What is the code not doing? Can you load the code into the MPLAB simulator? Can you single step through it? I'm unsure how to assist without more information. Jim ____________________Reply Separator____________________ Subject: MPLABC-17 DOUBTS :( Author: WF AUTOMACAO Date: 7/1/98 3:31 PM Hi, This a program that i did for PIC17C756, and must be run in 2 external EEPROM TOO! If you see, the machine code are correct, start at 0000 address, goto _Setup_Stack (00c7 address), and goto main (00c2 address), but doesn't works! [...]