22 Dec
2022
22 Dec
'22
5:48 p.m.
On Dec 21, 2022, at 7:16 PM, Steve Malikoff via cctalk
<cctalk(a)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…)
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