The source code is fully organic and hand-crafted by myself and my brother Peter. Trs80gp provides accurate and near complete emulation with excellent programmer support. It should run well on any machine produced in the past 7 or 8 years. I’ve also heard it runs fine on OSX and Linux machines using Wine. The emulator runs under Windows 10 and probably works on Windows 8, 7, Vista or XP. The Model 2 has its own line of compatibles including the Model 12, which are not yet emulated by trs80gp. The Model 1, 3 and 4 are a line of compatible computers. It is generally easier to refer to them as the Model 1, Model 2, Model 3 and Model 4. They are known as the Model I, Model II, Model III, Model 4, Model 4P and Model 4D. Trs80gp emulates the “gray” line of TRS-80 computers made by Tandy in the late 1970s and early 1980s.