I don't know if I can buy that it is overrunning the buffer... All of the characters make it. Here is another funny outcome.. As you can see, my program ran perfectly, but when I listed the program, there is a "#" before the first line.. Where did that come from? It does it every time in this example. I almost wonder if the Monoprice USB to serial adapter is the culprit. I wonder if it has a fake PL2303 chip in it.. At least I was able to save my program to the CF card! Ohm, would you mind trying the exact same scenario with your TI RS232 card?