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A-9
:
If the BIOS detects error 2C, 2E, or 30 (base 512K RAM error), it displays an additional
word-bitmap (
xxxx) indicating the address line or bits that failed. For example, “2C 0002”
means address line 1 (bit one set) has failed. “2E 1020" means data bits 12 and 5 (bits
12 and 5 set) have failed in the lower 16 bits. The BIOS also sends the bitmap to the
port-80 LED display. It first displays the checkpoint code, followed by a delay, the
high-order byte, another delay, and then the low order byte of the error. It repeats this
sequence continuously.
F2h Initialize video
F3h Initialize System Management Manager
F4h Output one beep
F5h Clear Huge Segment
F6h Boot to Mini DOS
F7h Boot to Full DOS
Table A-3. Boot Block Flash ROM Terminal POST Errors (Continued)
Post Code Description