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From: khoo@husc8.HARVARD.EDU (Oonchye Khoo)
Newsgroups: comp.sys.ibm.pc
Subject: Re: 386 Memory question (simms)
Message-ID: <3090@husc6.harvard.edu>
Date: 30 May 90 23:41:23 GMT
References: <5923@buengc.BU.EDU> <4922@plains.UUCP> <3873@jato.Jpl.Nasa.Gov> <7374@fy.sei.cmu.edu>
Sender: news@husc6.harvard.edu
Reply-To: khoo@husc8.UUCP (Oonchye Khoo)
Organization: Harvard University Science Center   Cambridge, MA
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>>required to do this.  That is why you can put 2MB at a time into SX machines,
>>but must put 4MB into a DX.  Or 512KB or 1MB if you're using 256K SIMMs.

If you are using 1 mbit chips, then you must add 4, 2 or 1 SIMM respectively,  
for: i) 4mb at a time for 32 bit paths (386DX), 
    ii) 2mb at a time for 16 bit paths (386SX or 286) and 
   iii) 1 mb at a time for 8 bit paths (8088, XT class machines)
Divide memory (but not # of SIMMS) by four if you are using 256kbit chips.

Unless, your computer uses memory interleaving.  Multiply by two for
2 way interleaved memory (usual interleave, found on the PS/2 70's and 80's),
multiply by four for 4 way interleaved (very rare).

On the PS/2's they sometimes use SIMMS with 36 256kbit chips on them.  In
which case you only need 1 SIMM for a 2 way inteleaved 386SX or 286 machine.

Regards,  

---
 Ah Love! Could You and I with Fate conspire, To Grasp this sorry scheme
 *of things             (Lawrence Oon-Chye Khoo)               Entire, * 
 Would we not            khoo@husc8.harvard.edu               Shatter it
 *and then,        35 Oxford St, Cambridge, MA 02138           Shape it*  
 closer to our heart's Desire.   ---   From The Rubaiyat of Omar Khayam.