Re: [TUHS] Spider

Paul Ruizendaal writes: Again, very fuzzy memory here but there are a few folks on the list who might remember more like Heinz. As I said earlier, I recall Sandy being in our group so our network may have been the first try. I don't know who designed it. The GLANCE G was an experimental graphics terminal developed in our group. I think that John Camlet did a bunch of the hardware design as I have a strong memory of a long afternoon with him after having weird squiggles show up in short vectors which turned out to be a microcode bug. The thing had 4K resolution in at least one axis, it may have been a square screen. It used 1K DRAMs and was built around a 74S181 bit slice machine. A lot of interesting stuff was done on it; I mentioned Dick Hause's Display Terminal Editor in an earlier post. I also remember a really nice graphical demo of how the phone network routed around outages which of course no longer works due to lack of redundancy. Oh, yeah, the real use for these comes back to me :-) A number of the folks in the group including Carl Christensen (who was one of the two people who interviewed Ken for his job at the labs) had purchased property up in Vermont for ski cabins. These lots had ancient surveys, the old "from the big tree near the large rock" sort of property descriptions. So the main use of the Glance G's for a while was to draw out the surveys and figure out what to do about closure errors. If you don't know about it, and this is the only reason why I do, a closure error is when you follow the property boundary described by the survey and the end isn't at the beginning. Anyway, these were very cool machines for their time. I don't recall any other graphical devices at the time except for glass tty terminals, Tektronix storage tubes, and the GRIN-2 on the PDP-15 that we used for space war as per earlier posts. Dave Hagelbarger designed the keyboard and to this date it's still one of the best keyboards that I ever used as far as feel goes. It had plastic cups under the keys that gave resistance and then accelerated after a certain point so you pushed on a key and then it would shoot the rest of the way. And there was a solenoid on the bottom of the circuit board so there was a little click that you felt in your fingers. Great feedback. There were some extra parts left over from building these. I remember that Joe Condon had the glass shop do some work on an extra or dead CRT, and one of the terminals in his office was actually a fish tank. When you turned it on a light would come on behind the tube and you could see the fish swimming around in it. Maybe Joe deserves credit for the original fish screen saver. Oh yeah, another thing that I remember being tried was that someone had built an array of LEDs and photodiodes surrounding the screen that could be used as an input device. It was low res but you could point at things with your fingers. One of the projects that I did was to write software for nicely plotting graphs on these. Was used a bunch by Jim Kaiser and crowd for their digital filter work. I remember a really nice graph that Jim did that showed just how carefully the touch tone frequencies were chosen to have no harmonics in common. This isn't really UNIX stuff but I suppose that it passes for prehistory. Again, I seem to recall that one of these was up in the UNIX lab but have no memory of what it was used for. If I had to guess, it would be chess. Oh yeah, I think that you can see the GLANCE G instruction set if you have a first edition copy of Newman and Sproul. I remember getting a copy of that book and having a weird sense of deja vu during their discussion of vector graphics. Then I realized that it was because it was the instruction set that was burned into my memory. Jon