I found some diagrams of the RS232 hookup at

http://www.swproducts.biz/ChronoCap/connections.htm
(near the bottom of the page).

But I've not seen any 'free-ware' around for reading in the data.
I'm thinking maybe Matlab or LabView (or even Visual Basic) could be
used to capture the data. Then one could use Excel to work it over some.

Maybe I'll hook up the O-scope to that un-used lead and see if there
is any signals on it. (After I press the button or fire a pellet).

Cheers,
Rich