http://www.galaxoft.org/linxr/source/Documentation/devices.txt#904
42 char Demo/sample use
42 block Demo/sample use
This number is intended for use in sample code, as
well as a general "example" device number. It
should never be used for a device driver that is being
distributed; either obtain an official number or use
the local/experimental range. The sudden addition or
removal of a driver with this number should not cause
ill effects to the system (bugs excepted.)
IN PARTICULAR, ANY DISTRIBUTION WHICH CONTAINS A
DEVICE DRIVER USING MAJOR NUMBER 42 IS NONCOMPLIANT.
