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=DKIM_SIGNED,DKIM_VALID, MAILING_LIST_MULTI,RCVD_IN_DNSWL_NONE autolearn=ham autolearn_force=no version=3.4.4 Received: (qmail 29675 invoked from network); 2 Jun 2020 00:00:13 -0000 Received: from minnie.tuhs.org (45.79.103.53) by inbox.vuxu.org with ESMTPUTF8; 2 Jun 2020 00:00:13 -0000 Received: by minnie.tuhs.org (Postfix, from userid 112) id CEBFA9CA99; Tue, 2 Jun 2020 10:00:12 +1000 (AEST) Received: from minnie.tuhs.org (localhost [127.0.0.1]) by minnie.tuhs.org (Postfix) with ESMTP id 836EF9C5F1; Tue, 2 Jun 2020 09:59:28 +1000 (AEST) Authentication-Results: minnie.tuhs.org; dkim=pass (1024-bit key; secure) header.d=mxes.net header.i=@mxes.net header.b="LavecU+k"; dkim-atps=neutral Received: by minnie.tuhs.org (Postfix, from userid 112) id 7CB2B9C5F1; Tue, 2 Jun 2020 09:59:25 +1000 (AEST) Received: from smtp-out-3.mxes.net (smtp-out-3.mxes.net [198.205.123.68]) by minnie.tuhs.org (Postfix) with ESMTPS id C6FF593D46 for ; Tue, 2 Jun 2020 09:59:24 +1000 (AEST) Received: from Customer-MUA (mua.mxes.net [10.0.0.1]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.mxes.net (Postfix) with ESMTPSA id 15E4075985; Mon, 1 Jun 2020 19:59:21 -0400 (EDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mxes.net; s=mta; t=1591055962; bh=glT4NO+WScFciaFzlqU9OBAA1wdrpSsPjjTB8KK8KtM=; h=Content-Type:Mime-Version:Subject:From:In-Reply-To:Date: Message-Id:References:To; b=LavecU+kk8ksVqtbzwT1W1vp0hzNOaCMwUBhG51WpOZFIMSkpt3tvQNSoX4tCFYC3 evL+B7/Pnc1B9lwX6OxiI3uPGq3p4hBDLcXIaYovrjHBiOQ62Axlnw7EJblBPMUFOX XjqapSyC4eHd9Dg+nqZekN/sYOpbk5sBIFENL+7s= Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 13.4 \(3608.80.23.2.2\)) From: Ronald Natalie In-Reply-To: Date: Mon, 1 Jun 2020 19:59:20 -0400 Content-Transfer-Encoding: quoted-printable Message-Id: References: To: Paul Riley X-Mailer: Apple Mail (2.3608.80.23.2.2) X-Sent-To: Subject: Re: [TUHS] DEC RL01/RL02 RX01/RX02 Disk Image Creator 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 main list Errors-To: tuhs-bounces@minnie.tuhs.org Sender: "TUHS" As far as the early UNIXs go, any disk is collection of 512-byte blocks. = The filesystems either the early (what I=E2=80=99ll call V6) and the = later (V7) don=E2=80=99t differ much. The primary difference is that the later V7 had 16-bit uids and a = provision for larger file systems/sizes. The V6 file system was = limited to 2^24 blocks while V7 did 2^32. The 512 block size corresponded to the native sector size of all the DEC = hardware except the RX which I think only had 128-byte sectors. But = again, we didn=E2=80=99t do much with that other than write the standalone console disks for the = 780 (in RT format) and I also used it to make =E2=80=9Cunix=E2=80=9D = file system disks for the BRL =E2=80=9CLOS=E2=80=9D (little operating system=E2=80=A6no time for sharing, uniprocessor = system) that ran our internet routers and the IO hardware on the HEP = supercomputer.