On-Screen Takeoff supports GTCO branded digitizers and On Center Software's Digital Takeoff Table™. For instructions on setting up the Digital Takeoff Table, please refer to the documentation that came with your product.
The following articles explain how to setup and use a GTCO brand digitizing board with On-Screen Takeoff.
If you'd like to chuck your digitizer but were not provided electronic plans, check out: 10.09.00 Using Paper Plans for some options.