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Beep Code Description
3-1-3 Master interrupt mask register test in progress or failure. Failure
results in a system halt.
3-1-4 Slave interrupt mask register test in progress or failure. Failure
results in a system halt.
3-2-4 Keyboard controller test in progress or failure. Failure results in a
system halt.
3-3-4 Screen memory test in progress or failure. Failure will result in a
beep code but not a system halt.
3-4-1 Video Retrace Failure.
3-4-2 Screen retrace test in progress.
3-4-3 Screen retrace test failure
4-2-1 Timer-tick interrupt test in progress or failure. An error message is
displayed on the screen. The system does not halt.
4-2-2 Shutdown test in progress or failure. If possible, the BIOS will
continue POST, skipping the memory tests.
4-2-3 Gate A20 failure. An error message is displayed on the screen and
the memory tests are suspended. The system does not halt.
4-2-4 Unexpected interrupt in protected mode. The system does not half
when an unexpected interrupt occurs.
4-3-1 RAM test of memory above 64K in progress or failure. POST will
continue.
4-3-2 Programmable interval timer channel 2 test in progress or failure.
POST will continue.
4-3-4 Real-time clock text in progress
4-4-1 Serial port test in progress or failure. POST will continue.
4-4-2 Parallel port test in progress or failure. POST will continue.
4-4-3 Math coprocessor test in progress or failure. POST will continue.
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