Technical data

Fault Isolation 4-53

4.10.1 Self Test Control Menu

A Self Test Controls menu has three columns to provide you with these controls:

• Keys — the keyboard keys used to select the test option you want to run

• Test Option — the type of test to run

• Selected — indicates the yes/no (Y/N) status of the option

The next few subsections explain each Self-Test Controls Menu.

Continuous Self-Tests

Continuous Self-Tests cause the Boot ROM to continuously repeat the self-tests. En-

tering conﬁgure mode while already in continuous self-test mode and choosing the

Continuous option stops the continuous self-test and causes the Boot ROM to resume

normal operation.

While in continuous mode, the Boot ROM does not wait or stop for most failures. It

just continues looping through self-test. The following failures do stop self-test loop

ing:

• A memory failure in the top 16 KB of memory. The Boot ROM stops with the

display blanked.

• Boot ROM checksum failure. The Boot ROM stops with these messages dis

played:

CONTINUE AT OWN RISK

RETURN To Continue

• Something in the Boot ROM has changed. It may have a bad instruction or it

cannot execute instructions properly. If you continue, something may not work

correctly. Either the CPU or emulator board should be replaced.

• Typing < Return > causes the Boot ROM to continue self-test looping.