On 18/06/18 17:50, Al Kossow via cctalk wrote: The DECserver 200/MC had 8 DB25 connectors on the back, one for each RS232 connection. These connections had full modem control. The DECserver 200/DL had one 36-pin connector that broke out to 8 MMJ connections. Only the data leads were present (no modem control). I don't know how the motherboards differed between the two models. I wouldn't be surprised if the MC variant had 8 connections to the motherboard. I'm surprised the 200/DL didn't just put 8 MMJ connectors on the back of the box ... would have saved space and been less of a hassle thirty years later for people trying to run them! I don't have any service information (that I know of) for the DS200 unfortunately. Antonio -- Antonio Carlini arcarlini at iee.org

I wonder if that's a DECserver-100 board. I remember seeing a box (I thought it was a prototype but I may be confused) with a fairly small PCB inside a much larger rackmount-sized enclosure, with 8 separate wire bundles going from connectors on the board to the MMJ jacks on the front panel. The history supposedly was that the original design used a box the size of the board, with those connectors either exposed on the front or brought out to standard front panel connectors. Ken Olsen decreed that the connectors weren't acceptable and introduced MMJ, requiring the box to be redone but the PCB was kept. Or so I was told anyway. paul