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,HTML_MESSAGE,MAILING_LIST_MULTI, RCVD_IN_DNSWL_NONE autolearn=ham autolearn_force=no version=3.4.4 Received: (qmail 23790 invoked from network); 30 Mar 2021 15:01:53 -0000 Received: from minnie.tuhs.org (45.79.103.53) by inbox.vuxu.org with ESMTPUTF8; 30 Mar 2021 15:01:53 -0000 Received: by minnie.tuhs.org (Postfix, from userid 112) id C999F9C83D; Wed, 31 Mar 2021 01:01:45 +1000 (AEST) Received: from minnie.tuhs.org (localhost [127.0.0.1]) by minnie.tuhs.org (Postfix) with ESMTP id BCCC69C82B; Wed, 31 Mar 2021 01:01:07 +1000 (AEST) Authentication-Results: minnie.tuhs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.b="uddHOaa5"; dkim-atps=neutral Received: by minnie.tuhs.org (Postfix, from userid 112) id 104629C82B; Wed, 31 Mar 2021 01:01:05 +1000 (AEST) Received: from mail-pg1-f175.google.com (mail-pg1-f175.google.com [209.85.215.175]) by minnie.tuhs.org (Postfix) with ESMTPS id D7E249C829 for ; Wed, 31 Mar 2021 01:01:03 +1000 (AEST) Received: by mail-pg1-f175.google.com with SMTP id m7so11903828pgj.8 for ; Tue, 30 Mar 2021 08:01:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=29hC8i7ZjkUQ6zP8aCPt+UJC7lzbfk9UCWsVAEizqR0=; b=uddHOaa5h+i4ZCPq0At0rcbUWw3MooNJuOlHOdg/aj4UGzBEDFHmsTTQXer7YiZxHR RHJdk4NiUd8LCEtFmoxSJwDWYGGlZIjlCpnIFsXFIi1nqZwDlp5/pN/uGaBAop2IKgP3 +HeDqZnPqSYaNE2gfbxm+9pvwhuStGUN95RzGWZJQQgQtAbDL3NMZ2L/i/dBszT6yLCI dfXNV6aE1EMIWmSoP9cChkVLKqGcgR0gd8fJwB+wTkG/kLJmitL3HlhdVbZ/CZcT90ew /fye51JjRoAGJ96K8KTssykaYoIhPxzBsGGccfgrtqfGFQyYuHPHaGYFZEjdMbK2ehVd mJFw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=29hC8i7ZjkUQ6zP8aCPt+UJC7lzbfk9UCWsVAEizqR0=; b=SAn0To0vm9W+wvGgSm3NhDG2c3zs0Yh31bBQ5kt37otJWOR/MJdiCAvU5OCBekZlh+ aVL6DRBQTE+xpMy9BNPOLRPb0yDU4tHt9k7Po5zyjhkWh1RozDVUjFOn/rWaQJzB97x6 ufZ0olgsUcu1B2fAbZAcPWmCQqrqgLVPD9sSxFdLB7AASn2oSY2pp9mzPe2NwGZ0mLeA 3UZsAPsSrLTxYe1IU71mu9a/DorQ9Zir5qnOXe3cFfVtP56S14FwAtWWJeztAdsx0gmg 3ex8mznjDIyLt3ZSDXhaJ2dNb7EwE8Q++ebIxjst6fB2TOkx9n70aAbaHJbbWJNZpfIU mW6g== X-Gm-Message-State: AOAM5323Z/Kv3Os+e7vj91a0UdD5j7NvbRhl0g6tWJrlbCNZBrr0QJum C9ofI7X2kT2VFL/dRIezdXpuSKWD4NeaYlElrzk= X-Google-Smtp-Source: ABdhPJy4G19sMymcOTIAMNXDkNqLcxbRXrqP5eE2WFRUEQFVOeM3jH9zk2jaToo15PtXt+oL+2Spd5H8KR7jbhMIi5I= X-Received: by 2002:a63:d43:: with SMTP id 3mr5980557pgn.5.1617116463250; Tue, 30 Mar 2021 08:01:03 -0700 (PDT) MIME-Version: 1.0 References: <4B1F03CA-6387-4FE1-8116-0CB7B5175DE7@ucsc.edu> <20210329205559.GI4209@mcvoy.com> <20718.1617052215@cesium.clock.org> In-Reply-To: <20718.1617052215@cesium.clock.org> From: Kenneth Goodwin Date: Tue, 30 Mar 2021 11:00:53 -0400 Message-ID: To: "Erik E. Fair" Content-Type: multipart/alternative; boundary="0000000000005a405905bec2442b" Subject: Re: [TUHS] Remember the ed thread? 