Have you used your calculator for something that was not really math related?

[TomC]

X10 home power control:

I had connected a HP48G to a serial <->X10 converter. I then wrote code to 'talk to' the various X10 devices in my home. This was a most flexible controller that could turn lights on, dim up, dim down dependent on the day of week, time of year, etc...

TomC