Hey Rick, I have some info on these machines. I bought one in the late 80's as a kit. It was a 903 and used Lpt indexer as the software to run it. Later we upgraded to Microsystems CNC controller Dos version. We now use Microsystems Wincnc on machines we build. They machines are very good machines as a rule. Later when Digital Tool went out of business (bankrupted) some of the previous owners started DT Technology. They also had good machines. In many ways they were overbuilt. If your drivers are in a black or blue box that is from Anaheim automation you probably have a 1/2 stepper system. If the control software is by Microsystems it uses G-code and if could be either one if it is a LPT systems. Years ago I bought out a lot of there stock when they went out of business and I might have a few parts if you need them or at least tell you where to get them. Feel free to call me if you need any help. Bill Glenn @706-639-9177 or cell 706-463-0656 Hope you enjoy your machine.