Doom
Doom, written by the ever popular iD software, was released December 10th, 1993 and was one of the most influential video games of its time. It pushed PC hardware to the limits, and forced many to upgrade to the latest 486 CPU, and VL video cards.
Doom was written in C, and compiled with the Watcom C compiler. It was built as a DPMI executable not only demanding protected mode, but also a 32bit cpu. Many see the rise of Doom, which led to the subsiquent rise of Windows 95 as any machine that could run Doom acceptable, could run Windows 95.
Being written in C allowed for the game to be ported to various operating systems. Doom was originally written on the NeXTSTEP Operating system, and itself ported to MS-DOS with the Watcom compiler.
Contents
Versions
Doom spawned several versions including:
Doom 1
This was the original doom. There has been several beta versions released which can be found here: http://www.rome.ro/lee_killough/versions/
IWAD sizes
The easiest way to determine which version of Doom you have is to consult the following table
10396254 doom-registered-1.1/doom.wad 10399316 doom-registered-1.2/doom.wad 11159840 doom-registered-1.666/doom.wad 11159840 doom-registered-1.9/doom.wad 4207819 doom-shareware-1.0/doom1.wad 4274218 doom-shareware-1.1/doom1.wad 4225504 doom-shareware-1.2/doom1.wad 4261144 doom-shareware-1.4/doom1.wad 4271324 doom-shareware-1.5/doom1.wad 4234124 doom-shareware-1.666/doom1.wad 4211660 doom-shareware-1.6/doom1.wad 4196020 doom-shareware-1.8/doom1.wad 4196020 doom-shareware-1.9/doom1.wad
Other languages: I've found a Japanese version of Doom for the PC98, the IWAD is 1.2
Doom 2
Doom II, hell on earth was released on October 10th, 1994
version:
14943400 doom2-1.666/doom2.wad 14612688 doom2-1.7a/doom2.wad 14604584 doom2-1.9/doom2.wad
Engine
The engine from Doom was then licensed to various people and was sold with the following games:
Hertic
Hexen
Going free
The source code to the Doom engine was then released under the GPL. You can download it from iD's main site. Or better google for doomsrc.zip.
After building Doom for the UnixWare OS, I've found that you must define NORMALINUX, otherwise the resulting exe seems not to run correctly.
