So it seems in the early days of the PET a company by the name of Forethought Prouducts sold an expansion module called the BETSI which plugged into the expansion bus of the PET and gave you four S100 slots. If you google around you can find a flyer advertising the unit and optional power supply and the owners manual which touches on assembly, component locations and the schematics. It talks about adding sound voards, additional video outputs, expanding ram and attaching directly to a larger S100 frame. Beyond that I can find absolutely nothing else about it, much less a more recent photo of one. Has anyone here ever used one? How practical were they in reality? Suppose I went and built one. Does anyone have the PCB layout templates so I could get a board etched or will I have to stick to the schematic and build one by hand? -John

So it seems in the early days of the PET a company by the name of Forethought Prouducts sold an expansion module called the BETSI which plugged into the expansion bus of the PET and gave you four S100 slots. If