PDP-11/23+ serial ports

On Wed, Nov 27, 2013 at 08:34:16PM -0500, Christian Gauger-Cosgrove wrote: If that's true (sounds right to me), then maybe this will be useful: I did a tiny (practically free at OSH Park) PCB a while ago that adapts 10-pin ribbon cable to a DB25P (wired as DTE). It can work with a Berg connector, or if you use a Harting 09181109622 IDC header (which crimps directly to the cable and is much smaller than a header + connector) and a NorComp 976-025-010R031 shell (made for ribbon cable -- I got both from Mouser), then it fits neatly inside the DB25 shell. It's not a cab kit (unless you do some metalwork and panel-mount the DB25) but it works nicely. It has space for the current-limiting resistor that DEC wants you to use for DTR, if you're bothering with DTR that is. Photo / schematic / Gerbers are here: http://www.dbit.com/wilson/dlvdb25/ John Wilson D Bit