HP 9050 CE Handbook page 20

5-2 9050 Diagnostics
Boot Loader Self-Tests
The boot loader performs the following checks and operations before transferring control to the
operating system.
1. Initializes the 1/0 cards:
a. Looks for a device to display system loader messages (starts with Graphics Display).
b. Checks I/O cards for what is available and where it is located.
c. Turns on I/O card cage LEOs for 112 second.
2. Sends
Loa de r R e
\1_
to the output device.
3. Performs loader I/O self tests:
a. Checks each select code for interface card and status.
b. Checks I/O cards and internal HP-lB for self-test failure.
c. Checks SCM.
d. Checks I/O bus.
e. Checks real time clock 0.1 second register.
4. Outputs "System Loader Message" for failed I/O card self-tests.
a. Failure message is sent to the display device and SCM.
b. Select code channel that failed indicated on I/O card cage LEOs and failure error code is
displayed when reset switch is pressed.
c. No indication on LEOs for failed I/O select code in the I/O expander. Error message is on
the display.
d. This error reporting is for a bad I/O card. Later messages are for peripheral devices.