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From: mcdonald@aries.scs.uiuc.edu (Doug McDonald)
Newsgroups: comp.windows.ms
Subject: himem.sys woes - fix???
Message-ID: <1990Jul31.010650.2060@ux1.cso.uiuc.edu>
Date: 31 Jul 90 01:06:50 GMT
Sender: usenet@ux1.cso.uiuc.edu (News)
Reply-To: mcdonald@aries.scs.uiuc.edu (Doug McDonald)
Organization: School of Chemical Sciences, Univ. of Illinois at Urbana-Champaign
Lines: 48

I have posted several articles flaming the Win 3.0 himem.sys program.
It refuses to let me run my 32-bit 386 programs that use the Phar Lap
extender. I have a kludge around the problem which I am going to be
rash enough to post. Please folks: this is for running programs with said
Phar Lap extender. (There are commercial programs that use it.)
It has not been tested for anything else. Caveat emptor. I have tested it
extensively for two days for my work, including writing a program that
zeroed all the extended memory it could malloc up.

Here is how it works (on you 386 or 486): You can't use the Smartdrive that
comes with Win 3.0. I am using the last Win 386 one. You put it and
himem.sys from Win 3.0 in your config.sys. And no other .sys files that
use exTended memory. About exPanded memory drivers I have no idea at all.
Then AFTER you run and exit Windows, you run the following program
(compiled with Microsoft C 5.1):

#include <dos.h>
#include <stdio.h>
union REGS rg;
main()
{
  unsigned long i;
  unsigned long far * ptr;  

  ptr = *(unsigned long far * far *)(0x54l);
 

  i = *ptr;
  if(i != 0x7588fc80l) exit(1);
  i = ptr[1];
  if(i != 0xcfc03303) exit(1);

  *ptr &= 0xff00ffffl;

}

You only have to do this once. After using Windows again it is not
necessary.

This redirects the bios interrupt for extended memory to where it
was before himem.sys so ungraciously stole it. IF himem.sys permanently
uses memory at the top of your extended memory (below Smartdrive)
and you use that again by this method, something awful, hopefully just
a crash, will occur.

Again, caveat emptor.

Doug McDonald