Browse Prior Art Database

Control of Speed of Cursor Movement

IP.com Disclosure Number: IPCOM000034299D
Original Publication Date: 1989-Jan-01
Included in the Prior Art Database: 2005-Jan-27
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Fujisawa, H: AUTHOR [+3]

Abstract

Disclosed is a control circuit which controls the speed of cursor movement. A display screen of a display terminal has a fixed display area. Characters are displayed in the display area in various display mode, e.g. 24x80, 32x80, 43x80 and 27x132 characters. The cursor is continuously moved on the display area in response to a depression and holding of the cursor move key. When an operator switches the display mode from 24x80 to 43x80, he can see large numbers of characters in the display area. But, the speed of cursor movement to a specific character position becomes slow. It is required, therefore, to adjust or control the speed of the cursor movement at appropriate speed to the selected mode. Referring to the figure, a table is provided which stores count values for the display modes.

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Control of Speed of Cursor Movement

Disclosed is a control circuit which controls the speed of cursor movement. A display screen of a display terminal has a fixed display area. Characters are displayed in the display area in various display mode, e.g. 24x80, 32x80, 43x80 and 27x132 characters. The cursor is continuously moved on the display area in response to a depression and holding of the cursor move key. When an operator switches the display mode from 24x80 to 43x80, he can see large numbers of characters in the display area. But, the speed of cursor movement to a specific character position becomes slow. It is required, therefore, to adjust or control the speed of the cursor movement at appropriate speed to the selected mode. Referring to the figure, a table is provided which stores count values for the display modes. When the display terminal operates in the 43x80 character mode, the speed of the cursor movement is controlled in the following manner. In response to the depression of the cursor move key, the first cursor code is generated. A value "4" in the table is supplied to a decremental counter. Timing of the decrement operations is controlled by timing pulses. When the value in the decremental counter is decremented to "0", the second cursor code is generated. The period between the first and second cursor codes determines the speed of the cursor movement. The above operations are repeated until the cursor move key is released.

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