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 main list Errors-To: tuhs-bounces@minnie.tuhs.org Sender: "TUHS" --0000000000005a405905bec2442b Content-Type: text/plain; charset="UTF-8" As I recall, the Dataproducts band printers BP1000, BP2000 only had a single hammer per column. But the band containing the full character set moved so quickly into position for each column that the print speed was incredible. We had both models at one point and the 2000 was an absolute screamer. Paper just flew over the paper guides to the collection basket in the rear. It was impressive and incredible to watch in action. The bands were easily replaceable via a release lever. So you could change fonts, replace damaged bands, etc. Sharp as heck as I recall on the edges. You also had to make sure it lined up just right before engaging the tension lever. With cover down, they were remarkably quiet in comparison to other "high speed" printers I had been around. Real good at multipart forms at making clean clear impressions on the backmost layer. On Mon, Mar 29, 2021, 5:16 PM Erik E. Fair wrote: > Technically, the DEC DECwriter series were dot-matrix printers, not line > printers. They differed from their Teletype predecessors only in print-head > technology, but both printed a single character at a time. Daisywheel > printers were similar. > > Line printers are distinguished not by the width of the paper but by the > printer having enough print heads to print an entire line of output at a > time. That speed advantage made them the preferred output device for > many-page program listings, as opposed to a teleprinter terminals which > were more suitable for interactive computing. > > There were dot-matrix line printers of the late 1970s made by Printronix, > which is apparently still around. > > Erik Fair > --0000000000005a405905bec2442b Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
As I recall, the Dataproducts band printers BP1000, BP200= 0 only had a single hammer per column. But the band containing the full cha= racter set moved so quickly into position for each column that the print sp= eed was incredible. We had both models at one point and the 2000 was an abs= olute screamer.
Paper just flew over the paper guides to t= he collection basket in the rear.

It was impressive and incredible to watch in action.=C2=A0

The bands were easily replaceabl= e via a release lever.=C2=A0 So you could change fonts,=C2=A0 replace damag= ed bands, etc.=C2=A0
Sharp as heck as I recall on th= e edges.
You also had to make sure it lined up just = right before engaging the tension lever.

<= div dir=3D"auto">With cover down, they were remarkably quiet in comparison = to other "high speed" printers I had been around. Real good at mu= ltipart forms at making clean clear impressions on the backmost layer.

On Mon, Mar 29, 2021, 5:16 PM Erik E. Fair <fair-tuhs@netbsd.org> wrote:
Technically, the DEC DECwriter series were dot-matrix p= rinters, not line printers. They differed from their Teletype predecessors = only in print-head technology, but both printed a single character at a tim= e. Daisywheel printers were similar.

Line printers are distinguished not by the width of the paper but by the pr= inter having enough print heads to print an entire line of output at a time= . That speed advantage made them the preferred output device for many-page = program listings, as opposed to a teleprinter terminals which were more sui= table for interactive computing.

There were dot-matrix line printers of the late 1970s made by Printronix, w= hich is apparently still around.

=C2=A0 =C2=A0 =C2=A0 =C2=A0 Erik Fair
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