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=-1.1 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,MAILING_LIST_MULTI autolearn=ham autolearn_force=no version=3.4.4 Received: (qmail 7716 invoked from network); 26 Sep 2023 01:25:28 -0000 Received: from minnie.tuhs.org (2600:3c01:e000:146::1) by inbox.vuxu.org with ESMTPUTF8; 26 Sep 2023 01:25:28 -0000 Received: from minnie.tuhs.org (localhost [IPv6:::1]) by minnie.tuhs.org (Postfix) with ESMTP id 8635140295; Tue, 26 Sep 2023 11:25:17 +1000 (AEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=tuhs.org; s=dkim; t=1695691517; h=from:from:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding:list-id:list-help: list-owner:list-unsubscribe:list-subscribe:list-post; bh=ertWAodVq1GbAcJkF/YoN5mTddAecSYRc8f1BwcjWIw=; b=BvDizTOWhsQV22zt66fYiWQ+37Gfiy8miqI0QgTyM6dw5bEGLQQa4vaH5wjQ8DcRhAjKqO mhQ7htOOzDDJtwqGdUBw1kpLCTdQeJXEXqaiErI5Vm57Deipvdubj6jh5kuhiaeEw08VZa 1fPOvX0l6HXKAFjn0UOV+Ds+icekIy4= Received: from mail-4324.protonmail.ch (mail-4324.protonmail.ch [185.70.43.24]) by minnie.tuhs.org (Postfix) with ESMTPS id 31E314026A for ; Tue, 26 Sep 2023 11:25:05 +1000 (AEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=protonmail.com; s=protonmail3; t=1695691502; x=1695950702; bh=ertWAodVq1GbAcJkF/YoN5mTddAecSYRc8f1BwcjWIw=; h=Date:To:From:Subject:Message-ID:Feedback-ID:From:To:Cc:Date: Subject:Reply-To:Feedback-ID:Message-ID:BIMI-Selector; b=GkfD/0qyeB+JZEEvMFQwMAkkDLNtbvtUhl5MHlrc0nDUR9nuPvnyFTqEpyjb3OUq9 GPbRSvclU6+c3S2mSPKlFpq+FL0AwiWfvX5OxyRfJ7vqCsIa78odgTxNFBTt6n0BSH ISpjx+iSw1cRCGbhLoeMOqMc8/1+4gt79xTd1G4xSrqeZerxp+spzz1MzK7j/WCXqE POXKD2Iy3MWB3TcBDdB6BMlJDUHtUshfjhzYK7rA9JDoOWV5gp8+vnrcXShIB3BM6G mUgH5197rlKOkfSBQKKBTAUJwqZvmsDkbmqdtMJXSJ7uW2JkUqbY7J4V4CaMRZf0iD z3BoBXGWdf6Yw== Date: Tue, 26 Sep 2023 01:24:51 +0000 To: The Eunuchs Hysterical Society Message-ID: Feedback-ID: 35591162:user:proton MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Message-ID-Hash: DWYO2H2TKGPFA7DS2ONK7GX5SYUBV6RW X-Message-ID-Hash: DWYO2H2TKGPFA7DS2ONK7GX5SYUBV6RW X-MailFrom: segaloco@protonmail.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 X-Mailman-Version: 3.3.6b1 Precedence: list Subject: [TUHS] 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: From: segaloco via TUHS Reply-To: segaloco Hello, my studies lately bring me to the question: Are there any extant exa= mples of telephone switching software, built on UNIX, from the various part= s of the Bell System prior to the introduction of the 5ESS and 3B20D? My f= ocus veers earlier as some 5ESS/3B20D/DMERT technology is still in active u= se, that sleeping dragon can lie. 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-mec= hanical systems were abstracted into software. Even without surviving exam= ples, 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 te= lco lines too specific to consider a future swap-out with, say, a PDP11 run= ning arbitrary software? 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 wit= h 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 t= o take a crack at reading dialing, at least pulse, into some sort of softwa= re abstraction on a SBC that can, among other things, provide a switching s= ervice 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 even get that far = I'd call it a success. One less dependency on the mobile... - Matt G.