
               Notes on Doom V1.2 compared to Doom v1.1.
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

                         Last Change: 23/3/94


First off, please tell me if these instructions contain any
innacuracies!

Anyway...

Some things about v1.2 compared to v1.1 (NOT new feature descriptions,
just general information):

1. Saved games from v1.1 are NOT compatible with 1.2. This ALSO applies
   to .lmp demo's made under v1.1. In both cases, this applies to the
   Shareware version AND the Registered version. ALSO: ig you are
   reading this BEFORE using a 1.2 patch file, be warned that all the
   old saved game positions will be destroyed, so take backups if you
   want to keep them!


2. The cheats still work, but not in Nightmare mode (only idclev and
   iddt still work in Nightmare mode. Some have said even these do not
   always work, either, although I found them to be ok.),

3. I have been informed that Doom v1.2 will NOT run under OS/2 if you are
   trying to use a soundcard. If this problem occurs for you, turn off the
   sound using the setup program.

4. v1.2 has some nasty bugs cencerning the control of your character.
   If you have a PS/2 mouse setup, this is almost certain to occur, but
   it is far more widespread than this. Symptoms: your character goes
   crazy, shooting all over the place, moving erratically, the etc..
   Id is working on this problem just now. As someone who emailed me
   about the bug said:

   "It's not limited to the PS/2 mouse or even to the mouse in
   particular. There's some bug with the input device. The bug can
   happen with *any* mouse, or even if you are playing only with the
   keyboard."

   However, PS/2 mice are most prone to the problem.

   Running Doom from windows is apparently one way to solve the
   problem. I now have a help file available for anyone who wishes to
   know how to run Doom under windows. If you would like a copy, please
   email me.

   One definite way to fix the problem (if it's the mouse that's acting
   crazy) is to use an adaptor to plug the mouse into the serial port,
   or just use a serial mouse. This method was successful for me, and
   has been for many others as well.

   Some people have found that using a different mouse driver solved
   the problem, or at least greatly lessened it. One mouse driver
   particularly mentioned a lot is the GMOUSE mouse driver. This driver
   can be obtained via ftp from:

      oak.oakland.edu

   in the directory:

      /pub/msdos/mouse

   and the file is called:

      gmous102.zip

   Don't forget to enter 'bin' before you enter 'get'!!

   For those without ftp, I can email you the driver.

   Someone said to me that this driver works best when configured for
   two button mode, in that the bug is still present when set for three
   button mode. Thus, if you're used to using a 3 button mouse, try (a)
   using just the left and right buttons, (b) setting the driver for a
   two button mouse, and (c) maybe use ALT for strafing instead of the
   middle button (or whatever it was that you used the middle button
   for).

   As to why the PS/2 mouse setup is particularly problem prone, I
   spoke to someone who knows a lot about pc's, and was invloved with
   their design years ago. He said:

      "Also, PS/2 mice are a marginal idea at best--they suffer from
       many of the same problems as do PC joysticks--the interface
       was built with a 6MHz cpu in mind -- not 33/66MHz PCs!
       There are several areas were improper matching of impedance,
       etc. can cause various forms of aliasing effects to occur."


   An apology if you are having keyboard control problems:

   Unfortunately, if you are someone who is experience character-
   control problems using the keboard, then I am sorry to say that I do
   not have any information on how to lessen such problems at this
   time.

   Hopefully, however, the rest of the above information will be of
   some use.


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This help brought to you by:

Ian Mapleson,
Department of Computer Science and Electrical Engineering,
Heriot Watt University,
Riccarton Campus,
Edinburgh,
Scotland,
United Kingdom.

email address: mapleson@cee.hw.ac.uk

Doom on! :)

