Some usb-serial dongles have an integrated voltage converter and
output +/- 12 V on the lines. They also implement all the control
lines available on the nine pin connector. These work.
Some dongles dispense with this complexity and just provide 0-5 V.
The "Prolific" brand is said to work.
As for opening up the computer and fitting the header ... Opening up
works, it is the "putting it back together in working order" that is
the problem.
If you have a laptop/netbook with at least one free usb port and a
dongle this could be used for general use with your micro based boards
- just provide a serial in/out port in your project and you have a
full keyboard and display which costs nothing extra.
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