Successful Power-Up Self-Tests; Level 0 Tests - DEC VT1000 Service Manual

If a test finds an error:
1. Record the error code.
2. Find the error code and suggested solution in Table 3–1.
3. Repeat the tests in this chapter to ensure the terminal operates
correctly.
The terminal will not service any interrupts or commands, except as
necessary to perform testing.

2.1.1 Successful Power-Up Self-Tests

Power-up self-tests run each time you turn on the power switch on the
system box. There are two levels of power-up self-tests —level 0 and
level 1. Level 0 tests run first, followed by level 1 tests. Failure of some
power-up tests may prevent the terminals from running.
Level 0 Testing
When you turn on the terminal, level 0 testing begins. When level 0
testing completes successfully (within 5 seconds), the operating system
starts and level 1 testing begins automatically.
Table 2–1 lists the eight level 0 tests.
Table 2–1 Level 0 Tests
Simple CPU test
ROM checksum test
RAM test
Interrupt test
Level 1 Testing
Level 1 testing begins by displaying various patterns on the screen.
Next, a pie graph display appears to indicate the progress of level 1
testing. As each test finishes, a segment of the pie fills in.
When level 1 testing completes successfully (within 25 seconds of power-
up):
• The keyboard bell rings.
• The keyboard LEDs turn off.
Video control register test
I/O data path test
Illegal monitor test
Ethernet port (LANCE) not reset on power-
up test
Testing 11