" In some, the DVI plugs into the 40 pin expansion socket on the bottom. In another video, it was plugged into the parallel port, I think. The 40 pin expansion makes more sense to me."
The TRS-80 Model 100 has its system bus expansion port on the bottom. The Tandy 102, the successor to the TRS-80 Model 100 has its expansion port on the back of the unit. The connector looks like a parallel port, but is not a parallel port. The Model 100 and Tandy 102 have a parallel port but the connector looks and is compatible with the internal parallel port to motherboard cable used in PCs. -- John.