Wire Wrapper needed for PDP-7

From: Paul Koning <pkoning_at_equallogic.com>
Date: Mon Feb 9 08:20:07 2004

>>>>> "Tom" == Tom Jennings <tomj_at_wps.com> writes:

 Tom> THere's a variation in wirewrap gun types, the fist turn is
 Tom> with/without insulation. I've only done prototype stuff that
 Tom> does the turn of wire-plus-insulation, for added strength.

Yes. If the first turn has insulation, it's called a "modified"
wrap. The difference is in the wrap tool bit -- the bit for the
modified wrap has a bore for the wire that accepts the insulation up
to however far it needs to go to make that one wrap around. This
means that you have to be careful to seat the wire fully into the bit.

Modified wrap is stronger. The drawback is that it has more
inductance. You'd want to look at the original work to see which was
used and apply that to new work too.

For high speed logic, modified wrap would be a bad idea. I suspect
PDP-7s are not "high speed", and indeed I'm fairly sure that PDP-11s
used modified wrap too. On the other hand, a University of Illinois
project I've seen was done with ECL logic and standard wrap. (That
was for Cyber add-on memory.)

        paul
Received on Mon Feb 09 2004 - 08:20:07 GMT