> On Dec 21, 2022, at 7:16 PM, Steve Malikoff via cctalk > <cctalk@classiccmp.org> wrote: > > For a DLV11 EIA serial connection, I am about to wire up a fly lead cable to > go from an M7940 SLU (no dash version) 40-pin header to a DB25P … I could use > any colours but I'd really like to use the original colours for the above …
The BC05C cable is described in full, including wire colors, in the docs for the Unibus DL11 (for example, PDF page 21 of the engineering drawings at http://www.bitsavers.org/pdf/dec/unibus/DL11_schem_Mar78.pdf, or table 3-6 on PDF page 34 of the user manual at http://www.bitsavers.org/www.computer.museum.uq.edu.au/pdf/DEC-11-HDLAA-B-D%20DL11%20Asynchronous%20Line%20Interface%20Manual.pdf) Specifically, for the pins asked: J - receive data - orange/white F - transmit data - white/blue E/M - interlock - red The ground wiring is a bit involved: Pin 7 on the D-sub is connected multiple: - cable shield to Berg B - brown/white to Berg UU - black jumper to D-sub pin 1 …and pin 1 on the D-sub is connected multiple: - cable shield to Berg A - blue/white to Berg VV - black jumper to D-sub pin 7
