jerry@hanler.com said: > I tried scoping some pins. I see a few different levels and one pin has > what looks like a clock signal with a period of about 4.2ms. Other than > that, hard to tell without a manual. Some devices print out version info and such at power up. If you are willing to power cycle one, you might learn something by putting a scope on a pin when you power cycle it. You can probably tell input pins from output pins by connecting a pin to ground or power through a 10 K resistor. (That's assuming that one of the output pins is high so you can tell what power is. Or just guess 5V since it's old enough. Or poke around to see what you find.) -- These are my opinions. I hate spam.