>target being a C54. The latest project I got it working fine with the >C84 and then changed the processor to C54, compiled and burned a window >part (C54), but the thing wouldn't work...tried also with a target of "Doesn't work" might be fine for Microsoft to blame somebody else, but not descriptive enough here. Check the electrical specs on your parts and the operation of your circuit. The '5x has 0=.15Vcc, 1=.35Vcc. Most if not all newer ones have 0=.15Vcc, 1=.85Vcc. That leaves a much bigger gray area between them. Andy ================================================================== Andy Kunz - Montana Design - 409 S 6th St - Phillipsburg, NJ 08865 Hardware & Software for Industry & R/C Hobbies "Go fast, turn right, and keep the wet side down!" ==================================================================