Ken wrote:

OK, I misunderstood. I thought you had a monitor that exhibited both
problems. From what I read you can perform just about everything with
the software and cable, so you are probably correct in expecting the
convergence problem to be corrected as well. Should you get a cable
and try the software, post a new message in the news group telling us
how it worked. I would be interested in your results. Good luck.

Perfect, Ken.
I have buyed the cable/adaptator and d/loaded the program.
I think that the cable need about 10 days to arrive ( sigh..), but BE SURE
that I post a new message with the results, in the 21" and also in the 19"
one.
You have traced me the correct way to find the problem: thank you a lot!