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 434 invoked from network); 23 Nov 2020 14:00:56 -0000 Received: from minnie.tuhs.org (45.79.103.53) by inbox.vuxu.org with ESMTPUTF8; 23 Nov 2020 14:00:56 -0000 Received: by minnie.tuhs.org (Postfix, from userid 112) id 5549A9CA66; Tue, 24 Nov 2020 00:00:46 +1000 (AEST) Received: from minnie.tuhs.org (localhost [127.0.0.1]) by minnie.tuhs.org (Postfix) with ESMTP id C11759C9E7; Tue, 24 Nov 2020 00:00:04 +1000 (AEST) Received: by minnie.tuhs.org (Postfix, from userid 112) id 4219D9C9E7; Tue, 24 Nov 2020 00:00:00 +1000 (AEST) X-Greylist: delayed 1039 seconds by postgrey-1.36 at minnie.tuhs.org; Mon, 23 Nov 2020 23:59:58 AEST Received: from mercury.lcs.mit.edu (mercury.lcs.mit.edu [18.26.0.122]) by minnie.tuhs.org (Postfix) with ESMTPS id 86E299C9E4 for ; Mon, 23 Nov 2020 23:59:58 +1000 (AEST) Received: by mercury.lcs.mit.edu (Postfix, from userid 11178) id 8F52218C096; Mon, 23 Nov 2020 08:42:34 -0500 (EST) To: tuhs@tuhs.org Message-Id: <20201123134234.8F52218C096@mercury.lcs.mit.edu> Date: Mon, 23 Nov 2020 08:42:34 -0500 (EST) From: jnc@mercury.lcs.mit.edu (Noel Chiappa) Subject: Re: [TUHS] 516-TSS Documents 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: jnc@mercury.lcs.mit.edu Errors-To: tuhs-bounces@minnie.tuhs.org Sender: "TUHS" > On Mon, Nov 23, 2020 at 12:28 PM Erik E. Fair wrote: > The Honeywell DDP-516 was the computer (running specialized software > written by Bolt, Bernanek & Newman (BBN)) which was the initial model of > the ARPANET Interface Message Processors (IMP). The IMPs had a lot of custom interface hardware; sui generis serial interlocked host interfaces (so-called 1822), and also the high-speed modem interfaces. I think there was also a watchdog time, IIRC (this is all from memory, but the ARPANET papers from JCC cover it all). Noel