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, RCVD_IN_DNSWL_NONE autolearn=ham autolearn_force=no version=3.4.4 Received: (qmail 28324 invoked from network); 18 Feb 2021 18:08:51 -0000 Received: from minnie.tuhs.org (45.79.103.53) by inbox.vuxu.org with ESMTPUTF8; 18 Feb 2021 18:08:51 -0000 Received: by minnie.tuhs.org (Postfix, from userid 112) id 6587E9C793; Fri, 19 Feb 2021 04:08:47 +1000 (AEST) Received: from minnie.tuhs.org (localhost [127.0.0.1]) by minnie.tuhs.org (Postfix) with ESMTP id 6798C9C6D8; Fri, 19 Feb 2021 04:08:12 +1000 (AEST) Received: by minnie.tuhs.org (Postfix, from userid 112) id D8A1A9C6D8; Fri, 19 Feb 2021 04:08:08 +1000 (AEST) Received: from anduin.eldar.org (anduin.eldar.org [24.106.248.90]) by minnie.tuhs.org (Postfix) with ESMTPS id 20E979C6D6 for ; Fri, 19 Feb 2021 04:08:06 +1000 (AEST) Received: from anduin.eldar.org (IDENT:brad@localhost [127.0.0.1]) by anduin.eldar.org (8.15.2/8.13.8) with ESMTPS id 11II7vp6007282 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Thu, 18 Feb 2021 13:07:57 -0500 (EST) Received: (from brad@localhost) by anduin.eldar.org (8.15.2/8.13.8/Submit) id 11II7tiW015365; Thu, 18 Feb 2021 13:07:55 -0500 (EST) From: Brad Spencer To: arnold@skeeve.com In-Reply-To: <202102180759.11I7xdVc007366@freefriends.org> (arnold@skeeve.com) Date: Thu, 18 Feb 2021 13:07:55 -0500 Message-ID: MIME-Version: 1.0 Content-Type: text/plain X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.4.3 (anduin.eldar.org [127.0.0.1]); Thu, 18 Feb 2021 13:07:58 -0500 (EST) Subject: Re: [TUHS] AT&T 3B1 - Emulation available 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@tuhs.org Errors-To: tuhs-bounces@minnie.tuhs.org Sender: "TUHS" arnold@skeeve.com writes: > Ed Carp wrote: > >> Wasn't the 3B1 the same thing as the 7300? > > There were differences in the amounts of memory and size of disk. The 3B1 > had room for a larger disk and thus its case was shaped differently. > In terms of other hardware and the software, they were the same. > > Arnold Hmm.. think I used one of those 7300, aka Unix PC systems when I was an undergrad a long time ago. It looked like images I find on the Net in any case, but it was a long time ago. Whatever it was that we had, I remember that the floppy drive was 5.25 inch and used 512 byte sectors. I had a Radio Shack Color Computer 3 at the time and the disk controller on that would read a 512 double density byte sector disk just fine. I had gotten pretty good at reading foreign disks on the CC3 and I put a copy of /bin/sh onto the floppy on the Unix PC and then used the CC3 to adjust the ownership and mode to make the copy of the sh binary setuid root. Since the Unix PC would allow anyone to mount the floppy (at least on the one we had) and since they didn't restrict setuid for the mounted floppy I ended up with a root shell. Fun times... used it for some class work instead of the PDP11/44 running BSD that we also had at the university. -- Brad Spencer - brad@anduin.eldar.org - KC8VKS - http://anduin.eldar.org