OK. I was trying to build it into the source if possible. A long time ago I had a compile that had this built in, so when ever you hit the P command, it would dim and display "PAUSED" in the center of the screen. Seems like it would be as simple as calling one of the "build menu" functions that show other information on MAME and pass the string "PAUSED" to it for the content, but i am not for sure. Figured someone probably had a handle on it since I had seen it done at least once before.