports.

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patent: 4835769 (1989-05-01), Donaghue, Jr. et al.
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