Technical data

Self-Test Descriptions, Continued
DZ Self-Test (T
3)
The DZ self-test tests the serial line controller.
Setup Notes
The DZ Interrupt test fails in the Digital Services or
manufacturing environments if no external loopbacks are
present on the communication port.
The mouse test fails if the mouse is not plugged in and the
console is a video device.
The LK401 test fails if the LK401 is not plugged in and the
console is a video device.
A keyboard and pointing device must be plugged in, or an
error is reported.
When you are in the Digital Services or manufacturing
environments, loopbacks must be used on the standard
communications port.
The following tests are included:
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 the line
parameters do not get set up correctly.
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 out the lines that are not being used by the console
device. The characters are expected to be looped back.
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