Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!apple!sun-barr!decwrl!ucbvax!hplabs!hp-sdd!craigb
From: craigb@hp-sdd.hp.com (Craig Bosworth)
Newsgroups: comp.sys.ibm.pc
Subject: Re: How to start an autobooting program without erasing memory?
Message-ID: <2226@hp-sdd.hp.com>
Date: 11 Jul 89 15:46:51 GMT
References: <899@rex.cs.tulane.edu> <2236@astroatc.UUCP> <1186@atanasoff.cs.iastate.edu> <2245@astroatc.UUCP>
Sender: news@hp-sdd.hp.com
Reply-To: craigb@hpsdl134.UUCP (Craig Bosworth)
Distribution: na
Organization: Hewlett-Packard, San Diego Division
Lines: 32

Hate to muddle things up here, but it is possible to install a TSR,
reboot, and still use the TSR.  IBM sold a 3270 emulation package
c. 1986 which does this.  The installation procedure is as follows:

  - Boot DOS
  - Run the install utility
  - The install utility loads the emulator, then reloads DOS.    
  - The reloaded DOS runs as an extension to the emulator, instead
    of the emulator running as an extension of DOS.

I don't know how they mapped everything to avoid hardcoded addresses in
DOS, but it worked.

I used this program very briefly, but soon switched to an internal 
package that did the emulation with a more traditional TSR.

So it is possible to install some kind of background program then reload
the system.

So there.

BOS

Craig Bosworth  (619) 592-8609           16399 West Bernardo Drive
Hewlett-Packard, San Diego Division      San Diego, CA  92127-1899
UUCP     : {hplabs|nosc|hpfcla|ucsd}!hp-sdd!craigb
Internet : craigb%hp-sdd@hp-sde.sde.hp.com (or @nosc.mil, @ucsd.edu)
-- 
Craig Bosworth  (619) 592-8609           16399 West Bernardo Drive
Hewlett-Packard, San Diego Division      San Diego, CA  92127-1899
UUCP     : {hplabs|nosc|hpfcla|ucsd}!hp-sdd!craigb
Internet : craigb%hp-sdd@hp-sde.sde.hp.com (or @nosc.mil, @ucsd.edu)