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=-0.8 required=5.0 tests=DKIM_ADSP_CUSTOM_MED, DKIM_INVALID,DKIM_SIGNED,FREEMAIL_FROM,MAILING_LIST_MULTI, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.4 Received: (qmail 15703 invoked from network); 27 Jul 2023 20:34:04 -0000 Received: from minnie.tuhs.org (50.116.15.146) by inbox.vuxu.org with ESMTPUTF8; 27 Jul 2023 20:34:04 -0000 Received: from minnie.tuhs.org (localhost [IPv6:::1]) by minnie.tuhs.org (Postfix) with ESMTP id 5379A40D1E; Fri, 28 Jul 2023 06:34:02 +1000 (AEST) Received: from mail-il1-x133.google.com (mail-il1-x133.google.com [IPv6:2607:f8b0:4864:20::133]) by minnie.tuhs.org (Postfix) with ESMTPS id 6D11540BEA for ; Fri, 28 Jul 2023 06:33:56 +1000 (AEST) Received: by mail-il1-x133.google.com with SMTP id e9e14a558f8ab-3487d75e4c5so5813315ab.0 for ; Thu, 27 Jul 2023 13:33:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1690490035; x=1691094835; h=cc:to:subject:message-id:date:from:references:in-reply-to :mime-version:from:to:cc:subject:date:message-id:reply-to; bh=3CZ7JAkQqlBXgMig3UO9KwgGdV0Mte1UJiFRnp55euE=; b=egeJ2Z3OJ4uQ3vYS2QuZmZSOi9rUEUt8NBGJLqaKQSbXvlnzdvvKF3AaD+T+Z5uKS8 Zx8AdUiU7EfhULAyHEiOOqbcLW96jvz1bPnTzx6c7QVIoOX6fAUw1RUYMykATrzPtUFL vKY7fmTx7cqg66TJ1tnvboLX1ZLVjnfdjOugzuHPbx4P9GSsG+BHZPzXHkVSLvMkfWGU 2croVsQv6Lh5Dyqg7sDQ/yx9pr4a486x7ZG+MegvpNnIW5ruhBTUPCb4krUYL6wb9g9f D3KL9yDIEMUccU0rrq3+6E+joqjL63AvOWg6Kr+XX/wBG23AETWfuDxG+3bSFwG4YFAL 6/6w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1690490035; x=1691094835; h=cc:to:subject:message-id:date:from:references:in-reply-to :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=3CZ7JAkQqlBXgMig3UO9KwgGdV0Mte1UJiFRnp55euE=; b=P3rguCsX765u7G1gljhpft7iY3F5lCSds2qOe8SvH4Aslms1sdTCH/+EXHoxw5aD0m bGpaRj3gj5ITNGZOEobJnCW6U0fcEW1mOLnAmZaDHWev3iMJYYH13OY7FvUTTYszH9XF y4GLP6heevC73VTLwYL0vmc2cx68zJfpm5n7C4EXAhYlyNGQ/LwShmDhuLHqnrReCA3J 0ZgGv632CgDAQvUI9lEZa6W3n+exhwE++EZRLNzIlCtR4DthiOrsLqBIJ1U3QargPtsw qm4hXiz/FJLhHQxruARegDWpOoWxtSkGVVlm97VEfGor4erbQBT/RBXe3kUQAVUjXcG5 W5Vw== X-Gm-Message-State: ABy/qLbT6hr8qJvgJ3+1gzMoPSs6BCI/BDMfBqzYfxJmtywG9U1VdDOA dwJ08k5sQAcAd9NjnRw5zolNRPB/R4Sde5HwcZRGeKnJ X-Google-Smtp-Source: APBJJlFozecwII84peV3ii+ed+cYZgy7tPYojp+HvYYstvw3Jw3ZADw7zAtQV9o3t54Ek/IozNyTXL+7r9p9r6n9tVk= X-Received: by 2002:a05:6e02:1c07:b0:348:1a1d:79a5 with SMTP id l7-20020a056e021c0700b003481a1d79a5mr607560ilh.15.1690490035319; Thu, 27 Jul 2023 13:33:55 -0700 (PDT) MIME-Version: 1.0 Received: by 2002:a05:6a11:af19:b0:4c1:7ec0:eb04 with HTTP; Thu, 27 Jul 2023 13:33:54 -0700 (PDT) In-Reply-To: <20230727191643.AE34718C079@mercury.lcs.mit.edu> References: <20230727191643.AE34718C079@mercury.lcs.mit.edu> From: Paul Winalski Date: Thu, 27 Jul 2023 16:33:54 -0400 Message-ID: To: Noel Chiappa Content-Type: text/plain; charset="UTF-8" Message-ID-Hash: WTWNBTVVIYM5ROBFDPKHANVKEGEWXOFR X-Message-ID-Hash: WTWNBTVVIYM5ROBFDPKHANVKEGEWXOFR X-MailFrom: paul.winalski@gmail.com 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 CC: coff@tuhs.org X-Mailman-Version: 3.3.6b1 Precedence: list Subject: [COFF] Re: What Happened to Interdata? List-Id: Computer Old Farts Forum Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: On 7/27/23, Noel Chiappa wrote: > > Someone who's familiar with the 360 instruction set should be able to look > at e.g.: > > and see how compatible it is. Thanks for the pointer. I took a quick look. My knowledge of the S/360 instruction set is very rusty at this point--it's been over 40 years since I programmed in it. The program status word (PSW) format looks very familiar. Both architectures seem to support 24-bit addressing. Interdata has some data types and instructions for manipulating them not present in S/360. Circular lists, for example, and instructions for CRC calculation. I didn't see anything about packed or zoned decimal support. So perhaps an extended subset of S/360. I'd have to do a side-by-side comparison between this document and S/360 Principles of Operation to determine the level of binary program compatibility, if any. But it looks like it might be better than the HitchHiker's Guide to the Galaxy adage: "almost, but not quite, entirely unlike tea." -Paul W