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 6021 invoked from network); 10 Feb 2023 21:09:23 -0000 Received: from minnie.tuhs.org (2600:3c01:e000:146::1) by inbox.vuxu.org with ESMTPUTF8; 10 Feb 2023 21:09:23 -0000 Received: from minnie.tuhs.org (localhost [IPv6:::1]) by minnie.tuhs.org (Postfix) with ESMTP id 4DBD141C67; Sat, 11 Feb 2023 07:09:22 +1000 (AEST) Received: from mail-pj1-x1036.google.com (mail-pj1-x1036.google.com [IPv6:2607:f8b0:4864:20::1036]) by minnie.tuhs.org (Postfix) with ESMTPS id 3918241C64 for ; Sat, 11 Feb 2023 07:09:17 +1000 (AEST) Received: by mail-pj1-x1036.google.com with SMTP id f16-20020a17090a9b1000b0023058bbd7b2so6797332pjp.0 for ; Fri, 10 Feb 2023 13:09:17 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=cc:to:subject:message-id:date:from:references:in-reply-to :mime-version:from:to:cc:subject:date:message-id:reply-to; bh=u2nwABxf4Gwtw5ERipdjZL5nFeOV1npbe048nsDIkf0=; b=bjOjByZpcb1NOrHqi8dZ6oZcJAKcsGulOh8NrBY56XEpqgFn9ROQGM+QquaUJX6JA4 pvI0TX4eUxZB309at+zvIBOkI10X+vGtx6FsuQZegXb9f66vUSuK4wo7bZtXN8nX/fP/ C2FbdidOf0KaTTlBM59f5M3ipTkzJ1JCncyUv9VYImCBW5zKB/Plki+DVuKeBCsTj2WV O7CgZe3DFnySXkq61/VrcIpmAYh3j1AbxTALaeK9rN7N+KHLiGc+/tOeh4PWdAhA17hT jlBbR5PUYpwxAP0c+vxTQOHg2GX68ZkOVzCnjn/2q9+QjS3skdJmcIKmumxL02FsuHH3 e97w== 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:references:in-reply-to :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=u2nwABxf4Gwtw5ERipdjZL5nFeOV1npbe048nsDIkf0=; b=OK7ub2N5QyVCs7CEekFLBX4SddlU5TJCBBQkYm9oCth4sXLytoMK8YXBd8+VZRuNrs l5yb1NNB5KZ5H2im6PoLcdHiP1CmzlXOLmK9sCl7A42vfw/FZLOZHZvLQhEFkQ78J3po z5r9vwADaUgnN3DcBS/Mj4ASfp3sgWAtc2tP1NClIqFkPOVAgzG44Jh67G49MXduD6wM uqHxK7mgMwIi8/9P41FjNVTclsjagjSRXPSItdFj9Yk34s2GskUSH4fvePkKkzTHRetZ rXLQlonOeXdAvdOUMUZe/gVT1P76Hq1h5IhYL0utFruvLAmq0HVKADc96yJtjHgIAGHe Ycew== X-Gm-Message-State: AO0yUKVpVUmsjCxEivjwGY1oSOQRSS7R/cx8oU4awvSvNlL6Z4iy7l69 bbsScuVsx1e86xkW5IhXa7sLlu6n/de+6zQyUT8= X-Google-Smtp-Source: AK7set+kE9z0YDbOPSdga/MuAh38w9mVGqpUNUdGjM3O36VZNjDIyEtXUVJhJ8szpm50THvXtTPn5RfDZVQnNmCI/rw= X-Received: by 2002:a17:90a:53c5:b0:230:7f32:bf01 with SMTP id y63-20020a17090a53c500b002307f32bf01mr2989942pjh.1.1676063356678; Fri, 10 Feb 2023 13:09:16 -0800 (PST) MIME-Version: 1.0 Received: by 2002:a05:6a11:3dc7:b0:412:8124:c58f with HTTP; Fri, 10 Feb 2023 13:09:15 -0800 (PST) In-Reply-To: <98FF7DD9-2CA4-4347-85B9-5D8B99395712@iitbombay.org> References: <6f278982-4616-7fe0-ef2f-37ecd4f2ff23@gmail.com> <98FF7DD9-2CA4-4347-85B9-5D8B99395712@iitbombay.org> From: Paul Winalski Date: Fri, 10 Feb 2023 16:09:15 -0500 Message-ID: To: Bakul Shah Content-Type: text/plain; charset="UTF-8" Message-ID-Hash: PSFUX7M7TDV2MDADH2SQCCNCP6XOSZCE X-Message-ID-Hash: PSFUX7M7TDV2MDADH2SQCCNCP6XOSZCE 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: coff@tuhs.org X-Mailman-Version: 3.3.6b1 Precedence: list Subject: [COFF] Re: Music! List-Id: Computer Old Farts Forum Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: On 2/10/23, Bakul Shah wrote: > > Somewhat related: there was enough RF leakage when the Fortune motherboard > was not in the case. I could "tune into it" near a Jazz FM station. Stan Rabinowitz, longtime member of DEC's PDP-8 software group, discovered that the same could be done with the PDP-8. He wrote a program to play music on the PDP-8 that way. > That was > quite useful because the noise pattern changed depending on what the system > was doing. Back when I was in grad school my hearing was keen enough that I could hear the high-pitch noise of television set vertical retrace and acoustic burglar alarm systems. The power supply on the VAX-11/780 emitted a steady sound at about 15KHz, which I could hear. The pitch varied depending on what the system was doing. There was a particular sequence of pitch changes when the spooling system was about to start a print job. I used to astound people by pointing at the line printer a second or two before the print job started. -Paul W.