Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!samsung!usc!ucsd!ames!amdcad!pepsi.amd.com!phil
From: phil@pepsi.amd.com
Newsgroups: comp.sys.ibm.pc
Subject: C&T NEAT chipset problems
Message-ID: <29251@amdcad.AMD.COM>
Date: 22 Feb 90 03:22:22 GMT
Sender: news@amdcad.AMD.COM
Reply-To: phil@pepsi.amd.com ()
Organization: Advanced Micro Devices, Inc. Sunnyvale CA
Lines: 20

I've already posted about deficiencies with regard to the NEAT
implementation of EMS 4.0 on a 286. (did I mention that in a 4 meg
system, the extended and expanded memory is allocated in chunks
of 1 megabyte?) 

I figured the best solution to that issue was to go for a 386 or
386sx. NEAT still isn't! As far as I can tell, the top 384K of the
first meg is only usable for shadow RAM. In the 286 world, I am
used to that 384K being remappable to extended memory. Not so with
a 386 NEAT.  If you didn't want shadow RAM for some reason, that
384K is totally unrelocatable and therefore wasted. Even if you did
want 64K or 128K of shadow RAM, you don't want it for your EMS
pageframe, so that 64K is wasted. Etc.

Are there other chip sets which are known to not be so wasteful
of RAM?

--
Phil Ngai, phil@amd.com		{uunet,decwrl,ucbvax}!amdcad!phil
When guns are outlawed, only governments will have guns.