GCFA · Question #105
Which of the following diagnostic codes sent by POST to the internal port h80 refers to the system board error?
The correct answer is B. 100 to 199. POST diagnostic codes in the 100-199 range indicate a system board (motherboard) error during Power-On Self-Test.
Question
Which of the following diagnostic codes sent by POST to the internal port h80 refers to the system board error?
Options
- A200 to 299
- B100 to 199
- C400 to 499
- D300 to 399
How the community answered
(42 responses)- A7% (3)
- B71% (30)
- C5% (2)
- D17% (7)
Why each option
POST diagnostic codes in the 100-199 range indicate a system board (motherboard) error during Power-On Self-Test.
Codes 200-299 are assigned to RAM or memory errors, not system board errors.
IBM PC BIOS POST standards assign codes 100-199 to system board errors, indicating a fault detected during the self-test of the motherboard and its core logic. When a code in this range appears, technicians know to investigate the system board itself rather than peripheral components. This numbering convention has been the standard across IBM-compatible PC diagnostics.
Codes 400-499 are assigned to monochrome display adapter or printer port errors, not system board errors.
Codes 300-399 are assigned to keyboard controller errors, not system board errors.
Concept tested: POST diagnostic error code ranges by component
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