[[http://labo.main.jp/newage/towns/fmt_model.html|According to this website]] and also my own experience with disassembling and documenting these computers. \\ The very easy way to tell the difference between the 4 types of tower models is to specifically look near the power button area on the front and the LED/buttons in the front. Pay attention to it carefully. All tower models come with a 386 CPU. Generation 1\\ MODEL 1, MODEL 2, S1, S1 \\ \\ Parts are not as interchangeable. Requires a SCSI card in order to use hard drives which are external only. Power Supply card different than other 3 generation tower models. CPU has a socket so it can be upgraded. {{:fm_towns:fmtg1.jpg?400|\\ \\}} Generation 2\\ "F" Family of parts \\ CPU has a socket so it can be upgraded. {{:fm_towns:fmtgen2.jpg?400|}} Generation 3 \\ "0F" Family of Parts {{:fm_towns:fmtgen3.jpg?400|}} Generation 4 \\ CX Family of parts. Has FAST mode for software that supports it. {{:fm_towns:fmtgen4.jpg?400|}}