* ESP
@ 1996-12-09 0:00 Ken Garlington
1996-12-14 0:00 ` ESP Richard Riehle
` (2 more replies)
0 siblings, 3 replies; 7+ messages in thread
From: Ken Garlington @ 1996-12-09 0:00 UTC (permalink / raw)
Just got the December issue of Embedded Systems Programming. The
feature article this month is a Richard Riehle article on Ada.
I liked the article very much, but I have to ask:
* Who's this PL/I programmer discussed in the article?
* Did there _have_ to be a statement on how Ada was inappropriate
for 8-bit controllers? That pretty much killed any desire on
my part to try to build one.
* Why can "Ada" be spelled correctly everywhere but on the front
cover, where it's spelled "ADA"?
It's not there now, but eventually the article should be at
http://www.embedded.com, where back issues of ESP are kept.
--
LMTAS - The Fighter Enterprise - "Our Brand Means Quality"
See http://www.lmtas.com for more information (job listings now
available)
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: ESP
1996-12-09 0:00 ESP Ken Garlington
@ 1996-12-14 0:00 ` Richard Riehle
1996-12-15 0:00 ` ESP Larry Kilgallen
1996-12-15 0:00 ` ESP Eric Miller
1996-12-17 0:00 ` ESP Ken Garlington
1996-12-17 0:00 ` ESP Robert I. Eachus
2 siblings, 2 replies; 7+ messages in thread
From: Richard Riehle @ 1996-12-14 0:00 UTC (permalink / raw)
To: Ken Garlington
Since I am the culprit who wrote the article, I suppose it is my
responsibility to respond.
On Mon, 9 Dec 1996, Ken Garlington wrote:
> Just got the December issue of Embedded Systems Programming. The
> feature article this month is a Richard Riehle article on Ada.
> I liked the article very much, but I have to ask:
Glad you enjoye most of the article, Ken. I have been getting pretty
good email from readers, including non-DoD readers who are interested
in looking in to Ada.
> * Who's this PL/I programmer discussed in the article?
You may recall that there was a contibutor to the thread on the
Ariane incident who kept insisting that everything would have been
just fine if the software had been programmed in PL/I instead of
Ada. And in those PL/I posts that contibutor made recurring
references to audit trails and printed reports. As you and I know,
embedded space systems rarely have any attached printers.
> * Did there _have_ to be a statement on how Ada was inappropriate
> for 8-bit controllers? That pretty much killed any desire on
> my part to try to build one.
I specifically mentioned the 8051 8-bit microcontroller. My comments
should not be construed to mean that no eight-bit microcontroller
is appropriate for Ada. And I hope to be proven wrong by my belief
that the 8051 is inappropriate for Ada. If I am wrong, it will be
more to my delight than to my dismay.
When I first agreed to do the article, I also agreed to indicate where
I thought Ada was unsuited as a language as well as well as where it
was well-suited. The article is weighted far more heavily on the
virtues of Ada than on its liabilities. I hope this one small
paragraph does not suggest abrogation of the use of Ada in those many
applications where it is undeniably the best choice.
I welcome Ada enthusiasts to prove me wrong on the 8051, and will
publish an article on the Ada 8051 compiler as soon as it is ready.
> * Why can "Ada" be spelled correctly everywhere but on the front
> cover, where it's spelled "ADA"?
Sigh. I too was somewhat disappointed at the way it appeared on the
cover. I wrote the text and approved the typset version of the
article. The cover was designed by an artist. Artists like to
see the symmetry of their work. If ESP accepts another article for
next year's Tri-Ada issue, I will remind them of the spelling format
customarily used for Ada.
> It's not there now, but eventually the article should be at
> http://www.embedded.com, where back issues of ESP are kept.
Yes, I believe it will be added eventually.
Thanks for your comments, Ken. I do try to write these articles so
they will be informative and useful. Sometimes I fall short of my
own expectations -- disappoint myself -- but I am trying to do my
part to enlighten the not-yet-Ada-aware software community regarding
some of Ada's benefits.
Richard Riehle
richard@adaworks.com
AdaWorks Software Engineering
2555 Park Boulevard
Suite 30
Palo Alto, CA 94306
(415) 328-1815
FAX 328-1112
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: ESP
1996-12-14 0:00 ` ESP Richard Riehle
1996-12-15 0:00 ` ESP Larry Kilgallen
@ 1996-12-15 0:00 ` Eric Miller
1 sibling, 0 replies; 7+ messages in thread
From: Eric Miller @ 1996-12-15 0:00 UTC (permalink / raw)
Richard Riehle wrote:
> > It's not there now, but eventually the article should be at
> > http://www.embedded.com, where back issues of ESP are kept.
>
> Yes, I believe it will be added eventually.
