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### 4.3 PC Users Running GNU/Linux

The default X server configuration varies from distribution to distribution and release to release of GNU/Linux. If your system fails to recognize the keypad keys as distinct keys, change the NumLock state, turning it on or off, as the case may be, then try again. If this doesn’t solve your problem, you may have to modify the X keysym mappings with `xmodmap`.

On one distribution on an Intel PC, the following `.xmodmaprc` set things up nicely.

    ! File:  .xmodmaprc
    !
    ! Set up PC keypad under GNU/Linux for the Emacs EDT Emulation
    !
    clear  mod2
    keycode  77 = F12
    keycode  96 = Num_Lock Pointer_EnableKeys
    add mod2 = Num_Lock

In this example, after feeding the file to the `xmodmap` command, the PC `NumLock` keypad key will be configurable for the emulation of the `PF1` key. The PC keypad can now emulate an LK-201 keypad (less the comma key), the standard keyboard supplied with DEC terminals VT-200 and above. This `.xmodmaprc` file switches the role of the `F12` and `NumLock` keys. It has been tested on RedHat GNU/Linux 5.2. Other versions of GNU/Linux may require different keycodes. (Unix for further help on how to do this.)

Please note: Remember, it may be necessary to have `NumLock` in one position (ON) or the other (OFF) for the PC keypad to emulate the LK-201 keypad properly.