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Beep Codes and Error Messages 3-5
Diskette sub-
system reset
failed
System could not suc-
cessfully issue reset
command to diskette
controller.
Faulty diskette/tape drive
controller (defective sys-
tem board).
Diskette
write pro-
tected
Diskette write-protect
feature activated.
Diskette write-protected.
Drive not
ready
Diskette missing from
or improperly inserted
in diskette drive.
Missing, defective, unfor-
matted, or improperly
inserted diskette.
Gate A20 fail-
ure
Gate A20 of the
keyboard controller
malfunctioned.
Faulty keyboard control-
ler (defective system
board).
General fail-
ure
Operating system can-
not execute command.
Operating system cor-
rupted or not installed
properly.
Hard disk
controller
failure
Hard disk
drive read
failure
Hard disk
failure
Hard-disk drive failed to
initialize.
Incorrect configuration
settings in System Setup
program, improperly con-
nected hard-disk drive
cable, faulty hard-disk
controller subsystem
(defective system board),
or loose power cable.
Incompatible
Processor:
CPU0 is B0
step or below
Incompatible
Processor:
CPU1 is B0
step or below
Unsupported version of
microprocessor installed
on system board.
Unsupported micro-
processor installed.
Incompatible
Processors:
Cache sizes
different
In a dual-processor
system both micro-
processors do not have
the same level-2 cache.
Microprocessors do not
have the same level-2
cache.
Table 3-2. System Error Messages
(continued)
Message Definition Probable Causes