I'm using MAPSMWIN v 01.40, with its associated .inc files. There are however two flags missing from the 12c508 include file, being the wake-up from sleep related ones. Which made me check up on some things.... I was just wondering if any of you have used this before, and whether I should take the (preliminary) data sheet seriously when it says that WAKE-UP from sleep due to a change on GP0/GP1/GP3 causes a RESET ? Jan van der Watt [I came, I saw, and what a party we had!]