At 9:10 PM -0400 9/24/12, Dave McGuire wrote: I have to agree with Dave. Huh? I'm not sure if it's pertinent here, as I'm not sure what the point of the original post is, but something Chris Tofu might want to remember is that a lot of us on this list have been members, and known may of the people on this list, longer than we care to remember. Yeah, that statement falls into the "Geez I'm getting old", category. ;-) Zane -- | Zane H. Healy | UNIX Systems Administrator | | healyzh at aracnet.com | OpenVMS Enthusiast | | | Photographer | +----------------------------------+----------------------------+ | My flickr Photostream | | http://www.flickr.com/photos/33848088 at N03/ | | My Photography Website | | http://www.zanesphotography.com |

Welcome! The BAD news: Now you are "one of us"

On Mon, 24 Sep 2012, Chuck Guzis wrote: Braided or foil?

On 9/24/2012 9:18 PM, jim s wrote: Did I miss something that happened on this list ? What was the OP on about ?

At 10:56 PM 9/24/2012, you wrote: I believe one needs both, with a drain wire, for flex resistance and maximum coverage. 853 . Wit levels low. Attempting to compensate. NEW: a50mhzham at gmail.com ? N9QQB (amateur radio) "HEY YOU" (loud shouting) ? Second Tops (Set Dancing) ? FIND ME ON FACEBOOK 43? 7' 17.2" N by 88? 6' 28.9" W ? Elevation 815' ? Grid Square EN53wc LAN/Telecom Analyst ? Open-source Dude ? Musician ? Registered Linux User 385531

oi I guess it was only clear to me IT WAS A JOKE. Hee hee, ha ha. There was something (back in the day) known as ROI, ribbonized organized integrated wiring. Not sure what it's purpose was, to diminish emi/rfi or not (must have been, seeing I was employed in an EMI testing facility). You amateurs forgot about that (AGAIN IT'S A JOKE). I went to bed, and even dreamed whether I was getting the acronym correct. Or you could just opt to killfile the fool.

________________________________ From: Dave McGuire <mcguire at neurotica.com> On 09/25/2012 01:43 PM, Chris Tofu wrote: ? Oh.? Honestly, it didn't come across that way.? Limitations of ASCII, etc.. C: Yeah but who types - quote, unquote - ??? Doesn't it make much more rational sense to enclose it in actual quotes??? ? Ahh.? I don't really consider myself an amateur (been feeding myself for a long time doing this stuff) but I've never heard of it by that name.? It sounds like you're describing twisted-pair ribbon cable. C: I don't consider you an amateur either. But it was designated by an acronym back then, this I know because a wad of docs were stuck in me hand. They may have dropped the usage since, don't know. ? Eh, I just delete.? No biggie. C: There's the spirit!

On 25 Sep 2012 at 14:14, Curt @ Atari Museum wrote: Still made, AFAIK. Google/search "Spectra Strip" for whoever owns them now (Tyco, probably) and note that one variation is the twisted-pair ribbon. Expensive stuff, however. --Chuck

'Twist-n-flat' ribbon cable was very common, and was still in the catalogues last time I looked. That's ribbonm cable with twisted pairs that ahve untwisted bits (a couple of inches long excH) every so often so you can crimp IDC conenctors to the cable. Of course all 'flat' parts have the untwisted wires in the same order. That stuff was very common for disk drive cables, etc. I would guess tour CDC cables are for SMD drives, which used differential ECL signals IIRC. Tiwsted pairs are of course ideal for such signals. -tony

Ecer come across a twisted pair _PCB track_? The HP9810 and HP9820 keyboard encoders need to feed a low level alanloge signal (the output of the keyboard sense loop) from the eddge commector to the keyboard itself to an analogue comparator cirucit at the other end of the encoder PCB. Fortunately the comaprator has differnetial inputs, the source of this signal is fully floating. I don't know if it depends on the version of the PCB, but the encoder in my HP9810 (and indeed in the other HP9810's I've worked on) uses a bit of twistwed pair wire for this. The HP9820 encoder has a pair of PCB tracks, They zig-zag over each other and go through the board (with vias), thus forming a twisted pair of conductors. It looks very odd... -tony

Sure. When I started using ECl, it was emphasised to me that ECL will work perfectly provided you design all the itnerconnections as transmission lines and terminate them properly. Some otheter logic familes will work -- most of the time -- if you use any old bit of wire. So they're easier to design with, but the glitches from reflecitons on interconencting wires, etc an bite you. As for termination, for small designs, you cna use a pair of reissotr,s one to ground, the other to the -5.2V rail. I think you want -2V at the tap, with the appropriate impedance. Or a simple resistor of the right value to a -2V supply -- that's what the -2V rail in some old computers was mostly for. The latter has a lower power consumption on large designs. I made my own twisted pair wire-wrap wire. 2 spools of wire on a rod in the bench vis, the ends of the wirs in the chuck of a hand drill. Then walk aross the lab/workshop and get turning ;-). A bout 3 twists per inch gives a 100 Ohm pair IIRC. -tony

On Tue, 25 Sep 2012, Sam O'nella wrote: I'd be a lot happier if it could be arranged for all of C:\DERP>'s traffic to be carried in an RFC 1149 compliant fashion... g. -- Proud owner of F-15C 80-0007 http://www.f15sim.com - The only one of its kind. http://www.diy-cockpits.org/coll - Go Collimated or Go Home. Some people collect things for a hobby. Geeks collect hobbies. ScarletDME - The red hot Data Management Environment A Multi-Value database for the masses, not the classes. http://www.scarletdme.org - Get it _today_!