Users Guide

The System Set subtests double-check many system board components, such as the computer's I/O circuitry, that are
tested by other test groups or subtests in the diagnostics. You should run the System Set test group if you are having a
problem and cannot isolate the failure or malfunction to a particular system board component.
The System Set test group also verifies the proper operation of other computer components, such as the speaker, that are
not tested elsewhere in the diagnostics.
The following symptoms usually suggest a problem with a component or subassembly that warrants running a System
Set subtest:
A program is not running as usual, or a proven piece of software appears to malfunction and you confirm that the
software itself is not at fault. (You can confirm that the software is functioning properly by moving it to another
computer and running it there.)
An option card you previously accessed can no longer be accessed.
You get a parity error or page fault failure—any error message that contains the word[s] parity or page fault—at
any time during operation. These errors are usually accompanied by a reference to an address, which you should
record on a copy of the Diagnostics Checklist found in Getting Help.
Correcting errors in the system configuration information in the System Setup program does not resolve a
problem.
The computer's clock/calendar stops.
The speaker no longer functions. The problem could be a failure of the system timers as well as a failure of the
speaker itself. Run the System Timers test, followed by the System Speaker test.
A peripheral device appears to malfunction. Run the Interrupt Controllers test.
A spreadsheet program or other type of mathematical application runs abnormally slow, generates error messages
concerning calculations or operations, runs incorrectly, or generates incorrect results, or a proven piece of the
program appears to malfunction and you confirm that the software itself is not at fault. (You can confirm that the
software is not at fault by moving the program to another computer and running it there.)
The computer periodically locks up, especially at different places and times in different programs.
The computer halts in the middle of performing calculations or complex mathematical operations.
Video Test Group
The subtests in the Video test group verify the proper operation of the video controller and the video control circuitry
installed in the computer. These subtests check for the correct operation of the readable registers in the video circuitry
and the controller. They write, read, and verify data patterns in the cursor registers of the controller. The Video test
group also tests all the video memory and provides additional subtests to test the color features of a color monitor.
Subtests
The eight subtests in the Video test group and the video functions they test follow:
Video Memory Test
Checks the read/write capability of video memory in various video modes.
Video Hardware Test
Checks the cursor registers and the horizontal and vertical retrace bit registers in the video controller.
Text Mode Character Test
Checks the video subsystem's ability to present data in text modes.