[GreenKeys] [External] Re: Teletype DRPE tuned reed mechanism

[Eric Moore]

Hey Doug, good luck with the punch block!

My SEL 810A paper tape punch interface is the teletype model 33 ASR, but
just like with the paper tape reader it could be switched from the teletype
to a high speed option (for reader it is a Digitronics) with the right
control electronics, and I believe the BRPE was that option.

Do you happen to know what device was used for punching 8 level paper tape
prior to 1954?

-Eric

On Mon, Dec 28, 2020, 8:50 AM Jones, Douglas W <douglas-w-jones at uiowa.edu>
wrote:

> On 12/27/2020 09:26 PM, Eric Moore wrote:
>
> > What were the primary real world uses for the BRPE?
>
> I bought my BRPEs from a Michigan typesetting company that had piles of
> them.  Evidently, they were used to punch tape from a computerized
> composition system to be read by typesetting machines.  Both the punches I
> got are 6-level with offset sprocket hole.
>
> The 1965 vintage PDP-8 computer I'm restoring has a high-speed paper-tape
> punch interface designed to drive an 8-level BRPE punch.  just a few years
> later, Digital Equipment Corp came out with their own 8-level high-speed
> punch, but they (and much of the rest of the computer industry) used BRPEs
> to start and only later came out with their own high-speed punch.
>
> I need to combine parts from the two punches to make one 8-level punch.
> That means manufacturing a new punch-block if I can't find an old one.
> I've gotten far enough to figure out that the manufacture of a punch block
> is entirely feasible, given machine tools that I either have or can get
> access to.
>
>           Doug Jones
>           jones at cs.uiowa.edu
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