Does your TCL have three or four flexible conduits running from the back of the cabinet ?

If it only has three then it is probably not fitted with homing switches.

I don't believe the PC motherboard fits inside the case. There is a CPU board in there but that's just to read the various switches, take the control input from the serial port and generate pulses for the stpper drivers.

I believe Boxford will sell you a copy of the current software if you let them know the serial number of your lathe. From memory it was about £500 to purchase. I'm doing my own thing now so am not pursuing that route.

Adrian.