HP-97S PRODICAL Digital Micrometer - Printable Version +- HP Forums (https://www.hpmuseum.org/forum) +-- Forum: HP Calculators (and very old HP Computers) (/forum-3.html) +--- Forum: General Forum (/forum-4.html) +--- Thread: HP-97S PRODICAL Digital Micrometer (/thread-5643.html) |
HP-97S PRODICAL Digital Micrometer - aj04062 - 02-05-2016 01:25 AM Just thought I'd post up some pictures of this purpose built 97S I got 4 years ago (Bob P!). I have never seen any mention or reference to it, but I may have missed it over the years. Photo 1 Photo 2 Photo 3 RE: HP-97S PRODICAL Digital Micrometer - Katie Wasserman - 02-05-2016 07:35 AM That's an interesting item! How does the communication work - software wise - between the 97s and the micrometer. Do you set one of the user flags to indicate that the micrometer should feed a measurement to the 97s? What sort of electronics are in the box that's between the i/o pod connector and the micrometer? RE: HP-97S PRODICAL Digital Micrometer - aj04062 - 02-06-2016 02:05 AM I haven't rebuilt the card reader to run the cards yet. I plan to soon. I'll scan the manual. Check these photos out of the internals of the adapter: Photo 1 Photo 2 Photo 3 How do I embed a photo anyways? RE: HP-97S PRODICAL Digital Micrometer - Katie Wasserman - 02-06-2016 02:27 AM All 4000 series CMOS chips, same as used in the i/o pod. While pretty standard stuff for back then, I wonder if the HP engineers had a hand in designing this too. The 2 main chips, 40108, were likely used to buffer serial data from the micrometer so that it could be feed to the BCD inputs on the i/o pod in one shot. The i/o pod did just the opposite, taking the BCD digits on the input, one at a time, and feeding them to the 97s. RE: HP-97S PRODICAL Digital Micrometer - sleibson - 02-06-2016 03:31 AM The tan muffler was originally the case for a 9815A I/O card. It's a BCD interface muffler from all appearances, which makes sense since we're dealing with simple numeric data here and an HP97S came with a BCD interface, using the 9815A muffler as a backfit. The micrometer has a numeric display so the data is clearly available as BCD info, which swims down the coil cord into the big kludge of an I/O box. I'm guessing the little gray box is a level translator and a serial-to-parallel BCD converter and latch to make the scanned micrometer digits available in parallel to the 97S BCD interface box. What a great lashup. --Steve (02-05-2016 07:35 AM)Katie Wasserman Wrote: That's an interesting item! |