Technical data

Table 2–6 lists the tests that are included in the DZ self-test.
Table 2–6 DZ Self-Test (3)
Self-Test Function
Reset test Resets the DZ chip and sets up its lines to their default values.
An error occurs if the device does not reset or if the line parameters
do not get set up properly.
Polled test Tests each line in the internal loopback mode by using the chip in
the polled mode.
Characters are transmitted out a line and are expected to be looped
back.
Interrupt test Tests each line running interrupt driven.
If the diagnostic environment is Digital Services or manufacturing,
the lines are tested using an external loopback device on the
communication port.
Interrupts are disabled and characters are sent through the lines
that are not being used by the console device.
The characters are expected to be looped back.
LK401 test Checks for the presence of an LK401 when the console device is a
video device.
Mouse test Checks for the presence of a mouse when the console device is a
video device.
Refer to Section A.2.2 for a list of the DZ self-test error codes and to Section B.7
for a list of the DZ diagnostic LED codes.
Diagnostic Testing 2–15