AT&T 6386 Expansion memory boards (argh!)

Dr. Scump aland at infmx.UUCP
Tue Mar 27 11:11:24 AEST 1990


Does anybody have info regarding the memory address map for the socket
on AT&T's "4/16 MB Memory Expansion Board" (PE Code 37337, Comcode
406130534).  What I need is something that will tell me for any
given address, which SIMM does it reside in by socket # and column #.

There is no such documentation with the board.  The machine manual
documents the WRONG BOARD, as I mentioned in prior postings.  Two
calls to the hotline to find out this addressing info has produced
two different answers, both of which have proven to be *wrong*.

Right now, whenever I get an address problem, I have to swap SIMMS
around in an attempt to isolate which socket is the problem. Since
the POST messages typically give the wrong address (or none at all --
sometimes it just stops scanning at a MB boundary with no messages),
this becomes a real adventure.

For example, right now I am confident that the 4th MB is U24 Left
and that U26 Right is the 7th or 8th MB of board addresses...

If some kind soul within AT&T who has access to this info would
care to email/fax or whatever, I'd really appreciate it.  Each
memory error is costing me ~4 hours to isolate...  Email address
below, fax number (415) 926-6872.  Thanks in advance.

--
Alan S. Denney # Informix # aland at informix.com # {pyramid|uunet}!infmx!aland
 CAUTION: Objects in terminal are closer than they appear...
 Disclaimer: These opinions are mine alone.  If I am caught or killed,
             the secretary will disavow any knowledge of my actions.

 "These tests will have no effect on your grades.  They will merely
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