Steve M. Taylor wrote:
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So your crystal is running, you reset is cleared, your EA pin is high ?

Unfortunately I wasn't able to procure an oscilloscope tonight.. but I checked the EA pin (pin 31 on the Philips P89C51RC2).. and it seems odd..

When I hold my multimeter to it, it starts low (~1mV).. and starts climbing.. I think I've seen it up around ~80mV.. still really low.. it resets if I remove the probes, and put them back on...

It stays in this state in both Run and Program mode... Should EA be forced high in Run mode, and low during programming mode? Or is EA strictly output?

-Ryan