FIC A360 service manual Troubleshooting and Repair, 3 d BIOS Beep Codes

Troubleshooting and Repair

Table 6-3 (d) BIOS Beep Codes

Beep	Diagnostic	Description	Test Performed
Code	Code
4-2-3	36h	Gate A20 failure.	To test extended memory, the processor
			must be placed in protected mode and
			the A20 line must be enabled. For the
			memory tests, the BIOS generally uses
			the keyboard controller to enable A20. If
			the A20 line is not properly set during the
			memory test, an error message is
			displayed on the screen and the memory
			test are suspended. The system does
			not halt.
4-2-4	37h	Unexpected interrupt in	During the memory tests, the processor
		protected mode.	is placed in protected mode. All
			interrupts in the interrupt descriptor table
			are initialized to point to special handler
			that displays a message on the screen.
			All hardware interrupt are disabled. The
			system does not halt when an
			unexpected interrupt occurs.
4-3-1	38h	RAM test of memory above	The memory above the first 64K is tested
		64K in progress or failure.	with a rolling ones test and a pattern test.
			All success and failure messages are
			displayed on the screen and POST will
			continue.
4-3-2	3Ah	Programmable interval timer	Over a period of time, the current count
		channel 2 test in progress or	values in timer 2 are read and
		failure.	accumulated by ORing them into the
			values read so far. It is expected that
			during the time period, all bits will be set.
			If an error is detected, an error message
			will be displayed on the screen and
			POST will continue.
4-3-4	3Bh	Real-time clock test in	Over a period of time, the Update-In-
		progress or failure.	Progress bit of Status Register A of the
			real-time clock is read and tested. The bit
			should toggle from 0 to 1 within the time
			period.
4-4-1	3Ch	Serial port test in progress or	Pattern test of one or more of the
		failure.	installed serial ports. If a failure is
			detected, an error message will be
			displayed and POST will continue.
4-4-2	3Dh	Parallel port test in progress	Rolling ones test is done to one or more
		or failure.	of the installed parallel ports. If a failure
			is detected, an error message will be
			displayed and POST will continue.
4-4-3	3Eh	Math coprocessor test in	An integer load and store is performed
		progress or failure.	with the math coprocessor. If the values
			do not match, an error message will be
			displayed and POST will continue.

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