Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!cs.utexas.edu!tut.cis.ohio-state.edu!att!cbnewsl!rubin From: rubin@cbnewsl.ATT.COM (michael.rubin) Newsgroups: comp.sys.att Subject: Re: AT&T 6386 Expansion memory boards (argh!) Message-ID: <4840@cbnewsl.ATT.COM> Date: 29 Mar 90 20:33:32 GMT References: <3701@infmx.UUCP> Reply-To: rubin@cbnewsl.ATT.COM (michael.rubin,sf,) Distribution: na Organization: AT&T Bell Laboratories Lines: 27 In article <3701@infmx.UUCP> aland@infmx.UUCP (alan denney) writes: >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 #. The 4-16 MB memory boards in my 6386 may be different from yours since the sockets are not marked "U24", "U26" et al... they are marked M09DS, L09ES, G09FS, ... These boards have 8 SIMMs mounted horizontally on the left, 8 on the right and two DIP switches in the top center (along with various other TTL). According to the installation manual, the memory is arranged: --0-- DIP DIP --3-- --1-- --2-- --2-- --1-- --3-- --0-- --0-- --3-- --1-- --2-- --2-- --1-- --3-- --0-- where 0 is the first meg of memory, etc. There is no clue as to which of the 4 SIMM's in a megabyte has the high order bits in the word. --Mike Rubin