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_ADSP_CUSTOM_MED, DKIM_INVALID,DKIM_SIGNED,FREEMAIL_FROM,MAILING_LIST_MULTI autolearn=unavailable autolearn_force=no version=3.4.4 Received: (qmail 28330 invoked from network); 2 Jan 2023 18:50:33 -0000 Received: from minnie.tuhs.org (50.116.15.146) by inbox.vuxu.org with ESMTPUTF8; 2 Jan 2023 18:50:33 -0000 Received: from minnie.tuhs.org (localhost [IPv6:::1]) by minnie.tuhs.org (Postfix) with ESMTP id 8502942498; Tue, 3 Jan 2023 04:50:01 +1000 (AEST) Received: from mail-lf1-f42.google.com (mail-lf1-f42.google.com [209.85.167.42]) by minnie.tuhs.org (Postfix) with ESMTPS id E247D42471 for ; Tue, 3 Jan 2023 04:49:57 +1000 (AEST) Received: by mail-lf1-f42.google.com with SMTP id p36so42634306lfa.12 for ; Mon, 02 Jan 2023 10:49:57 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:from:to:cc:subject:date :message-id:reply-to; bh=u3u/jTITyE2KVDHzegRaaRQWtCUJATSZow4EUbwrteo=; b=An0fF+4zGsSNKqM4etOM24g/7bP2Mtk6zzzWhOjYs8WPuz1ugj70UlJX25AkDo4Uys pKR8O8I6QCHQu//eiF+5bDh69KaG7iffXc3IwtwpXZK/smBM99MvWqIHA0EgMaMHUs2F VvnxYcHCGNM/6V6RwNVDEyzty0jildj3EXHI1wvC4U55tLzLhzp18eFITmn7C0/Vktz+ 3AxrWuI0srLq7sg3Xm8yCNxjFkh6g4MNk9Up/vkrbIZw/aXZXewM18JhKRC63gXE+nZ7 Ndf55hko+fz53AOFre+pSj9yJ+56ZzKG4zPL108DonDpqK6yVvgl6ncLD/HoTpCeIySH 4msw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding: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=u3u/jTITyE2KVDHzegRaaRQWtCUJATSZow4EUbwrteo=; b=cGNUDJzMOC5Lfxld/v590YH+JepBEFKI474xZFxiBK9f7TqKpAtCFnT1pJh97xsS4z +CajZgkNzRUeWsPFrTDolUPSRKEKTdKZXBlLBBzbbK0PAHNARBMH2WCJzUBA88F8f517 0doOnrAR4Y8N1+RIPRALZxn6338r60hXhYc9xVCjd5gn2b2XxIWpgH7L79wlvdAtqhzs atSpNz/7OYyT0fQt/Lc/oKvEfVREwlClRGa9aoHdstb59lzPd1NivqDWO0wLIoLN28L1 zcuNyGeb/qUzrrbBHd4pbYYth7kfWH7IrVdCKAVdlATrzZgWpaH/XjQ7iCA/Bgcmb/vT eKsQ== X-Gm-Message-State: AFqh2kogFiLgBiIQz2ejAOwiS1cxIKRGCzTwgxHBf3kucQVm4Yc/11dj n6ArT0TdMd3wf0CIQs8LNPThj9un5tUDxtxzxmg= X-Google-Smtp-Source: AMrXdXu3xJKarvk7drQot/tzfniS+8bA/x/oDQvUIl3mAOis1vRMK6juEV9KA066M4/ASVZPZ+X2o2qz/ng+vFxEmBI= X-Received: by 2002:a05:6512:23a6:b0:4cb:bec:27e6 with SMTP id c38-20020a05651223a600b004cb0bec27e6mr1607553lfv.86.1672685336247; Mon, 02 Jan 2023 10:48:56 -0800 (PST) MIME-Version: 1.0 References: <52FB6638-AEFF-4A4F-8C2E-32089D577BA0@planet.nl> <464819f0-d2f6-2a60-6481-a194f4428b4d@case.edu> <20221230200246.GW5825@mcvoy.com> <88f83b4c-b3f9-ed87-b2fa-560fb369742a@makerlisp.com> <20221231035931.GG5825@mcvoy.com> <528f0c53-ccc2-88a1-5a7b-120362c648dd@mhorton.net> <20230102165120.GK25547@mcvoy.com> <20230102174304.GM25547@mcvoy.com> In-Reply-To: From: Dan Cross Date: Mon, 2 Jan 2023 13:48:19 -0500 Message-ID: To: Clem Cole Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Message-ID-Hash: RFNIJWHVBLMWTSSANYI7LF4VNVQ7LEAA X-Message-ID-Hash: RFNIJWHVBLMWTSSANYI7LF4VNVQ7LEAA X-MailFrom: crossd@gmail.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: COFF X-Mailman-Version: 3.3.6b1 Precedence: list Subject: [COFF] Re: [TUHS] Re: A few comments on porting the Bourne shell List-Id: Computer Old Farts Forum Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: [Apologies for resending; I messed up and used the old Minnie address for COFF in the Cc] On Mon, Jan 2, 2023 at 1:36 PM Dan Cross wrote: > > On Mon, Jan 2, 2023 at 1:13 PM Clem Cole wrote: > > Maybe this should go to COFF but Adam I fear you are falling into a tap= that is easy to fall into - old =3D=3D unused > > > > One of my favorite stores in the computer restoration community is from= 5-10 years ago and the LCM+L in Seatle was restoring their CDC-6000 that t= hey got From Purdue. Core memory is difficult to get, so they made a card= and physical module that could plug into their system that is both electri= cally and mechanically equivalent using modern semiconductors. A few week= s later they announced that they had the system running and had built this = module. They got approached by the USAF asking if they could get a copy of = the design. Seems, there was still a least one CDC-6600 running a particul= ar critical application somewhere. > > > > This is similar to the PDP-11s and Vaxen that are supposed to be still = in the hydroelectric grid [a few years ago the was an ad for an RSX and VMS= programmer to go to Canada running in the Boston newspapers - I know someo= ne that did a small amount of consulting on that one]. > > One of my favorite stories along these lines is the train signalling > system in Melbourne, running on a "PDP-11". I quote PDP-11 because > that is now virtualized: > https://www.equicon.de/images/Virtualisierung/LegacyTrainControlSystemSta= bilization.pdf > > Indeed older systems show up in surprising places. I was once on the > bridge of a US Naval vessel in the late '00s and saw a SPARCstaton 20 > running Solaris (with the CDE login screen). I don't recall what it > was doing, but it was a tad surprising. > > I do worry about legacy systems in critical situations, but then, I've > been in a firefight when the damned tactical computer with the satcomm > link rebooted and we didn't have VHF comms with the battlespace owner. > That was not particularly fun. > > - Dan C.