Intelligent serial I/O subsystem

Details Intelligent serial I/O subsystem Intelligent serial I/O subsystem

1988-03-04

1990-11-20

Heckler, Thomas M.

Boots, shoes, and leggings

3649314, 36493144, 3649424, 36492799, 36496431, G06F 1312

Patent

active

049723685

ABSTRACT:
An I/O subsystem is provided for a series of terminals that communicate via a system bus with a host PC, supporting a series of UNIX.RTM. based PC application programs. The I/O subsystem includes a plurality of I/O subassemblies, each having a series of ports dedicated to the user terminals on a one-to-one basis. Each I/O subassembly includes a CPU including internal memory, a dual ported memory and serial I/O interfaces. Keystroke signals from a sending terminal are transmitted through the interface of the dedicated I/O subassembly to the memory of the subassembly for interpretation and then retransmitted to the sending terminal and/or host PC. Each I/O subassembly dual ported memory is programmed with a UNIX.RTM. based I/O subsystem management method. Additional features of each I/O subassembly include flexible message handling, remote procedure calls and speedup of character input/output processing.

REFERENCES:
patent: 3534338 (1970-10-01), Christensen et al.
patent: 3702462 (1972-11-01), England
patent: 4100601 (1978-07-01), Kaufman et al.
patent: 4636947 (1987-01-01), Ward

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