Browse Prior Art Database

REMOTING OF BIT MAP RASTER SCAN CRT

IP.com Disclosure Number: IPCOM000024008D
Original Publication Date: 1979-Jun-30
Included in the Prior Art Database: 2004-Apr-01
Document File: 2 page(s) / 247K

Publishing Venue

Xerox Disclosure Journal

Abstract

The major problem encountered with remoting a bit map raster scan CRT monitor is how to handle the large amounts of data (digital bits) on the video line. The video signal provides the CRT monitor with bit information during a scan on

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XEROX DISCLOSURE JOURNAL

REMOTING OF BIT MAP RASTER SCAN CRT
Charles Anthony
Frank Brinckerhoff

Proposed Classification U,S~CL 340/324

mt. CL G08b 23/00

LOCATED WITH RASTER SCAN BIT MAP CRT MEMORY
AND CONTROLLER.

HOR I ZONTAL SYNC SIGNAL

VERTICAL SYNC SIGNAL

000 FEET MAX

LOCATED WITH RASTER

I SCAN CRTAND

ANALOG CONTFOLS.

~ OHMS H SYNC

V SYNC

~Th OHMS VIDEO

Eli'

I "COAX CABLE

TYPE RGII/Lt

The major problem encountered with remoting a bit map raster scan CRT monitor

is how to handle the large amounts of data (digital bits) on the video line. The video signal provides the CRT monitor with bit information during a scan on

whether a raster is blanked or unbianked, A typical raster scan CRT can have 600 points (rasters) horizontally (per scan line) and 800 scan lines or a total of 480,000 points (rasters). If the CRT were refreshed 60 times per second the worst case digital data rate for the video signal would be:

480,000 rasters x 60/2 = 14~4mega cycles

The drawing discloses circuits for remoting a CRT which requires a worse case digital video signal of 14.4 mega cycles. The devices labelled (j~are 8T13 monolithic line drivers capable of driving 50 ohm or 75 ohm coaxial transmission

lines~ The devices labelled 2 are 8T14 line receivers for digital transmissions over long lengths of coaxial cab e.

Volume 4 Number 3 May/3une 1979 369

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XEROX DISCLOSURE 3OURNAL

370 Volume 4 Number 3 May/June 1979

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