They look like diagnostic extender boards to me, for field service... Only one card is marked with the HP logo? These would allow you to run a card outside of the chassis of whatever device they were designed to service s.t. you could probe test points while it ran, or if you wanted to probe at the bus, you could bring the signals out from the chassis, which might have been difficult to fit probes in. These could have gone with practically anything... there's probably as much or better a chance that they are for use servicing a piece of test equipment (i.e. oscilloscope, spectrum analyzer, network analyzer, ...) than a computer. Best, Sean On Thu, Apr 23, 2015 at 6:56 PM, Justin Keogh <cctalk at v6y.net> wrote: > Hey everyone, I am new to the list, have a collection of 60's and 70's > hardware I am slowly selling, but these have me stumped (I am not an expert > in vintage computing): > > http://imgur.com/0SHTT9A > http://imgur.com/lJXbLjf > http://imgur.com/uPasyFE > http://imgur.com/W3eHes1 > http://imgur.com/A5GuF4Z > http://imgur.com/Wp2jKOb > http://imgur.com/KEiE9It > http://imgur.com/okDQVJQ > > > Anyone know what either of them are called or what system(s) they go to? > > Sometime in the next month or so, I will be auctioning off a complete > (working) Data General Nova 2, along with a few other very rare (from my > searches on this list) big items. > > Thanks! > > > -Justin Keogh > http://www.ebay.com/usr/jkeogh0 > >

Multibus extender boards.

On Thu, Apr 23, 2015 at 8:51 PM, Jon Elson <elson at pico-systems.com> wrote: Not Multibus. Multibus P1 is 43x2,at 156 mil pitch, like the larger board shown, but P2 is 30x2 at 100 mil pitch, while the smaller board shown is 24x2 at 156 mil pitch. An extender made for Multibus normally includes both as one board, with two card edges and two receptacles, though it is possible to use two separate extenders, or just the 43x2 if the board doesn't need P2, for instance, if it doesn't have more than 20 address lines.