Cause Keyboard Controller Test failure
Code 3-3-1
Cause NVRAM power loss
Code 3-3-2
Cause NVRAM configuration
Code 3-3-4
Cause Video Memory Test failure
Code 3-4-1
Cause Screen initialization failure
Code 3-4-2
Cause Screen retrace failure
Code 3-4-3
Cause Search for video ROM failure
Code 4–2–1
Cause No time tick
Code 4–2–2
Cause Shutdown failure
Code 4–2–3
Cause Gate A20 failure
Code 4–2–4
Cause Unexpected interrupt in protected mode
Code 4–3–1
Cause Memory failure above address 0FFFFh
Code 4–3–3
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