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Using a 3-Digit Display for Displaying a Sequence of 3-Digit Codes

IP.com Disclosure Number: IPCOM000102650D
Original Publication Date: 1990-Dec-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 2 page(s) / 76K

Publishing Venue

IBM

Related People

Benignus, DM: AUTHOR [+3]

Abstract

A method is described which uses the 3-Digit Display to report problems that require more than 3 digits of information.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Using a 3-Digit Display for Displaying a Sequence of 3-Digit Codes

       A method is described which uses the 3-Digit Display to
report problems that require more than 3 digits of information.

      A 3-Digit Display is provided on the IBM RISC System/6000*
system.  It is used to show progress and report problems during tests
that are performed at power-on, configuration, and when a good
graphics or terminal display is not available.  Most of the above
cases are handled via a single 3-digit code.  There are several cases
which require more than 3 digits of information to be display.  The
cases are:
-    During power-on test when a memory problem is detected. When a
memory problem is detected the memory type and location must be
identified.
-    During diagnostic testing when no known good console is
available.  The failing part and its location must be identified.
-    When a system crash occurs. The type of crash needs to be
identified.

      On IBM RISC System/6000 the 3-Digit Display and the Reset
Button are controlled by the On-Card-Sequencer microprocessor (8051).
Initially only a single set of 3 digits of information could be
displayed and the Reset Button was used only to reset the system.

      The method chosen to display the information is to put a
flashing '888' in the 3-Digit Display to signal that information is
available to be displayed.  The reset button is used to cycle through
the numbers so the numbers can be easily recorded.

      The implementation for this procedure is to enhance the
functions of the On-Card-Sequencer microprocessor.  An area in
non-volatile memory is defined to store the sequence of data that is
to be displayed in the 3-Digit Display.  This area is called the
Non-Volatile Memory 3- Digit Display Save Area.  A bit in
non-volatile memory is defined to control the mode...