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From: theall@rm105serve.sas.upenn.edu (George A. Theall)
Newsgroups: comp.sys.dec.micro
Subject: Re: Rainbow EchoMail Digest
Summary: Two ways to expand memory with 100A
Keywords: memory, Rainbow
Message-ID: <37304@netnews.upenn.edu>
Date: 11 Feb 91 13:23:09 GMT
References: <1991Feb10.064845.11346@wpi.WPI.EDU> <37256@netnews.upenn.edu> <1991Feb11.010441.2469@Solbourne.COM>
Sender: news@netnews.upenn.edu
Organization: University of Pennsylvania
Lines: 32

In article <1991Feb11.010441.2469@Solbourne.COM> imp@Solbourne.COM
 (Warner Losh) writes:
>In article <37256@netnews.upenn.edu> theall@rm105serve.sas.upenn.edu
>(George A. Theall) writes: 
>>   There's are 64K and 192K "memory options" for the 100A. Along
>>with the motherboard memory, they bring the total system memory 
>>to either 128K or 256K *MAX*.
>
>Didn't DEC or some third part (Suitable Solutions?) produce an adapter
>board that would allow you to plug in the 768K expansion card in a
>100A.  It also was required for the 8087 co-processor in a 100A.  Does
>anybody else remember this, or am I misremembering things....

   You are remembering things correctly, Warner. There are two ways to
expand memory on a 100A -- the first is with a "memory option" which
limits you as noted above; the second is with a "memory adaptor option"
along with a "memory module". The methods are incompatible with each
other. [There may have been other methods too; eg,  using an 8087
board, a board from SS... but I'm not familiar with them.]

   The post I had responded to wanted to expand memory cheaply on his
100A. He appears to say 256K would be enough. In that case I suspect
the first approach will be the cheapest as many folks in the past have
upgraded their 100As to 832K from 256K and  thus have basically useless
"memory options".


George
--- 
theall@rm105serve.sas.upenn.edu			Dept. of Economics
theall@ssctemp.sas.upenn.edu			Univ. of Pennsylvania
gtheall@penndrls.upenn.edu			Philadelphia, PA 19104