>> < If anyone has a VT103 and needs some help with
>> < how to set it up as well to convert to a 22 bit backplane,
>> < likely both Megan Gentry and I are able to supply the
>> < necessary technical information.
>>
>> I've built a few and have data as well.
>>
>> Allison
>>
>Someone -- post the wire wrap info...
If I remember correctly, you buss pins BC1, BD1, BE1 and BF1...
With a Q/CD backplane, that would mean just four sets of
wires down the AB side (BC1-BC2-BC3, etc, BD1-BD2-BD3, etc, etc)
For a Q/Q backplane, that would mean
BC1-DC1-DC2-BC2-BC3-DC3, etc (maintaining the serpentine)
BD1-DD1-DD2-BD2-BD3-DD3, etc...
BE1...
BF1...
or you could do what I did... bus the AB and CD sides separately,
then wire-wrap one slot AB<->CD... Also, when I did it, I went down
to one of the Digital Stockrooms and picked up some specialized
'power strips' which were generally used for bussing DC on the
backplane, but could also be used to connect signal pins. It was
a copper strip which had alternating pin-sized holes and large
holes which wouldn't contact the pin... Perfect for connecting
corresponding pins of successive backplane slots...
Megan Gentry
Former RT-11 Developer
+--------------------------------+-------------------------------------+
| Megan Gentry, EMT/B, PP-ASEL | Internet (work): gentry zk3.dec.com |
| Unix Support Engineering Group | (home): mbg world.std.com |
| Compaq Computer Corporation | addresses need '_at_' in place of ' ' |
| 110 Spitbrook Rd. ZK03-2/T43 | URL:
http://world.std.com/~mbg/ |
| Nashua, NH 03062 | "pdp-11 programmer - some assembler |
| (603) 884 1055 | required." - mbg |
+--------------------------------+-------------------------------------+
Received on Tue Aug 18 1998 - 12:15:05 BST