Chasm: The Rift

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

Chasm: The Rift

Developers
	Action Forms
Publishers
	GT Interactive
	WizardWorks Software
	Megamedia Corp
Release dates
DOS	October 24, 1997

Key points

Also known as Chasm: The Shadow Zone.

Availability

Source	DRM	Notes	Keys	OS
Retail

A demo is available.

Essential improvements

Patches

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

Chasm Portable by David Szymanski

A compilation of several fixes and tweaks to make the game run better under DOSBox.

Includes bonus levels, level editor, original documentation, pre-release builds and other extras.

PanzerChasm

An open-source reconstruction of the original game engine for modern operating systems.

Supports high resolutions, widescreen, OpenGL rendering, texture filtering, networking and both true and original perspective modes.

Appears to no longer be in development, as the last version was released on December 3, 2017.

Game data

Configuration file(s) location

System	Location
DOS

Save game data location

System	Location
DOS

Video

Graphics feature	State	Notes
Widescreen resolution		Use PanzerChasm.
Multi-monitor
Ultra-widescreen
4K Ultra HD
Field of view (FOV)		Fixed at 85°.
Windowed		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
120+ FPS		Capped at 70 FPS.
High dynamic range display (HDR)

Input

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

Controller types

Audio

Audio feature	State	Notes
Separate volume controls		FX, CD
Surround sound
Subtitles
Closed captions
Mute on focus lost		For DOSBox change the priority background value in the DOSBox configuration file.

Localizations

Language	UI	Audio	Sub	Notes
English

Issues fixed

Technical Issues

This game must be run in DOSBox. Being a demanding 3D game in software mode only, even modern computers have trouble running the game at acceptable frame rates.

Mouse movement may stop working on occasion. Save and restart the game to fix.

Bad Performance

Performance Fix[citation needed]
Patch the game to the latest version (csmtcpip.exe). Download this fixed .exe file Replace the PS10.exe in the installation folder with the fixed version Notes Without this fix the game crashes if DOSBox is set to Dynamic CPU mode. This patch fixes that issue, allowing the game to run with smoother frame rates, even at higher resolutions. Inlcuded in Chasm Portable.

Music does not loop (DOSBox)

Music Fix
Download CTRLOOP.exe and place it in the installation folder Configure DOSBox to run CTRLOOP.exe before launching the game. Notes Included in Chasm Portable.

Other information

API

Technical specs	Supported	Notes
DOS video modes

System requirements

DOS
	Minimum	Recommended
Operating system (OS)	MS-DOS 4.0
Processor (CPU)	486 DX2-66 MHz	Pentium
System memory (RAM)	8 MB	16 MB under Win95
Hard disk drive (HDD)	12 MB
Video card (GPU)		PCI video recommended