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=-1.1 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,MAILING_LIST_MULTI,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.4 Received: (qmail 958 invoked from network); 19 Dec 2023 13:55:02 -0000 Received: from minnie.tuhs.org (50.116.15.146) by inbox.vuxu.org with ESMTPUTF8; 19 Dec 2023 13:55:02 -0000 Received: from minnie.tuhs.org (localhost [IPv6:::1]) by minnie.tuhs.org (Postfix) with ESMTP id ACF1E43EEC; Tue, 19 Dec 2023 23:54:59 +1000 (AEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=tuhs.org; s=dkim; t=1702994099; h=from:from:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:mime-version:mime-version: content-type:content-type:in-reply-to:in-reply-to: references:references:list-id:list-help:list-owner:list-unsubscribe: list-subscribe:list-post; bh=NYnACEm/L2i29KQGo88KnUX4ygr8JCDo74bpaTaGonk=; b=Ud5Ew780ZZcZ9TOo9KuAM+Qsqdc+qlFz5gnZLVUraYNIn4s9QHTuyY9I5It2I0m5Oh3uTV iCzNEpEGt0N1FoRWumryxdXffQSVMLy8JV5qTaiY6O5wj22FSVE9KhBkzHjQchcxXTT1+A 0XjkebV9HnUoPdpCdHJR+f6Zne6M2tY= Received: from proxmox01.kjsl.com (proxmox01.kjsl.com [204.87.183.6]) by minnie.tuhs.org (Postfix) with ESMTPS id 12ABF43EEA for ; Tue, 19 Dec 2023 23:54:51 +1000 (AEST) Received: from proxmox01.kjsl.com (localhost.localdomain [127.0.0.1]) by proxmox01.kjsl.com (Proxmox) with ESMTP id 00689E5B67 for ; Tue, 19 Dec 2023 13:54:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=employees.org; h=cc:content-type:content-type:date:from:from:in-reply-to :message-id:mime-version:references:reply-to:subject:subject:to :to; s=prox2023; bh=NYnACEm/L2i29KQGo88KnUX4ygr8JCDo74bpaTaGonk=; b= OzGsPxNZDDo4i8b3xhuK0GMfUazHlAhZkDBr1U5RcBVUBxvBfvwNKozWI8rMATqf 7YE/tfeHma+DfXa2lXTWp50nXCmmlQ1Cc2Xk3WK+6VAXrCwiKQsJJvfnwqVwqQQI pk360jMD9xx5NBm9Xjq3MxSmzYG3YafnZjBsQFsBX4q97m5QT8Ea/dI2FG9lfv53 BOd38uhcCxneGRuwpQvmgatnCjJa2Yj0nhgXo6oHBtOyGO8TasUBU98Wu3JTIY5X N19U9DT0J3h3+kzOvuIIirjMrF6R4pHfkRZ3alcpWibjzpBYog09OVknJqxkfHmc NMb80ADB1RPpUrRMnUhhiQ== Received: from clarinet.employees.org (clarinet.employees.org [198.137.202.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits)) (No client certificate requested) by proxmox01.kjsl.com (Proxmox) with ESMTPS id D1C2BE361E for ; Tue, 19 Dec 2023 13:54:49 +0000 (UTC) Received: by clarinet.employees.org (Postfix, from userid 1736) id C0A214E11CCA; Tue, 19 Dec 2023 13:54:49 +0000 (UTC) Date: Tue, 19 Dec 2023 13:54:49 +0000 To: coff@tuhs.org Message-ID: References: <20231214232935.802BB18C08F@mercury.lcs.mit.edu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20231214232935.802BB18C08F@mercury.lcs.mit.edu> Message-ID-Hash: Z3EVFPG6M3EX45IW3EUB7TXZ3KWYRZ6T X-Message-ID-Hash: Z3EVFPG6M3EX45IW3EUB7TXZ3KWYRZ6T X-MailFrom: dfawcus@employees.org 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 X-Mailman-Version: 3.3.6b1 Precedence: list Subject: [COFF] Re: Terminology query - 'system process'? List-Id: Computer Old Farts Forum Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: From: Derek Fawcus via COFF Reply-To: Derek Fawcus On Thu, Dec 14, 2023 at 06:29:35PM -0500, Noel Chiappa wrote: > Interestingly, other early systems don't seem to have thought of this structuring technique. How early does that have to be? MP/M-1.0 (1979 spec) mentions this, as "Resident System Processes" http://www.bitsavers.org/pdf/digitalResearch/mpm_I/MPM_1.0_Specification_Aug79.pdf It was a banked switching, multiuser, multitasking system for a Z80/8080. It mentions 5 such processes. Later versions, and the 8086 version still had them. The MP/M-86 docs mention 'Terminal Message', Clock, Echo and 'System Status' processes. I believe the first was spawned one per console. (Some of the internal structures suggest it was intended to support swapping, but I don't know if that was implemented in terms of disk swapping) DF