HP OmniBook 800CT Service Manual page 24

Message
KEYBOARD FAILURE
MACHINE IS LOCKED - TURN KEY
NO BOOTABLE FLOPPY DRIVE 0 INSTALLED
NO INTERRUPTS FROM TIMER 0
RAM PARITY ERROR AT LOCATION xxxx
ROM AT xxxx (LENGTH YYYY) WITH NON-ZERO
CHECKSUM (zz)
TIME/DATE CORRUPT - RUN SCU
UNEXPECTED AMOUNT OF MEMORY - RUN SCU The amount of memory detected by
CMOS RAM TEST FAILED
DMA CONTROLLER FAULTY
FAULTY DMA PAGE REGISTERS
FAULTY REFRESH CIRCUIT
INTERRUPT CONTROLLER FAILED
ROM CHECKSUM INCORRECT
6
Possible Cause
The keyboard failed to respond to the
RESET ID Command.
The system will not continue the boot
sequence until you insert the key into the
key lock and turn it.
No bootable floppy drive was detected.
Possible solutions: 1) Power down the
system and check all appropriate
connections, cables, etc. 2) In
configurations where no floppy drive is
installed, run System Configuration Utility
and make sure the diskette drive
configuration item is set to "None". 3)
Replace the diskette drive if necessary.
The periodic timer interrupt is not
occurring.
A RAM parity error occurred at the
specified (hexadecimal) location.
An illegal adapter ROM was located at
the specified address. An external
adapter (such as a video card) may be
causing a conflict.
The time and date stored in the real time
clock have been corrupted, possibly by a
power loss.
POST does not match the amount
specified in CMOS RAM.
A walking built test of CMOS RAM
locations 0E (Hex) - 3F (Hex) failed.
A sequential read/write of the transfer
count and transfer address registers
within the primary and secondary DMA
controllers failed.
A walking bit read/write of the 16 DMA
controller page registers starting at
location 80 Hex failed.
A continuous read/write test of port 61h
found that bit 4 (Refresh Detect) failed to
toggle within an allotted amount of time.
A sequential read/write of various
Interrupt Controller registers failed.
A checksum of the ROM BIOS does not
match the byte value at F000:FFFF.