Technical data
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.