From mboxrd@z Thu Jan 1 00:00:00 1970 From: clemc at ccc.com (Clem Cole) Date: Mon, 18 Nov 2019 11:42:59 -0500 Subject: [COFF] In Memoriam: Jay W. Forrester, happy birthday Gene Amdahl, and LSD In-Reply-To: References: <99f46273-e2a4-4a82-f827-8c00fb48f633@kilonet.net> <20191116072354.GA74610@server.rulingia.com> Message-ID: On Sun, Nov 17, 2019 at 12:14 AM Dave Horsfall wrote: > On Sat, 16 Nov 2019, Peter Jeremy wrote: > > > More than just the instruction set - IBM published a formal description > > of the S/360 (in APL in the IBM Systems Journal issue that announced the > > S/360). The S/360 was (I believe) the first case where a company > > announced a computer architecture (rather than an implementation) and > > implementations were expected to precisely comply with the architecture > > (no more finding undocumented instructions and side-effects and writing > > code that depended on them). This meant that clone makers could build a > > clone that accurately emulated a S/360. > > Ah, I'd forgotten about the APL documentation; thanks! Talk about giving > away the keys to the kingdom: Amdahl, Fujitsu, Hitachi... > The cat was already out and poking around with the publishing of: IBM 360 Principles of Operation, DOC A22-6821-0 . The APL version of spec just gave it more area to roam. -------------- next part -------------- An HTML attachment was scrubbed... URL: