Service manual

PN 4237242C
C.3-1
MESSAGE/ERROR CODE LISTINGS
AMIBIOS BEEP CODES
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C.3 AMIBIOS BEEP CODES
Beep codes (Table C.3-1) are errors found during the first stage of the Power On Self Test
(POST). All beep code errors except beep code 8 are fatal errors. A fatal error does not allow
the boot process to continue.
Errors occurring after this phase are non fatal and are displayed to a computer monitor. The
MD II’s display is not a computer monitor and is driven by the system software and hardware.
Since the software is loaded after the boot process is complete, the instrument cannot display
these non-fatal error messages.
Table C.3-1 AT Motherboard AMIBIOS Beep Codes
Beeps Error Message Description
1
Refresh Failure
The Memory Refresh circuitry on the motherboard is faulty.
2
Parity Error
The system detected a parity error in base memory.
3
Base 64 KB Memory Failure
The system detected a memory failure in the first 64 KB of memory.
4
Timer Not Operational
The system detected a memory failure in base memory or Timer 1 on the
motherboard is not functioning.
5
Processor Error
The CPU on the motherboard generated an error.
6
8042 - Gate A20 Failure
The CPU is unable to switch to protected mode. Gate A20 on the keyboard
controller (8042) allows the CPU to operate in protected mode.
7
Processor Exception Interrupt
Error
The CPU generated an exception interrupt.
8
Display Memory Read/Write Error
The system video adapter is either missing or its memory is faulty. This is
not a fatal error.
9
ROM Checksum Error
The ROM checksum value does not match the value in BIOS.
10
CMOS Shutdown Register
Read/Write Error
The shutdown register for CMOS RAM has failed.
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