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[69.109.130.206]) by smtp.gmail.com with ESMTPSA id h193sm7712812ywc.88.2020.01.15.00.05.16 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 15 Jan 2020 00:05:16 -0800 (PST) Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable From: Earl Baugh Mime-Version: 1.0 (1.0) Date: Wed, 15 Jan 2020 03:05:16 -0500 Message-Id: References: <202001150710.00F7AsFQ1716609@darkstar.fourwinds.com> In-Reply-To: <202001150710.00F7AsFQ1716609@darkstar.fourwinds.com> To: Jon Steinhart X-Mailer: iPhone Mail (17C54) Subject: Re: [TUHS] Spacewar at Bell Labs [ really paper tape readers and tangentially related things ] X-BeenThere: tuhs@minnie.tuhs.org X-Mailman-Version: 2.1.26 Precedence: list List-Id: The Unix Heritage Society mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: TUHS@minnie.tuhs.org Errors-To: tuhs-bounces@minnie.tuhs.org Sender: "TUHS" I thought the concern was about the fragility of the tape and the concern ab= out running it thru a period reader. I was just thinking these two options w= ould be safer on the tape. That=E2=80=99s why I was suggesting them. Just t= rying to be helpful .. all to familiar with the long project list :-)=20 Earl=20 Sent from my iPhone > On Jan 15, 2020, at 2:12 AM, Jon Steinhart wrote: >=20 > =EF=BB=BFEarl Baugh writes: >> Why not build a variation of this with an Arduino? >> https://www.instructables.com/id/DIY-Paper-TapePunch-Card-Maker-and-Reade= r/. >> You could use cardboard rather than wood if it=E2=80=99s just a one time j= ob. ( or scan >> the tape into files and process digitally ?)=20 >>=20 >> Earl=20 >=20 > I thought that I said earlier that I had a paper tape reader here but don'= t > remember much about it or if it ever worked. If I didn't have a huge proj= ect > list and it wasn't ski season I could hook it up to a pi. More likely tha= t > I'll get to a computer museum sooner. >=20 > Just to keep this UNIX-related so that Warren doesn't get cranky, I believ= e > that this reader came out of some sort of experimental telephone exchange > in our group that was decommissioned. Dave Weller was very supportive of m= y > interests and somehow arranged for me to take much of it home as surplus > equipment. Kept me in 7400-series parts and Augat wire-wrap boards for a > long time. While there was no way that I could have kept the thing, I wis= h > that I had the magnetic drum memory because it was so cool from an industr= ial > art perspective. >=20 > Heinz may remember more about this than I do because he actually worked on= > this project, but our department developed what I believe was the first > all-digital telephone exchange that used digital filtering (Hal Alles and > Jim Kaiser were in the group). I think that it had a pair of PDP-11/10s > in it, and a bigger PDP-11 as a supervisory machine that ran UNIX. I have= > vague memories of Heinz and Carl poring over huge C program listings. I > also remember that there was a bug in the long-distance code where it wasn= 't > sending out the ST tone that ended up taking all of the key pulse senders i= n > the Berkeley Heights telephone exchange that provided the trunk line to ou= r > lab off line as they didn't have timeouts and needed to be manually reset.= > But hey, we were the phone company too so what could they do about it? >=20 > Oh, I think that the PDP-11/10s were used because we tried to use LSI-11s > but those turned out to be useless because of the way that DEC did the DRA= M > refresh; it wasn't interleaved, they just stopped everything every so many= > ms and refreshed everything. Non-starter for real-time systems. >=20 > And another thought, this machine may have been why Heinz wrote MERT. >=20 > I was gone before this system was completed so I have no idea how it fared= > and how many of the ideas were incorporated into production systems. Oh, > yeah, I think that it was called the SS1 for Slave Switch 1. >=20 > Jon