I don't really know anything about international keyboards, but I saw this on the rufus website, maybe this will give you a clue:

Notes on DOS support:

If you create a DOS bootable drive and use a non-US keyboard, Rufus will attempt to select a keyboard layout according to the locale of your system. In that case, FreeDOS, which is the default selection, is recommended over MS-DOS, as it supports more keyboard layouts.



On Wed, Dec 17, 2014 at 1:11 AM, Multifrac@t-online.de <Multifrac@t-online.de> wrote:
Second request:
The usbstick generated with Rufus boots ok,
but the Western European Keyboard layout does not
include the TILDE (~) and Backslash (\) keys,
which can be called using the ascii code, 126 and 92
but you must have a numpad to do so.
Is there a way to get a complete keyboard layout
or to add these keys?
Thanks for any information
Petta

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