Path: utzoo!bnr-vpa!bnr-fos!bigsur!bnr-rsc!bcarh61!schow
From: schow@bcarh61.bnr.ca (Stanley T.H. Chow)
Newsgroups: comp.sys.ibm.pc
Subject: NEAT chips fiddling (was Re: Why is DOS limited to 640K? / extra RAM
Message-ID: <1359@bnr-rsc.UUCP>
Date: 13 Nov 89 06:23:37 GMT
References: <371@ucsvc.ucs.unimelb.edu.au>
Sender: news@bnr-rsc.UUCP
Reply-To: schow%BNR.CA.bitnet@relay.cs.net (Stanley T.H. Chow)
Organization: BNR Ottawa, Canada
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In article <371@ucsvc.ucs.unimelb.edu.au> U5533129@ucsvc.ucs.unimelb.edu.au (CARDIOLOGY, R.M.H.) writes:
>There was a rumour some months back that a program could be written which
>fiddled the NEAT chip set registers to enable the block of RAM between 640k
>and 704k (for those without EGA).  Does anyone know if this has been done, or
>alternatively how it could be done?
>
>Peter S.

Yes, it is possible to fiddle the NEAT chip set to make it hand the
memory back. DOS would still have to be told to use it. If you can't find
the program (or if no one has written it), I can whip it up real quick.
This is useful only if you have on a 286 or a 386 *not* running QEMM.


Now a question of my own: 

      Is QEMM truly brain-damaged or have I just not found the right
      magic spell?

      Specifically, I am trying to recover the "hidden" 384K of RAM (you
      know, the stuff above 640K that NEAT dedicates to ROM shadowing).

One my system: NEAT chipset with AMI bios, the ROM bios turns off all 
the hidden 384K (except for shadowing), so QEMM thinks there is no 
memory there. Oh, that's easy, I said. So I play around with the NEAT
registers and turned the memory back on. Now QEMM recognizes the memory.
*However*, QEMM now also marks the LOGICAL address range as "Unavailable"!
It seems I can have either the physical memory or the logical address 
space. I want *both*.

A friend (hi Mark) tells me this has been discussed before in the group
and the conclusion was that QEMM is not up to the job. Please tell me this
ain't so. [I did not follow the earlier discussion since I only got my 
386 a couple of months ago :-)].

Stanley Chow        BitNet:  schow@BNR.CA
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(613) 763-2831		     ..!utgpu!bnr-vpa!bnr-rsc!schow%bcarh61
Me? Represent other people? Don't make them laugh so hard.