Diagnostics
DAC Check - Checks the digital-to-analog converter in the VGA subsystem when the optional CRT Adaptor
is installed.
Attribute Check - Displays 16 foreground, 8 background, and 8 blinking shades of gray.
Character Set Check - Displays characters on the screen normally on an 80-by-25 text mode display.
Run All Checks - Runs all four checks above in sequence.
Liquid Crystal Display
This test checks the computer's LCD screen. Two test patterns are displayed-a checkered pattern and a
striped pattern. Any defect in either pattern indicates a faulty screen.
Floppy Drive Unit
Note: This test is effective only when the optional Floppy Drive Unit is attached to the computer.
This test reads and writes data continuously to a floppy in the optional Floppy Drive Unit to test the
read/write functions of the drive. After selecting the test, the floppy drive submenu is displayed with the
following categories:
Caution: As the write-read check may erase data from the floppy in the drive under test, use a
blank floppy or one containing data that you no longer need.
Read Check - Checks that data can be read from the floppy without errors. If an error is detected, the test
stops and an error message is displayed.
Write-read Check - Checks if data can be written/read correctly by comparing data written to the floppy
with data read from the floppy. This test destroys all existing data on the floppy. If an error is detected, the
test stops and an error message is displayed.
Diagnostics E-5