It's there: <http://www.embedded.com/feat1296.htm>
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: ESP
1996-12-14 0:00 ` ESP Richard Riehle
@ 1996-12-15 0:00 ` Larry Kilgallen
1996-12-17 0:00 ` ESP Andrew Lynch
1996-12-15 0:00 ` ESP Eric Miller
1 sibling, 1 reply; 7+ messages in thread
From: Larry Kilgallen @ 1996-12-15 0:00 UTC (permalink / raw)
In article <Pine.GSO.3.95.961214131401.15507A-100000@nunic.nu.edu>, Richard Riehle <rriehle@nunic.nu.edu> writes:
> You may recall that there was a contibutor to the thread on the
> Ariane incident who kept insisting that everything would have been
> just fine if the software had been programmed in PL/I instead of
> Ada. And in those PL/I posts that contibutor made recurring
> references to audit trails and printed reports. As you and I know,
> embedded space systems rarely have any attached printers.
If someone had included a printer on the Ariane :-),
would it have been intact after the incident ?
Larry Kilgallen
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: ESP
1996-12-09 0:00 ESP Ken Garlington
1996-12-14 0:00 ` ESP Richard Riehle
1996-12-17 0:00 ` ESP Ken Garlington
@ 1996-12-17 0:00 ` Robert I. Eachus
2 siblings, 0 replies; 7+ messages in thread
From: Robert I. Eachus @ 1996-12-17 0:00 UTC (permalink / raw)
In article <1996Dec14.191445.1@eisner> kilgallen@eisner.decus.org (Larry Kilgallen) writes:
> If someone had included a printer on the Ariane :-),
> would it have been intact after the incident ?
The right question is "Would they have still sent the data down the
bus to the engine controller?"
Remember that the final nail in the coffin was that the telemetry
data was sent over the same bus as the commands to the point the
engines, and that this is what actually caused the rocket to go out of
control.
--
Robert I. Eachus
with Standard_Disclaimer;
use Standard_Disclaimer;
function Message (Text: in Clever_Ideas) return Better_Ideas is...
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: ESP
1996-12-09 0:00 ESP Ken Garlington
1996-12-14 0:00 ` ESP Richard Riehle
@ 1996-12-17 0:00 ` Ken Garlington
1996-12-17 0:00 ` ESP Robert I. Eachus
2 siblings, 0 replies; 7+ messages in thread
From: Ken Garlington @ 1996-12-17 0:00 UTC (permalink / raw)
Robert I. Eachus wrote:
>
> In article <1996Dec14.191445.1@eisner> kilgallen@eisner.decus.org (Larry Kilgallen) writes:
>
> > If someone had included a printer on the Ariane :-),
> > would it have been intact after the incident ?
>
> The right question is "Would they have still sent the data down the
> bus to the engine controller?"
>
> Remember that the final nail in the coffin was that the telemetry
> data was sent over the same bus as the commands to the point the
> engines, and that this is what actually caused the rocket to go out of
> control.
Well, sorta... if both INUs had just turned off their remote terminals,
for example, I don't know if the flight control would have had a backup
attitude source. It still might have crashed.
to maintain control.
>
> --
>
> Robert I. Eachus
>
> with Standard_Disclaimer;
> use Standard_Disclaimer;
> function Message (Text: in Clever_Ideas) return Better_Ideas is...
--
LMTAS - The Fighter Enterprise - "Our Brand Means Quality"
For job listings, other info: http://www.lmtas.com or
http://www.lmco.com
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: ESP
1996-12-15 0:00 ` ESP Larry Kilgallen
@ 1996-12-17 0:00 ` Andrew Lynch
0 siblings, 0 replies; 7+ messages in thread
From: Andrew Lynch @ 1996-12-17 0:00 UTC (permalink / raw)
Larry Kilgallen wrote:
> In article <Pine.GSO.3.95.961214131401.15507A-100000@nunic.nu.edu>, Richard Riehle <rriehle@nunic.nu.edu> writes:
> > As you and I know,
> > embedded space systems rarely have any attached printers.
>
> If someone had included a printer on the Ariane :-),
> would it have been intact after the incident ?
My mind is making up weird images of trails of fanfold paper floating
in the sky...
Andrew.
^ permalink raw reply [flat|nested] 7+ messages in thread
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1996-12-09 0:00 ESP Ken Garlington
1996-12-14 0:00 ` ESP Richard Riehle
1996-12-15 0:00 ` ESP Larry Kilgallen
1996-12-17 0:00 ` ESP Andrew Lynch
1996-12-15 0:00 ` ESP Eric Miller
1996-12-17 0:00 ` ESP Ken Garlington
1996-12-17 0:00 ` ESP Robert I. Eachus
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