HP 9000 Series 310 Service Information Manual page 100

The Boot ROM searches the ROM space from 64K bytes to 4 Mbytes. For each ROM
header found, that ROM is checksummed unless the checksum disable bit is set. ROMs
which fail checksum are indicated on the LEDs and the message
ROM X at <address>
Failed
is displayed. Any ROM which supports only 50 character wide alpha video will
be ignored, and the message
ROM X at <address> Ignored
will be displayed, and the
appropriate value will be sent to the LEDs.
19. Test RAM:
The nlessage
TESTING MEMORY
is displayed on the last line of the display, and the rest of
memory is tested.
20. Set Up Memory:
The nlessage
SELF-TEST MODE
is printed on the last line of the display. If a memory
failure occurred, then the appropriate value is sent to the LEDs and following message is
displayed:
Memory Failed at <Hex-Address>
(W:<Hex-Write-Pattern>, R:<Hex-Read-Pattern»
After a failure the Boot ROM drops back to the next 64K byte boundary, unless the
failure was is in the top 64K, in which case the Boot ROM drops back to the next 2K
boundary. The global Boot ROM variables are set up. Available RAM is displayed as
a base ten number in bytes. The amount of RAM available should equal the amount of
RAM installed minus 164 bytes.
For example if one HP 98257 RAM card was installed in a computer's accessory slot and a
98561-66511 processor is in a system slot, the amount of RAM displayed would be
1572906
Bytes.
21. Allocate Memory:
Temporary memory is set up for the Boot scanner and Booter routines.
22. Display Final LED value:
If an error occurred during self-test, then the appropriate value will be sent to the LEDs
and sounded off on the beeper. The lower seven bits of LED value are sounded off (MSB
first) with ones represented by high frequency long notes and zeros represented by low
frequency short notes. If a Boot ROM checksum error has occurred, then the Boot ROM
will stop execution with the message
CONTINUE AT OWN RISK (RETURN To Continue)
on the
bottonl line of the display. The Boot ROM will continue if the I
Return
I
key is pressed. If an
error has occurred and continuous self-test looping is not enabled, and the error was not
a Boot ROM checksum error, then the Boot ROM will wait one minute for the monitor
to warm up before continuing, and will display the message
WAITING 1 MINUTE (RETURN
To Abort Wai t).
Pressing the
I
Return
I
key will cause the Boot ROM to abort the one
minute wait and continue.
90 Boot Rom Functions