The Tandy TRS80 Model III, as delivered, did not come with a green screen. Either the machine has been upgraded (requiring a different video board) or it is not a Model III. I may be able to help you either way as I have been repairing Radio Shack computers since 1979. You could help me answer your questions by answering the following questions: 1. Does the computer have a silver or cream coloured cabinet? If the cabinet is silver in coulur, it is a Model III cabinet and the innards may have been renewed. As the Model III and Model IV (non-gate array) use the same footprint for their internal circuit boards and drive towers, they are easily interchanged. 2. If the cabinet is cream couloured it is most likely a Model IV gate-array. Robert M. (Bob) Donan E-mail: donan(a)utk.edu Graduate Teaching Associate Department of Human Resource Development The University of Tennessee 310 Jessie Harris Knoxville, TN 37996-1900 (423) 974-2574 Department. (423) 579-2808 Residence