jtsiomb / capsmap

DOS TSR for remapping caps lock

capsmap - DOS TSR for remapping caps lock

Author: John Tsiombikas [email protected]
This program is placed in the public domain. Do whatever you like with it.

Capsmap is a DOS Terminate and Stay Resident program, for remapping caps lock to any other key. It does this by taking control of the keyboard interrupt, and either modifying the BIOS keyboard flag bytes (for modifier keys), or appending scancodes to the BIOS keyboard buffer, when it detects a caps lock press/release. This remapping trick will work for most DOS programs which use either BIOS or DOS calls to get keyboard input. It will not work however for any programs which access the keyboard directly, like most games.

Two pre-built versions of the caps mapper are provided in the release archive.

• capsmap.com maps caps lock to the left control key.
• capsesc.com maps caps lock to the escape key.

If you wish to map caps lock to something else, you need to rebuild the program after changing a couple of definitions in the top of capsmap.asm, following the instructions in the comments. To figure out which scancode number to set in the code, use the accompanying testkeys.com program.