Browse Prior Art Database

Locally Selectable Screen Display Formats

IP.com Disclosure Number: IPCOM000061408D
Original Publication Date: 1986-Jun-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Smith, TJ: AUTHOR [+2]

Abstract

Display work stations or monitors often times have the capability of displaying different screen formats such as 24 rows by 80 columns or 27 rows by 132 columns. Some are capable of displaying one of four different screen formats: 24 x 80, 32 x 80, 43 x 80, or 27 x 132. The ability to display these screen formats is based on both the digital logic that generates the sync and video signals into a series of dots and uses the horizontal and vertical signals to provide a stable display.

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Locally Selectable Screen Display Formats

Display work stations or monitors often times have the capability of displaying different screen formats such as 24 rows by 80 columns or 27 rows by 132 columns. Some are capable of displaying one of four different screen formats: 24 x 80, 32 x 80, 43 x 80, or 27 x 132. The ability to display these screen formats is based on both the digital logic that generates the sync and video signals into a series of dots and uses the horizontal and vertical signals to provide a stable display.

During manufacture and test, the resident diagnostics do a thorough job of testing all of the video logic that supports each of the different screen formats. However, the resident diagnostics cannot verify correct operation of the CRT monitor and its supporting circuitry. For this reason, a visual inspection for correct operation of the CRT monitor must be performed. Originally, the visual inspection and adjustment of the monitor was only done while the work station was in 24 x 80 mode. That procedure turned out invalid because on other display screen formats the monitor would not always sync up and the result, often times, was a rolling screen. Manufacturing adjusted their procedure to include all of the available display formats. However, any display screen format other than the 24 x 80 mode does not appear until the display work station goes 'online'. Further, the screen format cannot be changed while 'online', e.g., screen format cannot be changed from 24 x 80 mode to 43 x 80 mode after the sign-on screen is displayed. To change f...