Yup, I'm reading from the Softy notes. I do have a datasheet for a 2708 but that only says "it is customary to begin with the '0' address" and that there are two programming voltages, +12v on the PE pin and +25v pulse on the program pin. With that part, identified only as N2708 on the sheet, the pulse is 1.0ms minimum and the total time per location is a minimum of 100ms. Also of note is that the address setup in program mode is 1us minimum and the time between exiting program mode and the first valid read is 10us minimum. Lee. . ___________________________________________________________ Yahoo! Messenger - NEW crystal clear PC to PC calling worldwide with voicemail http://uk.messenger.yahoo.com