I wrote a similar program to this in GFA BASIC and it appeared in START Magazines' 2/90 issue as X10 CONTROLLER. Since I wanted to learn ASSEMBLY LANGUAGE I decided that this would make an ideal package to use as a learning tool. This is a total rewrite in ASSEMBLY LANGUAGE and I think easier to use than the original version. The X10 DIAGNOSTIC feature under OPTIONS is disabled for the FALCON 030 because I can't get it to work. Since the DEBUG feature of DEVPAC 3 doesn't work on the FALCON I was unable to get into the program to find out why. When and if they ever fix DEVPAC 3 for the FALCON I'll correct it. Also, since I don't own or have access to either an MSTe or a TT I'm not sure if the ASSGN SER PORT under OPTIONS works properly, maybe some kind soul with either of those machines will test it out and let me know.