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From: Paul Rubin <>
Subject: Re: is Ada used in James Webb Space Telescope software?
Date: Sun, 26 Dec 2021 16:37:00 -0800	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

John McCabe <> writes:
> I didn't realise there had been so many projects in Forth.

Much of Forth's early development was at the Kitt Peak observatory where
I think Charles Moore worked for a while, so it was popular with the
astronomy community and maybe indirectly with the spaceflight community
through there and JPL.  As a more general matter, hardware designers
(electrical engineers who sometimes have to muck with embedded software
but aren't really into programming as a topic) tend to like it because
of its simplicity and directness.

> as it looked like we (Matra Marconi Space) might be forced to use the
> RTX2010 as it was one of very few space qualified processors with
> hardware floating point support. In the end we used the MA31750, with
> Ada, instead.

Interesting.  I hadn't heard of the MA31750 but it appears to be a 16
bit processor that implements the MIL-STD-1750A instruction set(!),
which I didn't know about either.  Apparently it was made in the 1980s
but has since been superseded by SPARC architecture cpu's.

I wonder if targeting GCC to the RTX2010 might have been feasible.
Can I ask what Ada compiler you used for the MA31750?  It looks like GCC
supported the MA31750 until version 3.1, but I don't know whether GNAT
existed then.

  reply	other threads:[~2021-12-27  0:37 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-12-26 13:18 Nasser M. Abbasi
2021-12-26 14:23 ` Dmitry A. Kazakov
2021-12-26 19:22   ` Paul Rubin
2021-12-26 23:57     ` John McCabe
2021-12-27  0:37       ` Paul Rubin [this message]
2021-12-27  7:44         ` Niklas Holsti
2021-12-28 10:24         ` John McCabe
2021-12-28 10:59           ` Niklas Holsti
2021-12-31 10:26             ` John McCabe
2021-12-31 21:18               ` [OT] ESA project memories (was Re: is Ada used in James Webb Space Telescope software?) Niklas Holsti
2022-01-05 16:43                 ` John McCabe
2022-04-23  9:17         ` is Ada used in James Webb Space Telescope software? 姚飞
2021-12-30 13:30 ` Peter Chapin
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