General
Description
of
Failure
Codes
Table 5-4 shows
the
general meaning of error codes. These codes are explained further in
other
tables. LED
patterns
are represented by a black dot for on
and
a white dot for
off.
Letter
designators indicate
the
LED in
that
position is on or
off,
depending on
the
binary code used
to
represent
the
device
or
failure type.
Table 5-4. General LED Code Failure Indications
LED
Pattern
Failure Indications, via
Upper
Two Bits General Description
of
Failure
State
Indication Only:
Required Device Missing or
DTACK Failure:
Failing Device:
Special Codes (Special Case Highest
Priority Codes):
State
or
Device Codes, Via Lower 6 Bits
Miscellaneous (Highest Priority):
Internal Peripheral Failure (Medium
Priority):
I/O
Card
Failure (Lowest Priority):
State
and
Failure
Codes
00
SS
SSSS
Where
SS
SSSS Indicates
State
of Power-up
O.
DD DDDD
Where DD DDDD Indicates Device
.0
DD DDDD
Where DD DDDD Indicates Device
••••••••
LEDs Never Accessed (or Unused Code)
0
•••••••
LEDs Failed
to
DTACK
00000.0.
Timer
on processor
board
has failed
or
is missing.
xx
00
FFFF
Where
FFFF
indicates Failure (Xs are don't-care
bits)
XX
O.
PPPP
Where
PPPP
is Peripheral Number
XX
• S SSSS
Where S SSSS is Select Code
Table 5-5a is a list of all LED failure codes used in
the
HP
98561 Boot ROM. Codes are listed
here in numerical order for easy reference,
and
then
again in order of occurrence
and
priority.
116
Troubleshooting
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