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From: phil@pepsi.amd.com (Phil Ngai)
Newsgroups: comp.sys.ibm.pc
Subject: Re: 640K limit
Message-ID: <28827@amdcad.AMD.COM>
Date: 17 Jan 90 05:16:09 GMT
References: <4668.25aed7f2@uwovax.uwo.ca> <1468@blackbird.afit.af.mil> <28808@amdcad.AMD.COM> <729@jethro.Corp.Sun.COM> <4308@brazos.Rice.edu>
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Reply-To: phil@pepsi.AMD.COM (Phil Ngai)
Organization: Advanced Micro Devices, Inc. Sunnyvale CA
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In article <4308@brazos.Rice.edu> solomon@screech.rice.edu (Richard L. Solomon) writes:
|	NO....they SHOULD have mapped the I/O in the I/O ADDRESS SPACE where
|it belongs......there are 64kB of I/O addresses, anyone use that much?
|(Excluding VidRAM and EMS which obviously could legitimately be in the
|memory address space.)  

By "IO" Video RAM was exactly what I meant. The IO that you are thinking
about, such as serial ports, are ALREADY in the IO space.

|	I beg to differ!  CP/M requires that its "kernal" (and we use that
|term lightly :) ) reside at the top of the address space.  The actual

No doubt, since you can't spell it.

Anyway, I will say it again: protected mode is the way to go. This will
be available in Windows 3.0 or OS|2. Since these platforms provide GUIs
which mimic Apple's, they will be very popular and DOS along with its
640K limit will become less and less important.

--
Phil Ngai, phil@diablo.amd.com		{uunet,decwrl,ucbvax}!amdcad!phil
Peace through strength.