From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on inbox.vuxu.org X-Spam-Level: X-Spam-Status: No, score=-0.6 required=5.0 tests=DKIM_ADSP_CUSTOM_MED, DKIM_INVALID,DKIM_SIGNED,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,HTML_MESSAGE,MAILING_LIST_MULTI, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.4 Received: from minnie.tuhs.org (minnie.tuhs.org [IPv6:2600:3c01:e000:146::1]) by inbox.vuxu.org (Postfix) with ESMTP id B99622D023 for ; Mon, 18 Mar 2024 15:58:26 +0100 (CET) Received: from minnie.tuhs.org (localhost [IPv6:::1]) by minnie.tuhs.org (Postfix) with ESMTP id E709F425CD; Tue, 19 Mar 2024 00:58:21 +1000 (AEST) Received: from mail-pj1-x1030.google.com (mail-pj1-x1030.google.com [IPv6:2607:f8b0:4864:20::1030]) by minnie.tuhs.org (Postfix) with ESMTPS id 3F2D9416EC for ; Tue, 19 Mar 2024 00:58:16 +1000 (AEST) Received: by mail-pj1-x1030.google.com with SMTP id 98e67ed59e1d1-29c5f8bc830so2988824a91.2 for ; Mon, 18 Mar 2024 07:58:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1710773895; x=1711378695; darn=tuhs.org; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:from:to:cc:subject:date:message-id:reply-to; bh=xR9u0UYttpGR91k+nsj0faYIAbWU4inNZr9luizrMOI=; b=TjI7zx5+HDBS1pTADw92jSnNbP1NMGsOjM337y1I4He2tB9fosPnRgs1/YxJJ+QSl+ EJRrYL/ntOGvhe+/9gakLYMSa9UqPnfI9/qGVKHB/b/nf4Iyt+AlcVM34f6JoMtZeOnZ E5fY0PUIN2yix8viqSAF58fXtD7jbebXDZ5g9LTum9ZDTrBZWtcODU2DVRjUBsYbdaDw aeMfqZC+QMWt3k6aa7avOEUD8kfUvbyyQZ5ZzfT7tM98T9iJD9JLYxKKmnihS3Y4q7pC 1uc5NCkrl1zDH4sRsQpQMq4LgLvZDllMUR9JFAFYhJf6cu63zJm/0Hjl78/O6fXYDpg3 UJ2A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1710773895; x=1711378695; 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=xR9u0UYttpGR91k+nsj0faYIAbWU4inNZr9luizrMOI=; b=JXjgTa2tVNwqcJcLsUZEgQHshgtmAdQGE3HH9bRL/1vWhLTQzfjmT7dGMTjuT0OlQG u/H5/qtYB3tilVQewjmSkgreUJVW32FBMTExEkxAtH5jmZOkTiv/zjsgLLykcKtGxL55 jZmGZj9bP9dxQIJwsl0dcimoODVWh+wTFbgyv9tXswnHUZK9WwRkKG9JoLhOVQxj521D De1XO9JnenRI7EUHk/56uSSnLtgZIAZhjQnf1qfS2eJfM9AhfzsHw2jmH5UrzVCGl09Z W5to87LOLezJFswF33PE5DUqS6JPA7KUjUxbkVacHhDrutE/+Zwr3P1Wwwbb/eWlVXlL eWlg== X-Forwarded-Encrypted: i=1; AJvYcCXy+Bubzj4o0vbFpD+G1U1HG03IEGJ/9+Qo8iH2rZEeORuzqXH9kB/BFLej34/advOmp/jBNJ0qs63sP9Q7 X-Gm-Message-State: AOJu0Yxj8nWoDEBEdW8lMn/wx/R6gV4UtmC7gQBqtYi886syFZnagebH DucYl8qtr64igefXHlkyeR5ENbHJefjDiRLRnwbKVGzOOUKvWDySYio7egpmNbmAs2dHpy362Ui OsK6esZHxSINFa+3PxUN5mSYUsYilf1iZ X-Google-Smtp-Source: AGHT+IGGg8Ap6VlMhgqITQ3eW3i/h5ev7WXNYDzKtrmR6t7/2VcW07jXKJfPGaZR/wrfeXWQwRzPDACbUjKs9DeBoho= X-Received: by 2002:a17:90b:3595:b0:29b:b1f3:c4ab with SMTP id mm21-20020a17090b359500b0029bb1f3c4abmr7244260pjb.46.1710773895492; Mon, 18 Mar 2024 07:58:15 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: Paul Winalski Date: Mon, 18 Mar 2024 10:58:04 -0400 Message-ID: To: Clem Cole Content-Type: multipart/alternative; boundary="0000000000005503b30613f096f0" Message-ID-Hash: BLIAV3WQC6WONNORI24DFJKJJ2HKDQ3B X-Message-ID-Hash: BLIAV3WQC6WONNORI24DFJKJJ2HKDQ3B X-MailFrom: paul.winalski@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: The Eunuchs Hysterical Society X-Mailman-Version: 3.3.6b1 Precedence: list Subject: [TUHS] Re: Of /dev/tty8 List-Id: The Unix Heritage Society mailing list Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: --0000000000005503b30613f096f0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, Mar 18, 2024 at 9:57=E2=80=AFAM Clem Cole wrote: > The DZ11 is an eight-port mux (with short pinned modem control and no DMA > - both causing issues). > I'm pretty sure that when we beta tested the VAX-11/780 in the summer of 1977 it had a DZ11. We only had a few LA36 printing terminals on it so we never saw any issues with it. Not so when I started work at DEC in 1980. The VAX-11/780 I worked on had IIRC three DZ11a supporting 24 terminals. The lack of DMA was a big issue. We had to run our VT52s no faster than 300 baud or it brought the system to its knees. -Paul W. --0000000000005503b30613f096f0 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
On Mon, Mar 18, 2024 at 9:57=E2=80=AFAM C= lem Cole <clemc@ccc.com> wrote:<= /div>
The DZ11 is an eight-port mux (with short pinned mo= dem control and no DMA - both causing issues).

<= /div>
I'm pretty sure that when we beta tested the VAX-11/780 in th= e summer of 1977 it had a DZ11.=C2=A0 We only had a few LA36 printing termi= nals on it so we never saw any issues with it.=C2=A0 Not so when I started = work at DEC in 1980.=C2=A0 The VAX-11/780 I worked on had IIRC three DZ11a = supporting 24 terminals.=C2=A0 The lack of DMA was a big issue.=C2=A0 We ha= d to run our VT52s no faster than 300 baud or it brought the system to its = knees.

-Paul W.
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