[GreenKeys] [External] Re: anyone know the details of this unit?

[Nick England]

I have something better than my own Bridgeport milling machine - I have a
buddy with a Bridgeport. John Poulton K4OZY took on the challenge of making
the new 5-level punch block parts.

Nick England K4NYW
www.navy-radio.com


On Sun, Mar 30, 2025 at 9:20 PM Jones, Douglas W via GreenKeys <
greenkeys at mailman.qth.net> wrote:

> From: W2HX <w2hx at w2hx.com> -- Sunday, March 30, 2025 7:31 PM
> > I just wonder if there is any hope of converting this to 8 or 5 bit
>
> See the end of this web page for enough information to manufacture the
> parts needed to convert your 6-bit punch block assembly to a 5-bit punch
> block.  I think it was nick at navyradio.com who worked this up, but the
> metadata on the PDFs say John Poulton:
> -- https://www.navy-radio.com/tty/brpe.htm
>
> (the notes on the plans suggest he might have made 6 kits.  To use one,
> you need the cast-iron center part of an old 6-bit block, plus most of the
> small parts removed from that block except the actual punch guide plates
> and die plate.)
>
> If you want an 8-bit block, you'll also need to have the cast-iron center
> part machined.  I've been working on drawings of that:
> -- https://homepage.cs.uiowa.edu/~jones/pdp8/UI-8/log2025.shtml#2025-03-20
>
> Once, several years ago, a lot of 10 8-bit BRPE punch blocks showed up on
> eBay.  Despite a serious effort to get it, someone not on GreenKeys got
> it.  We tried to contact the buyer to get a block and got no reply.  Who
> knows where those blocks went.  I haven't seen an 8-bit punch block for
> sale since.
>
>               Doug Jones
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