Path: utzoo!attcan!uunet!mcsun!ukc!axion!axion.bt.co.uk!iwarner
From: iwarner@axion.bt.co.uk (Ivan Warner)
Newsgroups: comp.sys.ibm.pc.programmer
Subject: Some MS-DOS configuration questions
Message-ID: <1990Mar20.171709.16368@axion.bt.co.uk>
Date: 20 Mar 90 17:17:09 GMT
Sender: news@axion.bt.co.uk
Reply-To: iwarner@axion.bt.co.uk (Ivan Warner)
Organization: British Telecom Research Labs
Lines: 27


	My knowledge of MS-DOS is sparse, so I would like some of the gaps
filled in by your good selves. I am seeking information on the
configuration of MS-DOS, and its limitations.

1) MS-DOS has a limit of 640K memory, but can access extended memory in
a non standard(??) way.

	Q1. Why the 640K limit, when the 8086 can address 1Mb, I believe.
	Q2. Do memory resident programs have to reside in this address space,
or can they be in extended mem?
	Q3. Can an application be run ENTIRELY from extended memory?
	Q4. How is access achieved to the extended memory?

2) How is the location of TSR progs decided - how do several co-exist in
harmony? (in my experience, not very well :-( )

3) I/O addresses of add-on hardware boards: Is there an area of the
memory map set aside for these, and if so where?


	Thanks in advance

	Ivan Warner
	BT Research Labs
	Ipswich
	UK