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From: pre1@sphinx.uchicago.edu (Grant Prellwitz)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Can I use 768K on motherboard?
Message-ID: <2073@sphinx.uchicago.edu>
Date: Thu, 16-Jul-87 00:56:41 EDT
Article-I.D.: sphinx.2073
Posted: Thu Jul 16 00:56:41 1987
Date-Received: Sat, 18-Jul-87 04:15:32 EDT
References: <2413@usceast.UUCP>
Reply-To: pre1@sphinx.UUCP (Grant Prellwitz)
Distribution: na
Organization: U Chicago Computation Center
Lines: 39

In article <2413@usceast.UUCP> wilhite@usceast.UUCP.UUCP (Robert Wilhite) writes:
>I have a Leading Edge "D" with extra memory in it.  (I bought it with
>512K, and added one bank of 256Kb chips to the motherboard.  So it has
>768K of memory.)
>
>Is there any way to make use of the extra memory?  DOS, of course,
>reports only 640K, but I figger a customized RAMdisk could use the
>extra stuff.
>
>Has anyone else done this?
>-- 
>---------------------
>Robert Wilhite
>{ncrcae,akgua}!usceast!wilhite

I don't know if the Leading Edge can do it, but all of the Kaypro PC's are
shipped with 768KB and RAMdisk software to access the top 128KB.  I have also
done the same thing with my Zenith by using a new PAL chip that I bought
from KEA Systems (order info on request) for around $50.  I now very happily
set up a 128KB RAMdisk on my Zenith using the Kaypro software and still have
640KB for other things.

In regards to incompatibilities, We can use this memory on a Kaypro with
everything from a standard mono card to an ATI EGA Wonder with no problems.
I did run into my first problem with it tonight, however, when I was installing
a 2MB Zucker LIM expanded memory board in the Kaypro.  It would fail with a
message about not being able to get at the RAM from C000:0000 to E000:FFFF.
Switching one of the DIPs on the Kaypro multiprocessor to tell it that there
was only 640KB solved that problem (so I guess that we only got 1920KB instead
of 2048KB).

This doesn't relate to the LED, but maybe it can give you some hope: it is
possible on at least some machines.  

-- 
=====================Grant Prellwitz==========================
!ihnp4!gargoyle!sphinx!pre1          pre1@sphinx.UChicago.UUCP 
76474,2121 (CIS)                                    pre1 (BIX)  
The DOCTOR didn't need a funny line, why do I?