Running the Dell Diagnostics
4-17
Interrupt Controller Test
Generates an interrupt on each interrupt request (IRQ) line to verify that devices
using that line can communicate with the microprocessor and that the interrupt
controller sends the correct memory addresses to the microprocessor.
System Speaker Test
Checks the functionality of the speaker by generating eight tones.
Coprocessor Calculation Test
Checks the use of different types of numbers and the math coprocessor’s ability
to calculate correctly.
Coprocessor Error Exception Test
Verifies the math coprocessor’s ability to handle errors and to send IRQs to the
microprocessor.
PCMCIA Test
Checks the functionality of the PC Card controller on the system board.
USB Register Test
Checks the onboard registers of the universal serial bus (USB) interface. This sub-
test does not test USB peripherals.
USB Memory Structure Test
Tests the USB controller’s ability to access and understand standard USB data in
system memory.
Temperature Range Test
Verifies that the temperature sensor is within the minimum/maximum range and
that the sensor can detect change.
Fan On/Off Test
Verifies the fan’s cooling ability, and that it can be turned off and on.
Battery Charger Test
Verifies that the battery charger produces a voltage and that the battery holds a
charge.
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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
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