HP HP-2117F on ebay

Glen wrote.... It gets even more convoluted because some of the complete part numbers (12566-XXXXX) refer to the "same" board but later field replacement vs. original issue. So two boards with different part #'s may be the "same" board. My CE handbook has some of these new vs. field replacement board translations, but certainly not all of them plus it changed over time. You mention GRD true & + true both being 12566-80024... I suspect you're looking at the pca assy # rather than the part number or vice versa. They are both on the same spot on the board. These two boards would not have the same part number I don't think. I THINK from foggy memory that the original issue boards for grd tru were 12566-6001 and + true were 12566-6002. I'd have to dig to be sure... maybe the + true version was ordered as 12566 option 001? I don't recall. As I said in a previous post... there's a fair number of jumpers on the older style 12566 boards, and all those jumpers are solder-type. Several of those jumpers are four post jumpers (central jumper with 3 option selections) and the options aren't mutually exclusive. I imagine many people use a 12566 for a single specific thing, so they set (solder) the jumpers a certain way and they never need to change the jumpers again. I however tend to bounce 12566 boards around in lots of different configurations for different things in different machines on a regular basis. Back when I was messing with my HP boxes a lot it wasn't uncommon for me to want to change the jumpers on a 12566 several times a day. It's rather irritating to have to get out a soldering iron just to try a 3 second "what if I set it this way" scenario. There's another reason - I don't remember the exact specifics... but the diagnostics for the 12566 board require certain of the jumpers to be set a certain way I think. One of my applications (TSB interconnect kit I think) required those same jumpers a different way. So to run diags, I had to break out a soldering iron and then put them back to use the board. Not a huge deal, but irritating. And no, I'd rather not mount a custom switch to my board unless I absolutely had to. Well, the later model 12566 boards that I prefer (Microcircuit/12566-60032) have plug jumpers instead of solder jumpers. So I can change jumper settings in a second or two and put them back quickly a moment later. In addition, I recall there being some extra features on the -60032 boards that looked like they would be handy if one was building a custom device... Jay West