Filser interfacing woes

Hello all,
My old portable PC packed up definitely a few weeks ago and
when I started looking around for a new one I found that
none of them have the old traditional serial port anymore !?

This rather leaves me in the lurch with the Filser GPS-logger
in my glider, since the interface is over a cable that connects
to the serial port.

I imagine there may be others here who have come up agaist
the same thing. Can anyone point me to a solution ?

The model is Filser DX-50, functionally equivalent to the Lx5000
I am told, and possibly this particular problem will be the
same for some other models as well.

Cheers CV