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Browse Prior Art Database

IPL Status Via Non-Standard Display Method

IP.com Disclosure Number: IPCOM000034721D
Original Publication Date: 1989-Apr-01
Included in the Prior Art Database: 2005-Jan-27
Document File: 3 page(s) / 50K

Publishing Venue

IBM

Related People

Tomfohrde, RP: AUTHOR

Abstract

Software is used to control the CE panel in a non-standard method to display initial program load (IPL) status. The CE panel consists of the following parts (see Fig. 1): A 3-position keylock, (Image Omitted) 5-digit, 7-segment display used to display the selected function and input or output data, 6-function key pad used to select the CE functions, and 4 LEDs used to indicate power, console check, program check, processor check, and output status. The hardware driving the CE control panel consists of the following main parts (see Fig. 2): An 8031 microprocessor controlling the display, Code (located in ROS) executing in 8031 processor which controls the CSP and the CE panel display, and Associated hardware control logic for display and keyboard.

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IPL Status Via Non-Standard Display Method

Software is used to control the CE panel in a non-standard method to display initial program load (IPL) status. The CE panel consists of the following parts (see Fig. 1): A 3-position keylock,

(Image Omitted)

5-digit, 7-segment display used to display the selected

function and input or output data,

6-function key pad used to select the CE functions, and

4 LEDs used to indicate power, console check, program

check, processor check, and output status. The hardware driving the CE control panel consists of the following main parts (see Fig.
2): An 8031 microprocessor controlling the display, Code (located in ROS) executing in 8031 processor which controls the CSP and the CE panel display, and Associated hardware control logic for display and keyboard. The panel processor normally simply displays numeric or hexadecimal characters. The display can be used to display a very limited alpha-character set. The alpha-characters cannot be used to display a meaningful character message or status. The message cannot be translated in different languages. Here, software controls the CE panel to slow a sequenced pattern displaying IPL activity. When the IPL is completed in the CSP, the CSP issues a command to the panel processor to discontinue IPL status display. The software uses the 8031 microprocessor's timer-driven interrupts to display a pre-timed, pre-determined sequenced pattern. The software uses only the top and bottom bars of the seven-segment display. This is opposed to displaying normal numeric or hexadecimal characters. By using only the top and bottom bars, the display remains...