> That reminds me of a circuit I saw many years ago. The circuit computed > logs using a Z80. It put the Z80 in the feedback of an op amp, using it a= s > a diode. Ouch. That's harsh=20 --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .