From: Simon Wright <simon@pushface.org>
Subject: Re: Fun with History: “Why wasn't Ada83 object oriented?”
Date: Thu, 23 Feb 2012 18:20:38 +0000
Date: 2012-02-23T18:20:38+00:00 [thread overview]
Message-ID: <m2wr7djts9.fsf@pushface.org> (raw)
In-Reply-To: op.v9447jepule2fv@douda-yannick
"Yannick Duchêne (Hibou57)" <yannick_duchene@yahoo.fr> writes:
> By the way, I do too believe if one want to implement in C or
> assembly, that's indeed profitable to first design in Ada (if really
> Ada is not an option at implementation stage for some weird
> reasons). But then the design have to be checked, so I guess it is
> compiled in some way, so why not use the compiled product instead?
> Due to a not available platform? What platform then? Or else there
> may be other reasons, then could you tell more about these reasons?
The target processor was a Ferranti F2420[1], a 3-address word-addressed
24-bit-word machine (with an assembler looking strikingly like the
notation used by Ada to discuss the Analytical Engine[2]).
The requirement was to produce a Mascot[3] kernel, a light-weight RTS.
I used Ada to make sure the design was internally consistent, but there
was a point at which I had to say 'at this point a miracle happens'[4],
ie switching between one activity (thread, task) and another. The
compiler was an early Telelogic compiler, I think, and host/target was
VAX.
[1] http://en.wikipedia.org/wiki/Ferranti#Computers - end of section
[2] http://www.fourmilab.ch/babbage/sketch.html - eg Note C
[3]
http://en.wikipedia.org/wiki/Modular_Approach_to_Software_Construction_Operation_and_Test
[4] http://www.flickr.com/photos/skepticalist/4372728626/
next prev parent reply other threads:[~2012-02-23 18:20 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-17 17:22 Fun with History: “Why wasn't Ada83 object oriented?” Yannick Duchêne (Hibou57)
2012-02-17 17:31 ` Yannick Duchêne (Hibou57)
2012-02-17 17:33 ` Fun with History: ³Why wasn't Ada83 object oriented?² Bill Findlay
2012-02-23 13:29 ` Fun with History: “Why wasn't Ada83 object oriented?” Marco
2012-02-23 16:23 ` Simon Wright
2012-02-23 16:53 ` Yannick Duchêne (Hibou57)
2012-02-23 18:20 ` Simon Wright [this message]
2012-02-23 20:32 ` Phil Clayton
2012-02-24 1:14 ` Peter C. Chapin
2012-02-24 21:32 ` Re=Fun_with_History why_wasnt_Ada83_object_oriented tmoran
2012-02-26 14:53 ` Marco
2012-02-26 18:02 ` J-P. Rosen
[not found] ` <u-adnbL5aqVVy9fSnZ2dnUVZ_jednZ2d@earthlink.com>
2012-02-26 18:28 ` Yannick Duchêne (Hibou57)
2012-02-26 21:45 ` Jeffrey Carter
2012-02-27 17:37 ` Adam Beneschan
2012-02-27 20:27 ` Jeffrey Carter
2012-02-26 18:33 ` tmoran
2012-02-26 16:22 ` Marco
2012-03-06 1:48 ` Randy Brukardt
2012-03-07 10:33 ` Early availability of cheap Ada compilers (Was: Re=Fun_with_History why_wasnt_Ada83_object_oriented) Jacob Sparre Andersen
2012-03-07 12:43 ` Simon Clubley
2012-03-08 1:42 ` Randy Brukardt
2012-03-08 1:38 ` Randy Brukardt
2012-03-08 12:21 ` Simon Clubley
2012-03-09 2:20 ` Randy Brukardt
2012-03-08 9:00 ` anon
2012-03-08 15:32 ` Shark8
[not found] ` <5d2664b3-566a-40a5-910b-ef3460a5f363@do4g2000vbb.googlegroups.com>
2012-02-26 22:03 ` Re=Fun_with_History why_wasnt_Ada83_object_oriented J-P. Rosen
2012-02-27 1:29 ` tmoran
2012-02-26 22:06 ` Gautier write-only
2012-02-27 2:15 ` anon
2012-02-27 4:05 ` Yannick Duchêne (Hibou57)
2012-02-27 8:41 ` Dmitry A. Kazakov
2012-03-06 1:40 ` Randy Brukardt
replies disabled
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox