From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on inbox.vuxu.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=5.0 tests=DKIM_INVALID,DKIM_SIGNED, HTML_MESSAGE,MAILING_LIST_MULTI autolearn=ham autolearn_force=no version=3.4.4 Received: (qmail 10074 invoked from network); 26 Sep 2023 02:21:16 -0000 Received: from minnie.tuhs.org (2600:3c01:e000:146::1) by inbox.vuxu.org with ESMTPUTF8; 26 Sep 2023 02:21:16 -0000 Received: from minnie.tuhs.org (localhost [IPv6:::1]) by minnie.tuhs.org (Postfix) with ESMTP id A87584094C; Tue, 26 Sep 2023 12:21:11 +1000 (AEST) Received: from mail-pl1-x62e.google.com (mail-pl1-x62e.google.com [IPv6:2607:f8b0:4864:20::62e]) by minnie.tuhs.org (Postfix) with ESMTPS id DED4440920 for ; Tue, 26 Sep 2023 12:21:06 +1000 (AEST) Received: by mail-pl1-x62e.google.com with SMTP id d9443c01a7336-1c3cbfa40d6so68364685ad.1 for ; Mon, 25 Sep 2023 19:21:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kev009.com; s=google; t=1695694866; x=1696299666; darn=tuhs.org; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:from:to:cc:subject:date:message-id:reply-to; bh=XuFk8Adpp9VRNVNX2tpTrLwuAlQhqMNdKu+SU25lsTg=; b=PqEbp8PNwXepazoUz5Xr6XnlWujObYAOI2UsFOUKSmz5GZ9zbiYtjldWhavdYj8arD E3/rKeetPqxZq3KyAHQFEyf8EiFacG6dB2lmm1U3YZzbFDUp3w1dB84x6gN1LKcf2b1Q WWUi7bS+d09CwAsd5B8T+eUDPJtWs+fjlIBMY= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1695694866; x=1696299666; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=XuFk8Adpp9VRNVNX2tpTrLwuAlQhqMNdKu+SU25lsTg=; b=eLvq6cbiWOEX+OY4glVT3ErKxsso9B6Wia8rgPaHd9gEZ5dXrJnLVQrKfzJ3nnX2p/ TGF1xi49G3SvzV3amf8w0VfZElaRT0upD6ivB488D3vRssBju77/30OMw/Ti5qjtKrLF oP+PldYHNg9Y+HSp1UbcWVwH3p41u/zfRtzAGK6hlfEL1HphvHwYGjhyFrWnedx9WknA NevcME+i2+nLa7lo8m+khGhA6HtzTQQ/ZsI8bLOQMF/nRE20ADbbOyyLBQVJgZfuqlyw CKfg2UQu9n2TB3OjFyH7fTmISC/kA0ROU9NhL9MGPaTAUVItLmzgQf/2+kO+Mx7GvAU5 XzIA== X-Gm-Message-State: AOJu0Yw3qzSVRlqbODrRGHLI2x/6bO08k80CakaXJxkbC6/La7bIa2gu iCqo181GES8nnlghhNTlRjcwjq7a32NCGx1Euz93fQ== X-Google-Smtp-Source: AGHT+IF5ASGpQDAxCO/M+JA7cl97OOMU0F63uENKQC4tXPuQmERU7094c3p2iesroqFcgyWQvf6DlFcgmw3E0vTrYQY= X-Received: by 2002:a17:90a:e551:b0:262:f449:4497 with SMTP id ei17-20020a17090ae55100b00262f4494497mr7870571pjb.2.1695694865900; Mon, 25 Sep 2023 19:21:05 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: Kevin Bowling Date: Mon, 25 Sep 2023 19:20:54 -0700 Message-ID: To: segaloco Content-Type: multipart/alternative; boundary="0000000000002136bb060639bae5" Message-ID-Hash: 5CQIB3JKYXNQVENFGCIZDSLLFZQ4OW35 X-Message-ID-Hash: 5CQIB3JKYXNQVENFGCIZDSLLFZQ4OW35 X-MailFrom: kevin.bowling@kev009.com X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header CC: The Eunuchs Hysterical Society X-Mailman-Version: 3.3.6b1 Precedence: list Subject: [TUHS] Re: Known Specimens of Pre-5ESS UNIX Telephone Switching Software? List-Id: The Unix Heritage Society mailing list Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: --0000000000002136bb060639bae5 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, Sep 25, 2023 at 6:25=E2=80=AFPM segaloco via TUHS w= rote: > Hello, my studies lately bring me to the question: Are there any extant > examples of telephone switching software, built on UNIX, from the various > parts of the Bell System prior to the introduction of the 5ESS and 3B20D? > My focus veers earlier as some 5ESS/3B20D/DMERT technology is still in > active use, that sleeping dragon can lie. > Your best bet may be to contact Sarah Autumn at the Connections Museum, they have a 1ESS and 3ESS. http://www.telcomhistory.org/connections-museum-seattle-exhibits/electronic= -switching/ I don't remember if they have the 1A variant but they should have the BSPs for all of this which would give you a lot of what you are after. > What's gotten me curious is reading about 1ESS in a BSTJ volume I picked > up, noting the particulars on how previous concerns of manual and > electro-mechanical systems were abstracted into software. Even without > surviving examples, were previous systems such as the 1ESS central contro= l > ever ported to or considered for porting to UNIX, or was the hardware > interface to the telco lines too specific to consider a future swap-out > with, say, a PDP11 running arbitrary software? Columbus's SCCS (switchin= g, > not source code) also comes to mind, although all I know that survives of > that is the CB-UNIX 2.3 manual descriptions of bits and pieces. > > By the way, it's funny, I have UNIX to thank for my current experiments > with telephones and other signalling stuff, what with making me study the > Bell System more generally. It's starting to come full circle in that I > want to take a crack at reading dialing, at least pulse, into some sort o= f > software abstraction on a SBC that can, among other things, provide a > switching service on top of a UNIX-like kernel. I don't know what I'd do > with such a thing other than assign work conference call rooms their own > phone numbers to dial with a telephone on a serial line...but if I can ev= en > get that far I'd call it a success. One less dependency on the mobile... > > - Matt G. > --0000000000002136bb060639bae5 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


