I've heard that this program will mate a chrony to pc via dos.
It's at
http://stevespages.com/page8b.htm
I've d/l'd it but haven't tried it yet. There's lots of other
ballistics programs on this page too.
By the way, Qball was written by Ben Hartley of New Hampshire and I
heard that the last version was 3.3 He's aparently abandoned the
program and doesn't plan to update it again.