Has anyone used the Tape Twin BTR system by CMC? It looks like it was made in about 1994. I got this unit a few years ago with some spare parts for my Series 1 BOSS 5 Bridgeport and just recently hooked it up. I did get it to work fairly easily by experimenting because it was still hooked up to the old unit and simply plugged it into mine. It seems to work by sending only one line at a time to the machine. It looks like some other units for the old BOSS controls send out enough program to fill the memory then stop and load more but this one doesn't seem to work that way. It looks like it originally ran off of a floppy but was reconfigured to use the hard drive. I did call the support number in the manual and they said they haven't sold or supported them for at least 5 years now. I was just interested to find out if anyone else has used this system or what other systems people have used on the older BOSS 4, 5 or 6 controls.