Tandy TRS-80 Model 4

I certianly agree with that. I don't collect ornaments. I collect computing machines (and related stuff). The purpose of those is to run programs, not to lokk pretty on the shelf. But I don't feel that is mutually exclusive with 'keep them as original as possible'. The 'as possible' bit covers replacing faulty parts so that the machines can run again. But I replace the smallest part possible. Obviously I don't have an IC fab line, so if a chip fails I have to replace it. Maybe not with the same type but with a compatible one, or worse with one that needs minor mofifications to the rest of the machine for it all to work. But I replace the chip. I don't replace the entire PCB. Similarly, I cna't repair a disk drive head. But I can replace the head carriage, and keep the rest of the original drive in the machine. Or, as I did recently, replace a track 0 sensor microswitch with an almost indentical part (the only difference was the manufacturer, from what I could see). Sometimes I do try to repair the original part, if there's no suitable new replacement. I've been known to rewind motors, for example. Of course what is 'possible' depends on who you are. But I try to take the view that if it's something I've not repaired before then it's a way of learning how to do something new, not a problem that I'll never manage to solve. -tony