Texas Instruments TravelMate 4000M User Reference Manual page 244

Diagnostics
Additional Diagnostics
The Diagnostics Program hard disk tests are all
nondestructive except on the diagnostics cylinder. The tests
perform seek tests, head tests, and controller tests, but do
not perform read/write tests on the entire media.
Additional tests for the hard disk are contained in the hard
disk format system, which is described later in this
appendix.
Sound Diagnostics
To check Sound, select sound from the Windows Control
Panel. Select Test to see if sound is on.
Diagnostics Error Codes
When an error is detected by the Diagnostics Program, a
two-byte hexadecimal code is displayed. The first byte is the
class of the error and the second byte is the subclass. The
error code class generally corresponds to a specific
hardware system or group of hardware systems. For
example, class one (01) is used for the system planar board.
The last byte of the code (subclass) describes the actual test
that failed on the specified peripheral. For example, error
0108 indicates that the 8253 counter test failed during the
system planar board test.
D-6 Diagnostics