Signal Integrity Test - Old Dell 1400SC - Anyone have a clue?

[Dave Rana]

Can anyone give me any insight on what the MpMemory Signal Integrity 
Test (Integ2) is evaluating?  I'm getting the following:

OS: DOS
Source: MpMemory
Unit Under Test: Memory
Test#: 009
Error#: 001
Revision: 1038
Module: None
Test Name: Signal Integrity Test (Integ2)
Device: System-Memory
Msg: CPU00 Address: 00_4026B020h, Actual: 00000040h,
    Expected: 00000004h

I do this test over and over, and the CPU changes (00 or 01), the 
address changes, but the Actual/Expected is either this pair above, or 
the pair:

Actual: 00100000h, Expected: 000010000h.

I've run memtest for hours and found nothing wrong.  Is this the CPU?  
The North bus?  What am I looking at here?

Thanks in advance for any insight!

Dave.