On Tue, 17 Feb 1998 13:16:03 -0400 Rawle Watson writes: > >My problem is that the contents of the registers which contain the >bypass >word is lost whenever the vehicle's battery power is removed then >replaced. Store the "bypass word" in the data EEPROM section of the chip, not the file registers. This is really an on-chip periperal (that only the X84 chips have) rather than an area of memory. Data can't be accessed as easily, and writing is very slow. But, the data EEPROM is intended to preserve data while power is off and it usually does. The file registers are ordinary static RAM and the data in them is lost when the power is off. A good car alarm should have its own reserve source of power, as many crooks will cut a battery cable to disable the alarm before tampering with the car. This doesn't address the major limitation of car alarms: nobody cares (other than the car's owner) when the alarm goes off. _____________________________________________________________________ You don't need to buy Internet access to use free Internet e-mail. Get completely free e-mail from Juno at http://www.juno.com Or call Juno at (800) 654-JUNO [654-5866]