Path: utzoo!utgpu!watmath!maytag!watstat!dmurdoch
From: dmurdoch@watstat.waterloo.edu (Duncan Murdoch)
Newsgroups: comp.sys.ibm.pc
Subject: Re: 640KB + 3072KB = 4 MB?
Message-ID: <494@maytag.waterloo.edu>
Date: 19 Sep 89 13:17:25 GMT
References: <8909170749.AA26779@euler.Berkeley.EDU> <240@bmers58.UUCP> <241@bmers58.UUCP>
Sender: daemon@maytag.waterloo.edu
Reply-To: dmurdoch@watstat.waterloo.edu (Duncan Murdoch)
Organization: U. of Waterloo, Ontario
Lines: 17

In article <241@bmers58.UUCP> mlord@bmers58.UUCP (Mark Lord) writes:
>
>Apparantly this memory actually does exist way up high in the extended memory
>map when not being used by the NEAT/BIOS, and 386MAX knows where to look for it.
...
>What might be needed for NEAT board users is a little program to fiddle the 
>NEAT registers to remap the rest of the RAM onto the end of the "normal"
>extended memory (plus fiddle the BIOS so it knows it is there).

According to my reading of the NEAT documentation, mapping can only be done
in 1 Meg chunks.  By "mapping", I mean changing the physical address.  Since
you have to have some memory physically addressed in the first megabyte,
with this chipset you have to have a whole megabyte there.  The only way
to avoid conflicts is to disable the parts needed for video, EMS, etc.
The disabling is done in 16K blocks.

Duncan Murdoch