Sorry, the (50Hz ...) note doesn't belong there. I copy/pasted it somewhere else in the message while I should have CUT/pasted it ... grmblll... ----- Original Message ----- ... > time required = 1,000,000 processor cycles (50 Hz refresh rate with a 20MHz > processor) ... -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu