rideout wrote: > I compile the Microchip's AN510 Half Duplex in MPLAB and it compiled > ok. BUT when I trace through it, MPLAB does not pick up the RAM > assignments at location 08H. Any one know why??? Anything ya got would > help. Location 08H is for EEDATA, it is used when you are reading or writing data to the EEPROM of the F84. General purpose registers on the F84 starts at 0CH up to 4FH. regards, Reggie