Doom
Doom, written by the ever popular iD software, was released in 1994 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.
Versions
Doom spawned several versions including:
Doom 1
This was the original doom.
Doom 2
Engine
The engine from Doom was then licensed to various people and was sold with the following games:
Hertic
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.
