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From: "Jeff C," <nolongersafeto@userealemailsniff.com>
Newsgroups: comp.lang.ada
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 <3F859331.AD61B137@raytheon.com>
Subject: Re: Omission in the Ada Standard
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"Jerry Petrey @raytheon.com>" <"jdpetrey<NOSPAM> wrote in message
news:3F859331.AD61B137@raytheon.com...
>
>
> Keith Thompson wrote:
>
> > "Jeff C," <nolongersafeto@userealemailsniff.com> writes:
> > [...]
> > > Note again that no language I know of has the predefined ability to
> > > talk to ports as part of the language definition..
> >
> > Ada 83 had:
> >
> > package LOW_LEVEL_IO is
> >    --  declarations of the possible types for DEVICE and DATA;
> >    --  declarations of overloaded procedures for these types:
> >    procedure SEND_CONTROL    (DEVICE : device_type; DATA : in out
data_type);
> >    procedure RECEIVE_CONTROL (DEVICE : device_type; DATA : in out
data_type);
> > end;
> >
> > I don't know whether anybody actually implemented it, and it was
> > dropped in Ada 95 (it's not just obsolescent, there's no reference to
> > it at all).
> >
> > --
> > Keith Thompson (The_Other_Keith) kst@cts.com
<http://www.ghoti.net/~kst>
> >
>
> DDCI implemented Low_Level_IO for their 80x86 cross compiler.  We used it
on a
> project I just finished working on.
>
> Jerry
>

Of course the standard never said what the heck low level IO was even
supposed to do (although it
did have a flavor of x86 IO ports to some extent).. In any case, the fact
that some vendor chose to implement
port access via low_level_io is a far cry from claiming that this behaviour
was defined by the standard.