19 Nov
2019
19 Nov
'19
12:45 a.m.
Are you guys talking about “A formal description of System/360” by Falkoff, Iverson and
Sussenguth? It uses an APL like notation but not exactly a S/360 emulator in APL! Much
more concise than the S/360 POP.
http://www.cs.trinity.edu/~jhowland/class.files.cs2321.html/falkoff.pdf
On Nov 18,
2019, at 8:43 AM, Clem Cole <clemc(a)ccc.com> wrote:
On Sun, Nov 17, 2019 at 12:14 AM Dave Horsfall
<dave(a)horsfall.org> wrote:
On Sat, 16 Nov 2019, Peter Jeremy wrote:
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.
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https://minnie.tuhs.org/cgi-bin/mailman/listinfo/coff 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...