Doom port for DOS, based on PCDoom by @nukeykt. The goal of this port is to make it as fast as possible for 386/486 personal computers.

• Added FPS ingame viewer
• Added FPS calculation after timedemo runs
• Added option to render visplanes (ceiling and floors) without textures
• Added option to render walls without textures
• Added option to render Spectres and invisible objects like real transparent objects (harder to see, a little faster to render)
• Added option to render sky as a flat fixed color
• Added option to render Spectre and invisible objects like the Sega Saturn port did
• Added option to render Spectre and invisible objects like Heretic/Hexen
• New option to show only objects that are not far away from the player. All the enemies are still rendered as they're important
• PC Speaker uses all sounds available (just for fun!)
• New mode for PC Speaker (digitized sound!)
• Disney Sound Source support
• COVOX LPT DAC support
• Adlib OPL2 PCM support
• OPL2LPT and OPL3LPT support
• Tandy 3-voice PCM support (SN76489)
• Creative Music System / Game Blaster support
• Audio-CD music support
• PCM music support (through sound fx device)
• Hercules automap support
• Lot's of optimizations to make the game run faster / smoother
• Removed low memory limit (may cause crashes with low RAM)
• New detail level: Potato. It renders the full scene with a quarter width resolution (max 80x200). Much faster rendering, specially on 386 cpu's and slow 8-bit VGA ISA cards.
• Better use of system RAM (full memory allocation)
• Removed network gaming support
• Removed joystick support
• Removed Y mouse movement (move forward/backwards)
• Added autorun support (F12 key)
• Added mono sound support
• Replaced DOS/4GW with DOS/32A providing a good speedup!
• New setup program
• New video modes (Mode 13h, MDA, CGA, EGA, Hercules, Text modes, VESA 2.0, Plantronics Colorplus, Sigma Color 400, Hercules InColor)
• Advanced benchmark support
• Uncapped FPS mode support (frame interpolation, more than 35 fps)
• HiRes VESA video modes support

FastDoom 0.8 Live Demo (Texas Instruments 486DLC @40 MHz, Cirrus Logic GD-5422 ISA):

Full video here

Requirements: Linux or WSL2 on Windows.

1. Install OpenWatcom v2, NASM, GNU Make and DOSBox-X
2. Execute source fdenv.sh
3. Build:
   • Single executable: build.sh <executable> <parameters> Where: "executable" is the executable name (fdoom.exe, fdoomega.exe, ...) and "parameters" can be one of these:
     • "-clean": cleans all generated OBJs,
     • "-stub": adds the DOS/32 stub,
     • "-debug": generates debugging exectable, needs dbgcfg.h file to be adjusted to your needs
   • All the executables + automatic DOS/32 stubs: buildall.sh
   • Generate a full release package (ZIP): package.sh

Example to build a fresh FastDoom executable ready to use on real hardware:

./source fdenv.sh
./build.sh fdoom.exe -clean -stub

Requirements: Windows 3.1 or Windows 9x

1. Install Borland C++ 4.52
2. Install Laughing Dog Screen Maker 1.14
3. Run .\FDSETUP\SCREENS\MAKE.BAT (MS-DOS)
4. Open setup.ide project in Borland C++ IDE
5. Build the project

This project exists thanks to all the people who contribute.

Feel free to add issues or pull requests here on GitHub. I cannot guarantee that I will accept your changes, but feel free to fork the repo and make changes as you see fit. Thanks!