rfarris@rfengr.com (Rick Farris) (07/26/90)
Greetings, Would someone please explain to me the manufacture of (internal) SCSI 50-pin cables? I have 2 drives in my system now, and note that the connector for each drive is on the same side of the cable. (Which, incidently, is on the other side from the controller connector.) To add a third drive do I simply (conceptually) crimp yet another connector on the same side of the cable as the other two drive-connectors? Is that the preferred method? I seem to remember seeing a funny looking t-adaptor thingie. Was it really a t-adaptor to allow drive chaining, or did it have another use? Where do they come from? -- Rick Farris RF Engineering POB M Del Mar, CA 92014 voice (619) 259-6793 rfarris@rfengr.com ...!ucsd!serene!rfarris serenity bbs 259-7757
johnm@voltron.asd.sgi.com (John F. Malia) (07/26/90)
In article <1990Jul26.034336.23202@rfengr.com>, rfarris@rfengr.com (Rick Farris) writes: |> |> I have 2 drives in my system now, and note that the |> connector for each drive is on the same side of the cable. |> (Which, incidently, is on the other side from the controller |> connector.) |> |> To add a third drive do I simply (conceptually) crimp yet |> another connector on the same side of the cable as the other |> two drive-connectors? |> |> rfarris@rfengr.com ...!ucsd!serene!rfarris serenity bbs 259-7757 Addressing the issue of connector orientation, it really doesn't matter which side of the cable the connector is on, as long as proper orientation is maintained regarding pin #1 of the connector and wire #1 of the ribbon cable. John Malia ::-{Q Silicon Graphics, Inc. | There's no place, anything like this AS Division 2011 Shoreline Blvd. | place, anywhere near this place, I/O Systems Dept. Mt. View, Ca. 95034 | ...so this must be the place! ************* What I say is what *I* think, not what SGI thinks ************
colin@array.UUCP (Colin Plumb) (07/28/90)
It doesn't even matter which side of the cable you crip the connector on. Just get pin 1 to the right place, and all will be happy. SCSI cables require termination at the ends, but the standard way of doing that is by socketed resistor packs on the SCSI devices which you remove from anything in the middle. Thus, the cable has no special termination requirements. (Just watch the stub lengths! T-junctions are very, very bad!) (If the connector isn't keyed, it's impossible to crimp it on to the cable in the "wrong" way, although the little pin-1 triangle can be misleading if it's on the pin 50 end of the cable. I am assuming, of course, that you are not one of those Ingenious Fools which make customer support such an *interesting* job.) -- -Colin