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=-0.1 required=5.0 tests=DKIM_INVALID,DKIM_SIGNED, HTML_FONT_LOW_CONTRAST,HTML_IMAGE_ONLY_28,HTML_MESSAGE, MAILING_LIST_MULTI autolearn=ham autolearn_force=no version=3.4.4 Received: (qmail 26600 invoked from network); 3 Nov 2022 16:20:03 -0000 Received: from minnie.tuhs.org (50.116.15.146) by inbox.vuxu.org with ESMTPUTF8; 3 Nov 2022 16:20:03 -0000 Received: from minnie.tuhs.org (localhost [IPv6:::1]) by minnie.tuhs.org (Postfix) with ESMTP id 9DEA34014F; Fri, 4 Nov 2022 02:19:55 +1000 (AEST) Received: from mail-vs1-f50.google.com (mail-vs1-f50.google.com [209.85.217.50]) by minnie.tuhs.org (Postfix) with ESMTPS id 5BF8A4010E for ; Fri, 4 Nov 2022 02:19:49 +1000 (AEST) Received: by mail-vs1-f50.google.com with SMTP id n68so2218607vsc.3 for ; Thu, 03 Nov 2022 09:19:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ccc.com; s=google; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:from:to:cc:subject:date:message-id:reply-to; bh=lisUl5mjKZ39diHEi8HbOOEfXCjcos7w8CrADKgP+zg=; b=eWhrBWgkw35uEO7p8lx7hgZ6cVvecyhO/LAC4pAc7e7l4AAzWQ8pROzxr1uCjDWApw sm0sWiW72jm16q/reHXo+NocQvtrCK7HAmDyMwGGOvufv0Sv/9s5l2h+mjVkC/MIAGHZ sBoUMpDkwcjPSryHOgBZAf1IBDdgjajlE6kDE= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; 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=lisUl5mjKZ39diHEi8HbOOEfXCjcos7w8CrADKgP+zg=; b=gsSCho4kpYG6sHK/dIn0AUoi6gY1c0ghKcWfN4x+drd16CQGc4HpZRtN9tCPuuvqnl 8T2Fzxp8CpVUGxX/6ZcbWQnDFSv0OIT9AkECkLsDIMRFGzsV1xdWiW6xdAMOiGYWJyLz IQrJ6jJDpO2DjqRZHNZzDm8BCJpgWeVmW7OObBv36Tov9o2nAiozOE4tVjtcVcRH7GBG pegTK2JlDPb94gRxPiyLS+pMKodGNixbrAoT6ss2ilezos91ENN9ZpEEYjSp5Is+Yes7 lh1CUvSS3J7frA8hAdtjoym/U5zEw0uQQ65r+iE2G3I3SlrHJ8S+p66CMdGuI5M91biI ENpw== X-Gm-Message-State: ACrzQf39+9VaWFtlilWv1us7l41hPNWDmn28nb2jdUhUJVQ16gvGeHMz Ev/OFTw1+h7GJVrM0sbQIH71xwctibaArC1U6pyMfA== X-Google-Smtp-Source: AMsMyM40vjl+XxRJig69AbJyoFpp2p/c7B8QY1lXO8Ejc73x5wVYXHhdUY2OoaQHgsN4ggtqT4WUSi7EHmyAuSfUtOc= X-Received: by 2002:a67:e207:0:b0:3aa:14fb:44f1 with SMTP id g7-20020a67e207000000b003aa14fb44f1mr17070948vsa.54.1667492328275; Thu, 03 Nov 2022 09:18:48 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: Clem Cole Date: Thu, 3 Nov 2022 12:18:22 -0400 Message-ID: To: Paul Winalski Content-Type: multipart/alternative; boundary="000000000000e496ef05ec934f35" Message-ID-Hash: UZSXSW6OKNVJGFVTX3SGFDCKS7SXET4J X-Message-ID-Hash: UZSXSW6OKNVJGFVTX3SGFDCKS7SXET4J X-MailFrom: clemc@ccc.com X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; header-match-tuhs.tuhs.org-0; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header CC: steve jenkin , TUHS X-Mailman-Version: 3.3.6b1 Precedence: list Subject: [TUHS] Re: Early Unix and Keyboard Skills List-Id: The Unix Heritage Society mailing list Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: --000000000000e496ef05ec934f35 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, Nov 3, 2022 at 11:19 AM Paul Winalski wrote: > The LA36 DECwriter had a rather slow carriage return. It would buffer > characters while a return was in progress and then print the buffered > characters at 60 characters/second, slowing down to the normal 30 cps > when caught up. > The key point here is that with the DEC Writer (LA36) DEC started to split the print speed (*in cps*) from the line interface speed (*in baud* as it was larger than an often character as it would have at least one start bit, one or more stop bits, and maybe a parity bit too). Herein also lies another problem, the mechanical interface, be it how fast the carriage moved, or the head was positioned, etc, could be much longer than the single character transfer time. As Paul mentioned on some mechanical devices without any buffering, the print might be random as the carriage moved the head. Teletype made an amazing mechanical device that had a minimum amount of electronics in it. By the time of the LA36, you start to see the microprocessor revolution and the use of cheap transistors to replace mechanical things to make faster/better devices with new features (like buffering and being able to have different speeds for data transfer and printing). But you also start to see the distinction between the mechanics (the keyboard/printer) and things like the communications scheme become even more obvious and terminology starts to be used to address the specific part of the problem. =E1=90=A7 --000000000000e496ef05ec934f35 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


On Thu, Nov 3, 2022 at 11:19= AM Paul Winalski <paul.winal= ski@gmail.com> wrote:
The LA36 DECwriter had a rather slow carriage return.=C2=A0 It= would buffer
characters while a return was in progress and then print the buffered
characters at 60 characters/second, slowing down to the normal 30 cps
when caught up.=C2=A0

The key point here = is that with the DEC Writer (LA36) DEC started to split the print speed (in cps) from the line interface speed (in baud as it was larger= than an often character as it would have at least one start bit, one or mo= re stop bits, and maybe a parity bit too).=C2=A0 =C2=A0Herein=C2=A0also lie= s another problem, the mechanical=C2=A0interface, be it how fast the carria= ge moved, or the head was positioned, etc, could be much longer than the si= ngle character transfer=C2=A0time.=C2=A0 As Paul mentioned on some mechanic= al=C2=A0devices without any buffering, the print might be random as the car= riage=C2=A0moved the head.

Teletype made an amazing me= chanical device that=C2=A0had a minimum amount of electronics in it.=C2=A0 = By the time of the LA36, you start to see the microprocessor revolution and= the use of cheap transistors to replace mechanical things to make faster/b= etter devices with new features (like buffering and being able to have diff= erent speeds for data transfer and printing).=C2=A0 =C2=A0But you also star= t to see the distinction between the mechanics (the keyboard/printer) and t= hings like the communications scheme become even more obvious and terminolo= gy starts to be used to address the specific part of the problem.
3D==E1=90=A7
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