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From: GTHEALL@PENNDRLS.UPENN.EDU (George A. Theall)
Newsgroups: comp.sys.dec.micro
Subject: Rainbow EchoMail Digest
Message-ID: <9010291316.AA01945@remote.dccs.upenn.edu>
Date: 29 Oct 90 13:16:00 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
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Lines: 65

Rainbow EchoMail Digest                         Oct 29, 1990

In this issue:
  RE: MEMORY CHIPS
  RE: EXTENDED MEMORY ON A


  Articles posted to either INFO-DEC-MICRO or comp.sys.dec.micro are
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------------------------------------------------------------------------
Date:     10-26-90 (08:00)
To:       ALL
Subject:  RE: MEMORY CHIPS
From:     FRANK ZSITVAY

In article <322.272585D7.@techbks1.FIDONET.ORG>
George.Theall@f203.n273.z1.FIDONET.ORG (George Theall) writes:
>PF>Where can I obtain memory chips for my 100B?  My memory board only has
>PF>128k on it... want to expand my system to 7**.
>
>   First find out if the chips you already have are 64k-bit chips - if so
>you'll probably be better off pulling those chips and starting with an empty
>board. You'll need either 2 or 3 banks of 256k-bit chips: 3 is the maximum.
>Each bank consists (I believe) of 8 chips, but you'd be wise to buy in sets of
                                   ^
   actually needs 9 chips to a bank.  i found out the hard way.

   by the by, could someone sell me 3 41256 150ns chips??

- --
fzsitvay@techbook.COM - but don't quote me on that....
American Oil Company motto - Bend over, We'll pump!!!


- --- QM v1.00
 * Origin: TECHbooks One, Fido Gate to techbook (503) 644-8135 (1:105/369.0)
------------------------------
Date:     10-28-90 (12:40)
To:       DAVID MAROUN
Subject:  RE: EXTENDED MEMORY ON A
From:     CARL HOUSEMAN

re: will utilities that allow use of extended memory on other machines
     work on Rainbows?

 This is very unlikely.  When you speak of "shadow" memory you're
talking about RAM which is addressed at the same locations as
ROM or other slower memory between 640K and 1024K (PC clones).
It is NOT the same as extended memory, which is addressed
STARTING at 1024K and goes up from there.  In order for the
Rainbow to use, for example, the Microsoft HIMEM.SYS driver,
any unused Rainbow RAM would have to be relocated from
addresses below 1024K to addresses starting at 1024K. Some PC
clones with the Chips & Technologies chip set can do this, but
without that kind of memory management hardware on the Turbow
board, there's no possibility.


- --- Opus-CBCS 1.12
 * Origin: Silver Bullet - Silver Spring, Md - 301-622-2247 (1:109/417.0)
------------------------------