you can do it without special card for this, you can use
your parallel port to do it. I know there is some source
code to do this (using the parallel port to drive an lcd
display to show the cpu activity). Take a look on sunsite...
and it's done in userspace... that's why it's offtopic on
linux-kernel...
alex
-- \\-----------------------------------------------------------\\ // Alexandre Maret -- Linux : The choice of a GNU generation // \\ amaret@infomaniak.ch -- http://www.infomaniak.ch/~amaret \\ //-----------------------------------------------------------//