Chasm: The Rift

From PCGamingWiki, the wiki about fixing PC games
This page may require cleanup to meet basic quality standards. You can help by modifying the article. The discussion page may contain useful suggestions.

This page is for the 1997 first-person shooter. For the unrelated 2018 adventure-platformer, see Chasm.

Chasm: The Rift
Chasm: The Rift cover
Action Forms
GT Interactive
WizardWorks Software
Megamedia Corp
Release dates
DOS September 30, 1997
Chasm: The Rift on HowLongToBeat
Chasm: The Rift on IGDB
Chasm: The Rift on MobyGames
Chasm: The Rift on Wikipedia

Key points

Originally titled Chasm: The Shadow Zone during development.[1]


Source DRM Notes Keys OS
DRM details are not known
A demo is available.

Essential improvements[edit]


Patch csmtcpip.exe is the latest version. Place file in the installation folder and run via DOSBox. This patch includes the bonus levels.

Game data[edit]

Configuration file(s) location[edit]

System Location

Save game data location[edit]

System Location


Graphics feature State Notes
Widescreen resolution
4K Ultra HD
Field of view (FOV)
For DOSBox toggle with Alt+ Enter (see the glossary page for other workarounds).
Borderless fullscreen windowed
See the glossary page for potential workarounds.
Anisotropic filtering (AF)
Anti-aliasing (AA)
Vertical sync (Vsync)
For DOSBox use an unofficial build (see the glossary page for other workarounds).
60 FPS
70 fps cap
120+ FPS
High dynamic range display (HDR)


Keyboard and mouse State Notes
Mouse acceleration
Mouse sensitivity
Mouse input in menus
Mouse Y-axis inversion
Controller support
For DOSBox use the DOSBox Mapper (see the glossary page for other workarounds).


Audio feature State Notes
Separate volume controls
Surround sound
Closed captions
Mute on focus lost

Issues fixed[edit]

Technical Issues[edit]

This game must be run in DOSBox as it is a DOS game. As it is a demanding 3D game within DOSBox, it requires modern processors to run at acceptable frame rates.
Mouse movement may stop working on occasion. Save and restart the game to fix.

Performance Fix[edit]

Performance Fix[citation needed]
  1. Patch the game to the latest version (csmtcpip.exe).
  2. Download this fixed .exe file
  3. Replace the PS10.exe in the installation folder with the fixed version


Without this fix the game would crash if DOSBox was set to 'dynamic CPU' mode, and without that mode the game would run at an unacceptable FPS regardless of how powerful the processor was. This patch fixed that, allowing the game to be run at 640x480 resolutions at smoother framerates.

Music does not loop (DOSBox)[edit]

Without this fix the music does not loop in DOSBox, playing only once.
Music Fix[2]
  1. Download CTRLOOP.exe and place it in the installation folder
  2. Configure DOSBox to run CTRLOOP.exe before launching the game.

Other information[edit]


Technical specs Supported Notes
DOS video modes

Engine reconstruction for Windows[edit]

PanzerChasm is WIP reconstruction of original engine from scratch. Supports high resolutions, widescreen, OpenGL, texture filtering, networking, both true and 2.5 perspective modes. Currently in semi-playable state. Requires original files.

System requirements[edit]

Operating system (OS)
Processor (CPU)
System memory (RAM)
Hard disk drive (HDD)