Browse Prior Art Database

Double Frequency Blinking Cursor

IP.com Disclosure Number: IPCOM000089327D
Original Publication Date: 1977-Oct-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Nicholson, LW: AUTHOR [+2]

Abstract

When a terminal display is filled with data, the operator may have difficulty in locating the cursor position. To overcome this disability some display devices utilize a blinking cursor to make the cursor position more readily apparent. However, such blinking cursor may still be obscured when a wide variety of screen, row and field attributes are used, effecting various levels of intensity, reverse image and blinking. Therefore, a cursor blink rate of twice the frequency of the normal blink rate has been incorporated into the CRT adaptor design. With the cursor blinking at twice the frequency of the normal attribute blink rate, the ability to distinguish a blinking cursor is maintained.

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Double Frequency Blinking Cursor

When a terminal display is filled with data, the operator may have difficulty in locating the cursor position. To overcome this disability some display devices utilize a blinking cursor to make the cursor position more readily apparent. However, such blinking cursor may still be obscured when a wide variety of screen, row and field attributes are used, effecting various levels of intensity, reverse image and blinking. Therefore, a cursor blink rate of twice the frequency of the normal blink rate has been incorporated into the CRT adaptor design. With the cursor blinking at twice the frequency of the normal attribute blink rate, the ability to distinguish a blinking cursor is maintained.

The figure illustrates a CRT circuit using an input dot rate with various divide circuits to establish the horizontal and vertical drive signals. The blink counter is a function of the vertical count decode with a double frequency cursor blink rate and a normal blink rate for the character or data portions of the display.

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