Xref: utzoo comp.windows.ms:13379 comp.windows.ms.programmer:2842
Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!mips!apple!fernwood!uupsi!sunic!fuug!tuura!risto
From: risto@tuura.UUCP (Risto Lankinen)
Newsgroups: comp.windows.ms,comp.windows.ms.programmer
Subject: Re: Over 16 Meg
Message-ID: <1190@tuura.UUCP>
Date: 3 Jun 91 06:47:35 GMT
References: <1991May30.174414.19047@midway.uchicago.edu> <1991May30.000945.12529@xanadu.com> <1991May31.012439.4019@ux1.cso.uiuc.edu>
Organization: Nokia Data Systems Oy
Lines: 32

mcdonald@aries.scs.uiuc.edu (Doug McDonald) writes:

>In article <1991May30.174414.19047@midway.uchicago.edu> lair@ellis.uchicago.edu (Scott A. Laird) writes:
>>In article <1991May30.000945.12529@xanadu.com> ravi@xanadu.com (Ravi Pandya) writes:
>>>Has anyone had any success at all trying to get Windows 3.0 Enhanced
>>>Mode to recognize the existence of over 16 Mb of RAM? I have 32 Mb of
>>
>>Windows is still more or less a 286 app, with segments and 24-bit addressing,
>>and shouldn't be able to directly access 32 Mb of RAM.  Nothing designed to
>>run on a 286 can use more than 16 Mb of extended memory.

>I do not understand this. In 386 enhanced mode, Windows 3.0 uses virtual
>8086 mode for DOS programs. It should be able to run those above 16 megs.
>Does it?

Hi!

I don't have the hardware, so I can't check it out, but how is it with the
EISA or MCA buses?  Doesn't the AT-bus have 24 address pins only, so that
there's no 'standard' way to access the memory above 2^24, even if the CPU
were capable of addressing a greater amount of memory?  The way to go, in
addition to having CPU >= 386 , would be to increase the number of address
pins, which both EISA and MCA do.

As said, I'm only guessing...  can anyone confirm?

Terveisin: Risto Lankinen
-- 
Risto Lankinen / product specialist ***************************************
Nokia Data Systems, Technology Dept *  2                              3   *
THIS SPACE INTENTIONALLY LEFT BLANK * 2 +1 is PRIME!  Now working on 2 -1 *
replies: risto@yj.data.nokia.fi     ***************************************