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NNTP-Posting-Date: Tue, 27 Mar 2018 01:08:44 -0500
From: Dennis Lee Bieber <wlfraed@ix.netcom.com>
Newsgroups: comp.lang.ada
Subject: Re: Ada-Oriented GUI
Date: Tue, 27 Mar 2018 02:08:43 -0400
Organization: IISS Elusive Unicorn
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Xref: reader02.eternal-september.org comp.lang.ada:51209
Date: 2018-03-27T02:08:43-04:00
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On Mon, 26 Mar 2018 17:29:06 -0500, "Randy Brukardt" <randy@rrsoftware.com>
declaimed the following:


>Calling an avionics display a "GUI" is confusing at best; there is little 
>relationship because of the strict requirements on avionics software. 
>(Something like RX would be unlikely to fly - pun intended - there can't be 
>"unexpected" anything in avionics software.)
>
	Yeah... The typical display is a dedicated processor of its own,
accepting a limited set of commands if it is a text display (the interface
to the flight management computers, say) with less capability than
/curses/, and a number of discrete function keys. The display processor
collects any inputs, and only sends to the FMC when a "commit" discrete is
pressed.

	Navigation displays would be similarly limited -- a dedicated processor
for the display, accepting a limited set of data for presentation (such as
a way-point/coordinates list).

	Health management system is the closest to something running a "GUI",
and those systems are not flight critical (if it fails, one just loses
health information meant for later analysis).


-- 
	Wulfraed                 Dennis Lee Bieber         AF6VN
	wlfraed@ix.netcom.com    HTTP://wlfraed.home.netcom.com/