Graynomad:
OK, so apart from Charlieplexing, bi-colour LEDs, latching relays, light bulbs, small peltier junctions, a low-power H-bridge, 1-wire serial comms and loopback testing I can't think of any way that is useful offhand.
Rob
I agree, except for the loopback testing thingee? Wouldn't any kind of logical 'loop back test' require a output pin wired to a input pin so continuity could be tested? Two outputs don't make any kind of loop back test in my book?
Lefty