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 5061 invoked from network); 27 Nov 2021 15:57:18 -0000 Received: from minnie.tuhs.org (45.79.103.53) by inbox.vuxu.org with ESMTPUTF8; 27 Nov 2021 15:57:18 -0000 Received: by minnie.tuhs.org (Postfix, from userid 112) id F1EE89CEB1; Sun, 28 Nov 2021 01:57:14 +1000 (AEST) Received: from minnie.tuhs.org (localhost [127.0.0.1]) by minnie.tuhs.org (Postfix) with ESMTP id C52FD9CE5D; Sun, 28 Nov 2021 01:57:05 +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="Y124My+l"; dkim-atps=neutral Received: by minnie.tuhs.org (Postfix, from userid 112) id 9BF389CE65; Sun, 28 Nov 2021 01:53:37 +1000 (AEST) Received: from mail-ua1-f47.google.com (mail-ua1-f47.google.com [209.85.222.47]) by minnie.tuhs.org (Postfix) with ESMTPS id 0DCD994942 for ; Sun, 28 Nov 2021 01:53:37 +1000 (AEST) Received: by mail-ua1-f47.google.com with SMTP id a14so24736924uak.0 for ; Sat, 27 Nov 2021 07:53:37 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=mime-version:from:date:message-id:subject:to:cc; bh=9dyTHMl48+b/4zyeUvJJY6tflLdqtTmxAM5WwAT6Csk=; b=Y124My+lafOw4MojdGMJ7NXE3bqKQP288DhmlPMXPN+kWsTQpXjdolzVRcznQqIPPD /MAySc2kgiIDmwZ23qCO6JevvTS9WZe75I9VVi5iyugnAkv1u2NbyBzeWZVC7sdw63xK gh9//8EnWjY01nXebLgUFLzOK46rGHJgvdOgYERqhEPrCUgSDLz+d/T3+FO/AxLwOCQE ulptw1Tp+F/GzbwVwC4FPHFruQu4i54XOqc7IsYBIPxVdPfQE1zOdyiDagonG0GGGhh8 T3Au/ov+s7Ib4m34PZdDcf0WsriM9cDJ0RkknKjNJ9ur8o6GLqQ06z8d0KQeNek0nKNi XfyQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:from:date:message-id:subject:to:cc; bh=9dyTHMl48+b/4zyeUvJJY6tflLdqtTmxAM5WwAT6Csk=; b=45wQJqiZZZ83exeQoPl8sPhypMo8fXP+D0v4eLXd7Kdau69dyK4f4Q/GyEkUayl4OW JjLrCrODlVXw2i3FjA9ncm1GFQcFzjFb1+mpii23IvEgJln/DenibgRd2Si7/WWJw+c3 +6UzcnZDjyFqeyfsCso+G8iwty56//kc0a/ofdsqzT1ostiJA4tRPuYUUWIwZRMmMVUd oAY2rbodSGRi1iRKsyvaOPUf7Rc/Z3/rsLqY9R+zA3Jw5pOJXTNygkhsbK+T8CbQOSlT tKnKT25EQI4rQmJ5FSPtQnVBpFu0aE12d+oA9kcecajKJcsDbVaMgr7tyajJ3MAH7Yq0 I2BA== X-Gm-Message-State: AOAM533dKlNWiDPvvdXIFiwN3RqOwEeg2DRrk5ZpvimKICh0JujIa8jn BchYxRsFiWH/9OekbyCTMH81Nm0zcVXlWlF/aI67A9rR6DM= X-Google-Smtp-Source: ABdhPJy2xvw/AuXaZOlydAQX2eosC6jPShrqYiovPFSakvS4WHDwkGljp7w2zQOVIqsNDHG56Knd6AKyD+LqeMOcvrU= X-Received: by 2002:ab0:2498:: with SMTP id i24mr41930989uan.18.1638028416050; Sat, 27 Nov 2021 07:53:36 -0800 (PST) MIME-Version: 1.0 Received: by 2002:ab0:71d0:0:0:0:0:0 with HTTP; Sat, 27 Nov 2021 07:53:35 -0800 (PST) From: Paul Winalski Date: Sat, 27 Nov 2021 10:53:35 -0500 Message-ID: To: Noel Chiappa Content-Type: text/plain; charset="UTF-8" Subject: Re: [TUHS] 9-track tape (was PL/I stuff) 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@minnie.tuhs.org Errors-To: tuhs-bounces@minnie.tuhs.org Sender: "TUHS" DEC's VAX/VMS group got a customer bug report that was accompanied by a 9-track tape containing the programs and data necessary to reproduce the problem. When the engineer mounted the tape, it contained completely different data. He tried a different tape drive and this time he got the expected data. It turned out that the customer had reused the tape and recorded the reproducer at 1600 bpi on top of previous data recorded at 800 bpi. If the tape was mounted such that the drive didn't see the PE burst, it could still read the NRZI-encoded 800 bpi data. -Paul W.