The color pairs aren't what I'm used to, but hopefully you can trace them back to the PDP-8 and find out what they are from that end. Two documents which should help: -The LT33 print set shows a basic PDP8-to-ASR33 connection on the second page. Four of your six lines go to terminal lugs on the ASR-33; the other two, for reader control, go to a relay card designated "4915" which gets tied into the reader's power supply. Yes, there's instructions on where the 4915 goes, though they don't really describe the 4915 to any useful level. There's also a diagram of the "Mate-N-Lock" connector DEC used at the time, which may be all you need - though your color pairs are different from their description, so you may have to trace them out. The LT33 doc is at: http://www.pdp8online.com/pdp8cgi/query_docs/tifftopdf.pl/CHD/LT33_print_se… The PDP-8/I Maintenance Manual has a drawing (figure 5-7, page 5-16) which shows the PDP8-ASR33 connection in schematic form; it actually describes the 4915 enough to be almost useful. :) http://bitsavers.org/pdf/dec/pdp8/pdp8i/DEC-8I-HR1A-D_8Imaint_Mar70.pdf Hope these help! -O.-