Browse Prior Art Database

CPU/MEMORY STATION - TERMINAL MULTIPLEXER

IP.com Disclosure Number: IPCOM000023930D
Original Publication Date: 1979-Apr-30
Included in the Prior Art Database: 2004-Apr-01
Document File: 2 page(s) / 413K

Publishing Venue

Xerox Disclosure Journal

Abstract

A CPU/Memory Terminal multiplexer 10 allows from one to eight terminals 12 (keyboard, display and cursor control device) to be connected to from one to eight CPU/Memory stations 14 (CPU, main memory and disk drive). A typical configuration might include two CPU/Memory stations and four terminals. The CPU/Memory stations might be in a common area with the terminals placed in individual offices.

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XEROX DISCLOSURE JOURNAL

CPU/MEMORY STATION TERMINAL ~PLEXER
~sairairn

Proposed Classification U~S~CL 34O/172~5
Tnt. CL G06f 1/00

MULTIPLEXER

BOX

FIG.!

Volume 4 Number 2 March/April 1979 243

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cPU/MEMORY STATION TERMINAL MULTIPLEXER (ConVd)

A CPU/Memory Terminal multiplexer 10 allows from one to eight terminals 12 (keyboard, display and cursor control device) to be connected to from one to eight CPU/Memory stations 14 (CPU, main memory and disk drive). A typical configuration might include two CPU/Memory stations and four terminals. The CPU/Memory stations might be in a common area with the terminals placed in individual offices.

The basic multiplexer box 10 is essentially a crossbar switch implemented in "off~ the~shelf"integrated circuits, The switch allows any terminal to be connected to any CPU/Memory station. Each user has a single thumbwheel switch at his terminal which allows him to select which CPU/Memory station the multiplexer connects to his terminal. The thumbwheel switch merely sends out a 3~bitbinary address to control the switching path.

The multiplexer 10 has only a minimal amount of "intelligence,u One function it performs, however, is to route the VIDEO signals from an unused CPU/Memory station 14 (if there is one) to the terminals 12 which are not connected explicitly to a CPU/Memory station 14. This makes it easier for a user to determine whether there is a CPU/Memory station avai...