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=ham autolearn_force=no version=3.4.4 Received: (qmail 15822 invoked from network); 3 Nov 2022 15:19:13 -0000 Received: from minnie.tuhs.org (50.116.15.146) by inbox.vuxu.org with ESMTPUTF8; 3 Nov 2022 15:19:13 -0000 Received: from minnie.tuhs.org (localhost [IPv6:::1]) by minnie.tuhs.org (Postfix) with ESMTP id 6643F4014F; Fri, 4 Nov 2022 01:18:49 +1000 (AEST) Received: from mail-io1-f54.google.com (mail-io1-f54.google.com [209.85.166.54]) by minnie.tuhs.org (Postfix) with ESMTPS id 140274010E for ; Fri, 4 Nov 2022 01:18:40 +1000 (AEST) Received: by mail-io1-f54.google.com with SMTP id p141so1586350iod.6 for ; Thu, 03 Nov 2022 08:18:40 -0700 (PDT) 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 :references:in-reply-to:mime-version:from:to:cc:subject:date :message-id:reply-to; bh=Q3TfQDYxfK//HK49kenug8aYPTG0acbX6Tj7DlDy6jQ=; b=QNVjTU4fcTmB/wEpKuOoBxR0CV8j5VuAfjkZFRnOjlR/UgAeaZ7AA0cu1Mx+IDf4At NVawJipwHiYAP9VcBhuOjHNe3EZA8lCK0A5gwBnn9J+1V8V6TRNAaiP0WPx8P0xhjjP3 biIw2i6zjTjsVjOHC7EGPHYguBLasoXu9ECtKaRRfP9E4L/pIN9ngY5ZfCOWzW9D6vSP iePGMz7e63bWG0mC16BmohH6bsmsvKBxVquw6RY0/DXeHNln8Am5ENfriDykPNfZ39sA gKQC+FA/w/8Q7A6gMoQgHlNnJMIqmSmmIfx1FPclJ9B1A884MldxKllB2nkpwfYY+W/K KCEQ== 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 :references:in-reply-to:mime-version:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=Q3TfQDYxfK//HK49kenug8aYPTG0acbX6Tj7DlDy6jQ=; b=hshynr7CkblNmWAMQG1FRM6mGj/wACyFm8rC1TuZ2AwHdGu+oMyFIiPyGB8Ltvelqa OHfEUbkrqZ0Em8ztZbn+4WWze14R3wwrGT7l2vGEjgNeIVqc97F45U5hKZKsvMOWQzHc afKuvOdk7EEHT8WpHned4iSC/87hPhm8DFZ2RhcVCnDIvbpVy37ksyoGM7aGw83pXHcd P5P6XeHd0nTejLBTtX+6bYk5EuPbBLgG7T1J83/0LUwGsW8t8B89dAAgOOy/aCFI8hfn 0uW7viwRiSklJmP4mkb5U7XvtaaegjesnG7r/UIoRljTpUBBB7WO0PZMs8yeO+Z3nuJB 9LIA== X-Gm-Message-State: ACrzQf38NPHBk8IW8N4nBDjbe3b2RDXxwg0etBTQOyLmvA9nVqbRp9EK wuhK+jZMsFpzm4fm1MX9GkXcPbkF4j84xxtZRS98tWSI X-Google-Smtp-Source: AMsMyM75upePGV4N50EOvObMBxooFXw6TKkcQOXnTL4mPvT4e7iO5BTfUv85rFT8QScMYqzhgm8lYv0U0Uf3x8WYVYo= X-Received: by 2002:a02:ca06:0:b0:375:6213:5e35 with SMTP id i6-20020a02ca06000000b0037562135e35mr13500234jak.107.1667488659395; Thu, 03 Nov 2022 08:17:39 -0700 (PDT) MIME-Version: 1.0 Received: by 2002:a05:6e02:2169:0:0:0:0 with HTTP; Thu, 3 Nov 2022 08:17:38 -0700 (PDT) In-Reply-To: References: From: Paul Winalski Date: Thu, 3 Nov 2022 11:17:38 -0400 Message-ID: To: Ronald Natalie Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Message-ID-Hash: EUEQBI5TM5U4DDPCRWRD3KMJ5K2IERVZ X-Message-ID-Hash: EUEQBI5TM5U4DDPCRWRD3KMJ5K2IERVZ X-MailFrom: paul.winalski@gmail.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: On 11/2/22, Ronald Natalie wrote: > I=E2=80=99m not sure the model 33 required a carriage return delay. At = 110 > baud it had plenty of time to move the carriage. back. > Other printers (especially faster ones) weren=E2=80=99t so lucky, but the= LA36 > decwriter had a catchup mode to print the backlog after a return. > The LA120 was boustrophedonic so returns weren=E2=80=99t as much of an is= sue. The model 33 had a very fast and powerful carriage return mechanism, good for cracking walnuts, but it took up to two character times to complete a CR. If you didn't send two non-printing characters (such as NUL), you risked having your character struck somewhere in the middle of the line. 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. There was a company that sold modified LA36 controller boards that were hacked so that the LA36 always thought it was in catch-up mode and could thus be run at double speed, provided that you inserted NUL padding after a CR. But that greatly reduced the longevity of the print mechanism. -Paul W.