Quote Originally Posted by lecoind View Post
THE ONLY CHOICES I HAVE IS THE 16F877 IN MICROCODE STUDIO. I HAVE HAD THE PROGRAM FOR ABOUT 4 YEARS NOW. IT MIGHT BE OUT DATED BECAUSE IT DOES NOT LIST THE 877A. HOW WOULD i UPDATE?
Why are you screaming so loud here ?????

The 877a has options and registers not know by the 877 (without a).
So, switch to the right compiler-option or read the datasheet so declare the register on your own.