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=-1.0 required=5.0 tests=MAILING_LIST_MULTI autolearn=ham autolearn_force=no version=3.4.4 Received: (qmail 12147 invoked from network); 13 Dec 2022 16:15:24 -0000 Received: from minnie.tuhs.org (50.116.15.146) by inbox.vuxu.org with ESMTPUTF8; 13 Dec 2022 16:15:24 -0000 Received: from minnie.tuhs.org (localhost [IPv6:::1]) by minnie.tuhs.org (Postfix) with ESMTP id 0ADD342410; Wed, 14 Dec 2022 02:14:48 +1000 (AEST) Received: from relay05.pair.com (relay05.pair.com [216.92.24.67]) by minnie.tuhs.org (Postfix) with ESMTPS id 296FF4240D for ; Wed, 14 Dec 2022 02:14:44 +1000 (AEST) Received: from orac.inputplus.co.uk (unknown [87.112.76.75]) by relay05.pair.com (Postfix) with ESMTP id 51D611A2821 for ; Tue, 13 Dec 2022 11:14:43 -0500 (EST) Received: from orac.inputplus.co.uk (orac.inputplus.co.uk [IPv6:::1]) by orac.inputplus.co.uk (Postfix) with ESMTP id 7A96422139 for ; Tue, 13 Dec 2022 16:14:42 +0000 (GMT) From: Ralph Corderoy To: tuhs@tuhs.org MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit In-reply-to: <29888CC6-CA23-4361-BC9C-1B8A775C8DA9@iitbombay.org> References: <29888CC6-CA23-4361-BC9C-1B8A775C8DA9@iitbombay.org> Date: Tue, 13 Dec 2022 16:14:42 +0000 Message-Id: <20221213161442.7A96422139@orac.inputplus.co.uk> Message-ID-Hash: BYNHQXS6KZ37BVU234FE75Y6LUKY2USK X-Message-ID-Hash: BYNHQXS6KZ37BVU234FE75Y6LUKY2USK X-MailFrom: ralph@inputplus.co.uk 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 X-Mailman-Version: 3.3.6b1 Precedence: list Subject: [TUHS] Re: Clever code List-Id: The Unix Heritage Society mailing list Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: Hi Bakul, > Fortune 32:16 was a 5.6Mhz machine and couldn't process 1020KB/sec > (17 sectors/track of early ST412/ST506 disks) fast enough. As Warner > said, one dealt with it by formatting the disk so that the logical > blocks N & N+1 (from the OS PoV) were physically more than 1 sector > apart. Sticking with ST506 hard drives, by the time the 8 MHz ARM2 from Acorn was reading a 56 MB Rodime, it was the drive which couldn't keep up so executables were stored compressed on disk so the CPU had something to do, uncompressing the sector's content, while it waited for the next sector to arrive. :-) -- Cheers, Ralph.