Ian,
Do you have a schematic that you can share with us?
Paul
I haven't heard of one of these, but I use a home-built board which is
simply a handful of LEDs hooked up to a ULN2003 driver chip which plugs
into
the parallel port and gives a clear indication of what is happening there.
For switch inputs, you can simply wire a 4k7 resistor from the pin to a 5v
supply line and then pull it low with a switch to ground. I would think
that
this is a better way than relying on a program running in the same
computer
as any faults in the computer are likely to get mimiced or ignored as when
EMC is running.
Ian
