HP 300

The output human interface soft vectors are set up to to handle the video output circuits
or dumrny display drivers are set up if no video circuits are present. If alpha video output
circuits are present, then a memory test of the alpha, and highlight memories is executed.
If bit-map video output circuits are present, then its ID /FONT ROM is checksummed
and the circuits are initialized and cleared. If a failure is discovered it is indicated on the
LEDs and the problem is remembered in F _AREA. The message SELF-TEST MODE is shown
on
the bottom line of the display. See the section on Human Interface for the console
selection algorithms.
6. Display Copyright Notice:
The Boot ROM displays a 1985 copyright message.
7. Boot ROM Checksum:
If the Boot ROM checksums successfully, then the Boot ROM version (BOOTROM Rev. A)
is displayed, otherwise the message BOOTROM Rev. A Failed will be displayed. If there
was a video circuit memory failure discovered in the alpha display initialization and test
routine, then it will be shown on the display as:
Memory Failed at <Hex-Address>
(W:<Hex-Write-Pattern>, R:<Hex-Read-Pattern»
The addresses and data indicate "nl0vep.l" values.
8. Identify Floating Point Hardware.
A search is
made for the MC98881 Coprocessor and the HP 98635A Floating Point Card.
If either is present, it is identified but not tested.
9. Initialize, and Test Keyboard Electronics:
The keyboard human interface vectors are set up for the processor's keyboard electronics,
if present,
and their self-test value is checked. If the keyboard electronics failed self-test,
then Keyboard Failed is displayed and the appropriate error code is sent to the LEDs
and the beeper. If the processor's keyboard interface is present and passed self-test, then
the message Keyboard is displayed.
If no processor keyboard electronics are present, then the external I/O space is searched for
accessory
card keyboard electronics (for the HP 98700A). If found, it is treated the same
as
the processor keyboard electronics except that the message Keyboard at 8 (where X
is the select code of the accessory card keyboard electronics) is displayed if the keyboard
passes self-test,
and the nlessage Console Keyboard at XX Failed is displayed if it fails
self-test.
NOTE
Note that only the I/O card keyboard electronics chosen as console
keyboard will
be tested. Several seconds are required to identify the
console keyboard. Other keyboard electronics in I/O slots will be iden-
tified,
but not tested.
Boot Rom Functions 87
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