goto TI-Philes and read the 'Calc-Off' source. -Phelan 'Amen' Wolf PS: Would EI (Enable interupts) work in a loop, so if I made an accidental loop I could press 'ON' ? Linus Akesson wrote: > Another question - how do I switch off the lcd and go into low power mode, > waiting for the on key? > > Linus