On Thu, Jul 25, 2019 at 10:09 AM Douglas Taylor via cctalk <cctalk@classiccmp.org> wrote: > > I'm putting together a MicroPDP-11/23 in a BA23 box. Have the M8189 CPU > quad width board and the bulkhead cabinet kit, with two DB25 connectors > and switches to set the baud rate. On bitsavers the 'MicroPDP11 system > technical manual' shows how to set jumpers on the M8189 to allow this > cabkit set the baud rate, but only briefly mentions the cables needed. > > Does anyone here have a anatomically correct MicroPDP-11/23+ in a BA23 > box and can tell me how the cabling goes from the M8189 CPU board to the > bulkhead cabinet kit?
I might have a console panel for an M8189 KDF11-B 11/23+. If I do, I couldn't find it the first couple of places I looked. Or maybe I have a console panel for an M7554 KDJ11-D 11/53, I forget which one, or both, or neither that I have. Anyway, back to the cable for the console panel for an M8189 KDF11-B 11/23+, isn't that just a 20 conductor ribbon cable that attaches to the 20-pin connector on console panel, then on the M8189 end it splits in the middle into two 10 conductor halves for the two 10-pin connectors on the M8189? To use the baud rate switches on the console panel the M8189 needs to be jumpered for external baud rate generation. The console panel contains a baud rate generator which feeds the baud clock into pin 1 of each of the two 10-pin connectors.