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Browse Prior Art Database

Common Drive for Raster Display and Raster Plotter

IP.com Disclosure Number: IPCOM000080418D
Original Publication Date: 1973-Dec-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Bantz, DF: AUTHOR [+3]

Abstract

A selective format control enables a raster image buffer or refresh memory to be configured alternatively for driving a raster display or a raster plotter as desired, making an appropriate adjustment of matrix size in each case.

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Common Drive for Raster Display and Raster Plotter

A selective format control enables a raster image buffer or refresh memory to be configured alternatively for driving a raster display or a raster plotter as desired, making an appropriate adjustment of matrix size in each case.

In a known type of computer graphics system a vector-raster converter is employed to convert vector data (which normally is employed to drive a vector- graphic or beam-directed display) into raster data suitable for use by a raster display. The raster data produced by the converter is stored in a raster image buffer or refresh memory, which assembles the raster bits into the desired matrix configuration for display purposes.

Sometimes it is desired that a raster plotter be utilized to produce a hard- copy record of the image being displayed. This introduces a problem, in that the display matrix and the plotter matrix have lines of different lengths and are of different heights. The display typically has a matrix of 1000 X 1000 bits, while the plotter typically has a 2000 X 4000 bit matrix. If a buffer configured according to one matrix is used to drive an output device requiring a different matrix, software complications will result.

In accordance with the present proposal, the buifer writing circuitry is arranged so that the buffer is automatically reconfigured under control of a format selector, whenever the output is switched from display to plotter or vice versa. The placement of rast...