Rich, this is clearly a bug. Other routines that are not available in edit mode return an error message (like INPUT), ACCEPT does not. That is a bug. If none of the routines did it, you could argue that it is just bad design, but clearly the programmers at TI thought it important to provide an error message when a program mode only routine is used in edit mode (they were right) and they simply forgot to do the same for ACCEPT. I'm pretty sure the original programmers would consider this a bug as well.