From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: tuhs-bounces@minnie.tuhs.org X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on inbox.vuxu.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=5.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,RCVD_IN_DNSWL_NONE autolearn=ham autolearn_force=no version=3.4.2 Received: from minnie.tuhs.org (minnie.tuhs.org [45.79.103.53]) by inbox.vuxu.org (OpenSMTPD) with ESMTP id 35b27636 for ; Wed, 26 Sep 2018 06:20:59 +0000 (UTC) Received: by minnie.tuhs.org (Postfix, from userid 112) id 38954A1E05; Wed, 26 Sep 2018 16:20:58 +1000 (AEST) Received: from minnie.tuhs.org (localhost [127.0.0.1]) by minnie.tuhs.org (Postfix) with ESMTP id 9083CA1DCC; Wed, 26 Sep 2018 16:20:25 +1000 (AEST) Received: by minnie.tuhs.org (Postfix, from userid 112) id 131D69E99B; Wed, 26 Sep 2018 16:20:23 +1000 (AEST) Received: from vtr.rulingia.com (vtr.rulingia.com [45.77.232.82]) by minnie.tuhs.org (Postfix) with ESMTPS id 54B449E998 for ; Wed, 26 Sep 2018 16:20:22 +1000 (AEST) Received: from server.rulingia.com (ppp59-167-167-3.static.internode.on.net [59.167.167.3]) by vtr.rulingia.com (8.15.2/8.15.2) with ESMTPS id w8Q6K5a2046936 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 26 Sep 2018 16:20:13 +1000 (AEST) (envelope-from peter@rulingia.com) X-Bogosity: Ham, spamicity=0.000000 Received: from server.rulingia.com (localhost.rulingia.com [127.0.0.1]) by server.rulingia.com (8.15.2/8.15.2) with ESMTPS id w8Q6K02g003406 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Wed, 26 Sep 2018 16:20:00 +1000 (AEST) (envelope-from peter@server.rulingia.com) Received: (from peter@localhost) by server.rulingia.com (8.15.2/8.15.2/Submit) id w8Q6K04X003405; Wed, 26 Sep 2018 16:20:00 +1000 (AEST) (envelope-from peter) Date: Wed, 26 Sep 2018 16:20:00 +1000 From: Peter Jeremy To: Arthur Krewat Message-ID: <20180926062000.GC29897@server.rulingia.com> References: <1686170E-4323-4BDF-B95C-8A6B3FFD5288@gmail.com> <20180924194647.GA29897@server.rulingia.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="zCKi3GIZzVBPywwA" Content-Disposition: inline In-Reply-To: X-PGP-Key: http://www.rulingia.com/keys/peter.pgp User-Agent: Mutt/1.10.0 (2018-05-17) Subject: Re: [TUHS] SPARC is CRAPS spelled backwards. X-BeenThere: tuhs@minnie.tuhs.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: The Unix Heritage Society mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: tuhs@minnie.tuhs.org Errors-To: tuhs-bounces@minnie.tuhs.org Sender: "TUHS" --zCKi3GIZzVBPywwA Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On 2018-Sep-24 16:45:13 -0400, Arthur Krewat wrote: >The 8086 was the first of the "x86" line, which was 16-bit, although=20 >it's I/O was more 8080-ish if I recall correctly. The 8086/8088 bus was designed to be similar to the 8085 to allow 8080/8085 peripherals to support 8086 systems. This saved Intel the effort of developing a new range of support peripherals and made it quicker for vendors to build 8086 systems because they didn't need to wait for the peripheral chips. There are still 8080 support chips - 8253, 8257, 8259 - embedded in PC Southbridge chips. >The 8088 was an 8-bit=20 >data bus, granted, but having done both 8080 and 8086+ assembler, you=20 >couldn't really tell the difference, programming-wise between the 8086=20 >and the 8088, 16-bit registers, and all. This was deliberate - the 8080 was an upgraded 8008 and Intel made the 8086 similar enough to allow automated ASM translation. It seems highly likely that the undocumented 8085 opcodes were undocumented because they weren't readily translatable to 8086. >Cutting costs, as always, IBM opted for the 8088, which allowed them to=20 >use an 8085-style I/O architecture. An 8-bit memory bus means half as many RAM chips and buffers. Keep in mind that the IBM 5150 was intentionally crippled to ensure it didn't compete wi= th IBM's low-end minis. --=20 Peter Jeremy --zCKi3GIZzVBPywwA Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQKTBAEBCgB9FiEE7rKYbDBnHnTmXCJ+FqWXoOSiCzQFAlurJRBfFIAAAAAALgAo aXNzdWVyLWZwckBub3RhdGlvbnMub3BlbnBncC5maWZ0aGhvcnNlbWFuLm5ldEVF QjI5ODZDMzA2NzFFNzRFNjVDMjI3RTE2QTU5N0EwRTRBMjBCMzQACgkQFqWXoOSi CzTcRxAAlqHvBtvtj0garAk37rgslIMGZRyiPamGAeMl4OvtzQeFdx2QI4QzbeoC levg3bnQf/dnEjSCnFjFd77/xjgvhJf+3IcHu/92apxdPxmP4Eu8SiYO/k3Mdln+ ii9JT7qteDYrEU2FbUZ0KTlL1t/7KWpo0Z4YSKYf1JSkNJLwbEGNf6k20ywopyv4 Bvd6rX+4PP56mx/CWTiodUdAlYmiQodA0EKLnPD8qsIuE92tAEiswOZ085pKBXfm u7NEgmlZQL2BjAff1br0IsrNV6ZsnwkxMZeUk75rfziiQlYnoZtuIYuIiDerUwYo C5u5pg8xaB7dxxha1xJO7fQs0TdvDiR5zf3BquiEc+pR/S3PXzKkRb0hYXKxyJtL WjDkRYau9OCpzW+jyiGVUr9W1B0Qq3sZLsPjxSvAa66vvi9k8i/QPppQ2Kg5G78K MMPAykck2ynwfmpPgGT+3aUBfsmAy+Sseg6rUrZMJkClfiYz1e6g7O5jC2+zRGoi uq2U6ccSY+lyGi1LJmpbYLeQgLydwMAZDWHbIp/1vc/XALFO+DwndYeFxNAHNXVO a10jSprz14FHh88dPuuXqmjynWI7YHVw/oHUadyCsAK0MW5jOBwJt7IseEU4XNgI C7QnObrsY2avDizX2oFSJsbke5uG1MbiCSQpLkhodONCqLaP/TY= =s+jv -----END PGP SIGNATURE----- --zCKi3GIZzVBPywwA--