Browse Prior Art Database

Off Mark for CRT Indicators

IP.com Disclosure Number: IPCOM000089328D
Original Publication Date: 1977-Oct-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 25K

Publishing Venue

IBM

Related People

Nicholson, LW: AUTHOR [+2]

Abstract

Cathode ray tube (CRT) indicators often take the form of lighted rectangular areas. In one mode the indicators are positioned along the right margin of the display area beyond the rows of characters displayed in the confines of the normally utilized rows and columns of dots. Since such positions may be used at the ends of some or all of the character rows, the various positions may or may not be programmed and utilized. The previously utilized mode of using such indicators has been either on or off. The on condition presents no problem, but when the indicator is off, it cannot be ascertained whether the indicator is off or unassigned.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

Off Mark for CRT Indicators

Cathode ray tube (CRT) indicators often take the form of lighted rectangular areas. In one mode the indicators are positioned along the right margin of the display area beyond the rows of characters displayed in the confines of the normally utilized rows and columns of dots. Since such positions may be used at the ends of some or all of the character rows, the various positions may or may not be programmed and utilized. The previously utilized mode of using such indicators has been either on or off. The on condition presents no problem, but when the indicator is off, it cannot be ascertained whether the indicator is off or unassigned.

As illustrated below, the above problem is overcome by using a single horizontal line of dots through the rectangular indicator area to indicate an assigned indicator in an off condition. It is thereby possible to distinguish between an active, assigned, but off, indicator position and an unassigned indicator position which is blank.

1

Page 2 of 2

2

[This page contains 1 picture or other non-text object]