Chapter 8 BIOS ROM
Compaq Deskpro 4000N and 4000S Personal Computers
First Edition - September 1997
8-14
ENTRY: AX = E827h
BH = 02h
RETURN: CF = 0 (Success)
AH = 0
BX = 0000h (if no single bit ECC corrected error has occurred)
bit <0>, Error occurred on DIMM/SIMM pair 0
bit <1>, Error occurred on DIMM/SIMM pair 1
bit <2>, Error occurred on DIMM/SIMM pair 2
bit <3>, Error occurred on DIMM/SIMM pair 3
CF = 1 (Failure)
AH = 86h (Not supported)
The POST memory test checks for ECC-corrected single bit errors after each 64K of memory
tested in a similar fashion as is done with parity. The errors are counted on a per DIMM basis
and notify the user at the end of the test in the following format:
“207-ECC Corrected Single Bit Errors in DIMM/SIMM Pair(s) x,x…”
x = DIMM/SIMM pair numbers 0 through 3.
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