hp calculators

I like my machines to work (I am more interested in what they do than what htey look like), so I rebuilt the rollers in my 65, all 4 67s (!), both my 97s and both my 41 card readers... One of my 67s was a disaster. It had been fiddled with before, One of the nylon bllas to sense the card was missing, and more seriously so was the tiny nylon pressure roller. The ball is a stnadard part so I could buy some but the roller isn't. That 67 now has a brass roller in it . But making somethign that small was not easy. Rememebr the 67 doens't have continous msmory so it is useful to eb able ot save your programs. Also there were some application Pacs avialable (which do turn up from time to time), I use programs from the Mechancial Engineer Pac quite often. The Games Pac is fun too (adn to me a lot more interesting than modern computer games). You;'ll be able to get an unoffocial schematic from HPCC, but unless it's a PSU problem or you have a donor machine you are probably right about it being beyond repair. The logic board contains 3 ROM chips and a 44-pin metal can which cotnaisn 5 silicon dice (Control&Timing, Arithmetic&Registers, 2 RAMs, card reader interface and clock buffer). Enough signals are brought out to be able ot tell which has fialed in most cases, but that's not a lot of use -) -tony