On Mon, = Sep 25, 2023 at 6:25=E2=80=AFPM segaloco via TUHS <tuhs@tuhs.org> wrote:
Hello, my studies lately bring m= e to the question: Are there any extant examples of telephone switching sof= tware, built on UNIX, from the various parts of the Bell System prior to th= e introduction of the 5ESS and 3B20D?=C2=A0 My focus veers earlier as some = 5ESS/3B20D/DMERT technology is still in active use, that sleeping dragon ca= n lie.

Your best bet may be to contact = Sarah Autumn at the Connections Museum, they have a 1ESS and 3ESS.

I do= n't remember if they have the 1A variant but they should have the BSPs = for all of this which would give you a lot of what you are after.
=
=C2=A0
=C2=A0
What's gotten me curious is reading about 1ESS in a BSTJ volume I picke= d up, noting the particulars on how previous concerns of manual and electro= -mechanical systems were abstracted into software.=C2=A0 Even without survi= ving examples, were previous systems such as the 1ESS central control ever = ported to or considered for porting to UNIX, or was the hardware interface = to the telco lines too specific to consider a future swap-out with, say, a = PDP11 running arbitrary software?=C2=A0 Columbus's SCCS (switching, not= source code) also comes to mind, although all I know that survives of that= is the CB-UNIX 2.3 manual descriptions of bits and pieces.

By the way, it's funny, I have UNIX to thank for my current experiments= with telephones and other signalling stuff, what with making me study the = Bell System more generally.=C2=A0 It's starting to come full circle in = that I want to take a crack at reading dialing, at least pulse, into some s= ort of software abstraction on a SBC that can, among other things, provide = a switching service on top of a UNIX-like kernel.=C2=A0 I don't know wh= at I'd do with such a thing other than assign work conference call room= s their own phone numbers to dial with a telephone on a serial line...but i= f I can even get that far I'd call it a success.=C2=A0 One less depende= ncy on the mobile...

- Matt G.
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