clark.wbst@PARC-MAXC.ARPA (09/30/83)
Someplace I have seen... does anybody know where I can get this, or something like it? ... A short jumper to go between wire-wrap pins. A short (1/4"?) cylinder slid over the pin, and the pin went right through, out the top. A wire went to another sleeve for the other pin. The result was that the whole deal did not stick up higher than the top of the wire-wrap pin. What I need to connect is the NPG continuity jumper on a UniBus backplane. To get from one pin to the other you go up 0.125" and left 0.125", so it is 0.177". I can't imagine anyone making a little jumper with that fixed distance, but... I want to be able to remove and add it very easily, without playing with wire-wrap wire, yet do not want something kludgy like a piece of bent solid wire, since it will be done by non-hardware types. Any help would be greatly appreciated ! --Ray Clark Clark.wbst Clark.wbst@parc-maxc EEvax.clark.wbst@parc-maxc allegra!rocksvax!clark depending on where you are....
RBENTLEY.ES@PARC-MAXC.ARPA (10/01/83)
I am the tool coordinator for PSD and part of the Xerox Multinational Tool Committee. currently we use jumpers for backplanes for troubleshooting but could just as well be used for your purposes. They may not be as short as you require but you can check them out anyway. They are orderable through National Distribution Center in Compton California. they are as follows; 600T1046 Jumper Wire 3" 600T1047 Jumper Wire 6.5" 600T1048 Jumper Wire 10" 600T1049 Jumper Wire 27" A local contact in Webster would be Bob Metz. This jumper works so well and is so easy to use that the it is used quite a lot. Hope it helps you. Roy Bentley
dmmartindale@watcgl.UUCP (Dave Martindale) (10/11/83)
My favourite way to put in a temporary NPG jumper while a Unibus DMA card is removed is to take a blank Flip-Chip card (DEC used to sell these, maybe they still do) and wire the foil at positions A1 and B1 together. Then you plug this into the backplane in the row just above the grant continuity card and you have provided continuity for NPG as well. Even better, I believe that one of the DEC-lookalike vendors (Able?) makes a card which plugs into rows C and D, providing the function of both the ordinary grant continuity card plus the NPG card described above. Also, it is the length of a normal card and has handles on it so you can insert and remove it without mangling your knuckles! I think this would be the way to go for non-technical people; it makes it much more difficult to short together the wrong pins, and it also eliminates the danger of putting the continuity card in upside-down or in the wrong row. (I'm sure I'm not the only one who's done this...) Dave Martindale allegra!watcgl!dmmartindale decvax!watmath!dmmartindale
twt@uicsl.UUCP (10/18/83)
#R:watcgl:-94400:uicsl:7000028:000:220 uicsl!twt Oct 17 20:18:00 1983 DEC now uses a "grant card" like the one mentioned above in the 11/24's and 11/730's. The DEC part number on the handle is G7270. I don't know if you can get it from DEC or not. Tom Todd ...pur-ee!uiucdcs!uicsl!twt
smh@mit-eddie.UUCP (Steven M. Haflich) (10/18/83)
I cannot recommend the following kludge without reservations, but have used it in years past when expedient without difficulty: A Unibus NPG jumper can be constructed from a miniature SPST slide switch wire wrapped to the appropriate backplane pins. The leads must be kept short, of course, and the biggest difficulty is affixing the switch and wires *securely* so they cannot become caught on anything. This latter is partcularly important if your backplane s mounted on slides! Steve Haflich, MIT Experimental Music Studio
hoffman@pitt.UUCP (Bob Hoffman) (10/27/83)
DEC now has a dual-width, extended length "double-grant" continuity card. It's part number G7273 and it plugs into the C and D connectors of a hex SPC slot. I had never seen one until last week when our new 11/24 was delivered. It's certainly an improvement over the old G727 cards. ---Bob Hoffman, U. of Pitt Computer Science.