Jitter Testing Dongle

[Till Franitza]

Hi!
It is a common problem to test the interrupt response Time of a system.
One of my students has designed a piece of Hardware that i consider quite
useful in this: A dongle that is attached to the Parallel Port and sends
perodic interrupts to the Parallel port. With every interrupt it sends, it
sets a flipflop high that the computer must set low via parallel port. This
high-signal can be seen on a BNC connector. The Dongle contains a
microcontroller from atmel that can be told to send interrupts at different
rates (frequencies). The handy thing is that there are a minimum of
disturbances due to loose long cables. Anyone interested in this hardware?
Till
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