I wrote my program into the EPROM. My program was suppose to o/p certain data through both the external and internal UART. However it only works for the internal UART. I was told that i needed some part of the monitor program to activate other components on the board before i could use them. Can anyone shed some light? How can i activate the external UART as well. Also wat is the use of the startup251.asm program? Thanks Ricky