[GreenKeys] More BRPE progress: a schematic

[Eric Moore]

Hey Doug, my fully operational 8 bit BRPE and encoder is packed in a
pelican case and ready to ship if it would be useful to you.

-Eric


On Fri, Apr 18, 2025, 2:17 PM Jones, Douglas W via GreenKeys <
greenkeys at mailman.qth.net> wrote:

> Googling around, I found some BRPE schematics that differed enough from
> each other that I decided I needed to do some reverse engineering on my
> BRPE before I tried to connect anything to it.
>
> I've put a schematic up for my machine at:
> -- https://homepage.cs.uiowa.edu/~jones/pdp8/UI-8/log2025.shtml#2025-04-17
>
> I included a drawing of the face of the Amphenol Micro Ribbon connector at
> the back of the machine giving the pinout -- and I took the time to measure
> the pulses from the electromagnetic pickup to figure out the polarity of
> the pulses (positive before negative or negative before positive),
> supposing that someone cares about that.
>
>                 Doug Jones
> ______________________________________________________________
> GreenKeys mailing list
> Home: http://mailman.qth.net/mailman/listinfo/greenkeys
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:GreenKeys at mailman.qth.net
>
> >>> Jordan Spencer Cunningham's GreenKeys Search Tool:
> https://teletype.net/gksearch
> >>> 2002-to-present greenkeys archive:
> http://mailman.qth.net/pipermail/greenkeys/
> >>> 1998-to-2001 greenkeys archive:
> http://mailman.qth.net/archive/greenkeys/greenkeys.html
> >>> Randy Guttery's 2001-to-2009 GreenKeys Search Tool:
> http://comcents.com/tty/greenkeyssearch.html
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to mooreericnyc at gmail.com
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/greenkeys/attachments/20250418/cdd2d2e4/attachment.html>