Browse Prior Art Database

Diagnostic Error Display

IP.com Disclosure Number: IPCOM000087263D
Original Publication Date: 1977-Jan-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 59K

Publishing Venue

IBM

Related People

Crandall, DR: AUTHOR [+2]

Abstract

Many prior data processing machines have included off-line, self-contained diagnostic programming, but there has been a noticeable lack of an adequate display of the results of the diagnostic program. All of these machines have some operating indicator lights, perhaps as few as three or four, which have no function in the diagnostic program. This description shows how these lights may be used to display the results of a diagnostic program. Since there usually will be many more status bits in the diagnostic results than there are indicator lights, the display program is arranged to present successive groups of the result bits.

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Diagnostic Error Display

Many prior data processing machines have included off-line, self-contained diagnostic programming, but there has been a noticeable lack of an adequate display of the results of the diagnostic program. All of these machines have some operating indicator lights, perhaps as few as three or four, which have no function in the diagnostic program. This description shows how these lights may be used to display the results of a diagnostic program. Since there usually will be many more status bits in the diagnostic results than there are indicator lights, the display program is arranged to present successive groups of the result bits.

As indicated in the figure, the display program will start at a test 1 at the end of a diagnostic program to see if there was an error. If so, the conventional error lights will be displayed (block 2) and the system awaits further instructions. A group of three switches (blocks 3, 4, and 5) give further instructions. Switch 1 when depressed will exit the program to continue operations. Switch 2 can be used after a display has started to repeat the display from the beginning, and switch 3, when operated, will shift the display to a succeeding group of bits.

In effect, the display program is a repetitive sequence where a bit group is displayed and the program waits for the next operation of switch 3. The sequence includes a block 6 to select the next group of status bits to be displayed, and a block 7 to display the bi...