DEC Computer Lab for sale

[Mike Stein]

Sorry, these pins are smaller: .056" - .068'.

m

On Sun, May 30, 2021 at 6:02 PM Vincent Slyngstad <
vincent.slyngstad at gmail.com> wrote:

> On 5/30/2021 1:02 PM, Mike Stein wrote:
> > What's the length and the diameters at each end of the pin? I've got
> > some cables for Burroughs patch panels that might be useful.
>
> The pin diameter at the rounded tip is .093", a standard pin diameter.
> It flares to 0.102" or so, over about 0.34" of length.  The overall pin
> length (including the insulation crimp/strain relief) is about 0.65".
>
> Also measured some patch cords (pin tip to pin tip):
> Brown is 2.75".
> Red is 4.75".
> Orange is 6.75".
> Yellow is 8.75".
> Green is 16.5".
> Subtract about an inch and a quarter for the length of the visible wire.
>
> There was also blue, though I don't have one to measure.  My notes
> remind me that the blue looks about an inch or so longer than green,
> based on the cover photo of the manual. At that length it will
> comfortably reach across the device, whereas the green is just a little
> short for that.
>
> Found in my old notes:
> The DEC 12-03498 was a #41675 taper pin.
> Similar AMP taper pins:
> 42107 "88" series will fit.
> 42279 is similar, though obsolete.
>
> My old notes also suggest higher quantities for the patch cords; 100 of
> them all together:
> B 20
> R 30
> O 25
> Y 20
> G 10
> B  2
>
>         Vince
>
> > On Sun, May 30, 2021 at 3:40 PM Vincent Slyngstad via cctalk
> > <cctalk at classiccmp.org <mailto:cctalk at classiccmp.org>> wrote:
> >
> >     On 5/30/2021 10:54 AM, Ethan Dicks wrote:
> >      > On Sun, May 30, 2021 at 11:42 AM Vincent Slyngstad via cctalk
> >      > <cctalk at classiccmp.org <mailto:cctalk at classiccmp.org>> wrote:
> >      >> https://so-much-stuff.com/pdp8/computerlab/computerlab.php
> >     <https://so-much-stuff.com/pdp8/computerlab/computerlab.php>
> >      >> The photos get a little bigger if you click them.  Those bits of
> >     stamped
> >      >> brass or whatever they are made of were probably pennies each.
> >      >
> >      > I've thought about what it might take to manufacture a pair of
> steel
> >      > rollers that could stamp those out but I haven't gotten very far
> with
> >      > it.  Same idea for the backplane bus strip DEC used to sell on the
> >      > roll.
> >      >
> >      > Depending on level of detail, either a small CNC or possibly a
> wire
> >      > EDM could make the dies.
> >
> >     I thought about machining a ram to deform an existing modern pin (or
> >     even just tubing) to create the taper.
> >
> >     I also tried to cast some out of solder, but they had bubbles and
> >     were a
> >     little too soft (tin-lead solder).  Also, with a solder connection
> you
> >     really need a good strain relief.  At some point it's too much work
> for
> >     what you're accomplishing (and still not very authentic).
> >
> >              Vince
> >
>
>