Browse Prior Art Database

Vector Mode Adapter for Plotting

IP.com Disclosure Number: IPCOM000092999D
Original Publication Date: 1967-Apr-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Johnson, ET: AUTHOR

Abstract

This adapter accepts digital coordinate display data as it appears at a communication terminal for application to either a digital plotter or an analog plotter. It is also applicable to a storage cathode ray tube oscilloscope monitor. A plot is advanced in both directions in synchronization. Unequal advances result in a plot moving at the 45 degrees angle and thence at the 0 degree or 90 degrees angle, for example, A to C to D in the inset.

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Vector Mode Adapter for Plotting

This adapter accepts digital coordinate display data as it appears at a communication terminal for application to either a digital plotter or an analog plotter. It is also applicable to a storage cathode ray tube oscilloscope monitor. A plot is advanced in both directions in synchronization. Unequal advances result in a plot moving at the 45 degrees angle and thence at the 0 degree or 90 degrees angle, for example, A to C to D in the inset.

Start X and Y points are loaded and stored in the counters. Vector direction information sets the X and Y counters individually to count up or down. The X and Y end points are then loaded into the registers. Counting proceeds in either X or Y or both until a compare between the counter and register is made individually in either X or Y or both.

This adapter is asynchronous. It can be driven at various low or very fast rates. Only a minimum of information is required to draw lines so that the transmission data required and the time required are both greatly reduced. By varying the count step size, it is possible to automatically scale a plot by an integer factor, or to allow more vector directions, or to allow for adjustments in resolution and transmission speed.

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