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From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
Subject: Re: DDS and Ada
Date: Fri, 8 Jul 2011 14:31:44 -0500
Organization: Jacob Sparre Andersen Research & Innovation
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Date: 2011-07-08T14:31:44-05:00
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"Shark8" <onewingedshark@gmail.com> wrote in message 
news:ccd482d7-1693-4540-8e88-d552caa1c126@ct4g2000vbb.googlegroups.com...
>On Jul 7, 8:04 pm, Gautier write-only <gautier_niou...@hotmail.com>
>wrote:
>> On 7 juil, 04:34, Shark8 <onewingedsh...@gmail.com> wrote:
>>
>> > Though a DOS Ada 2012 compiler might be very nice for one wishing to
>> > do an OS.
>>
>> Really?
>
>DOS is so minimal/unconstrained that one can easily make bootable
>program with a DOS compiler.

Right. Our embedded packages and DOS compilers were essentially the same 
back in the day; the only thing that DOS really did for us was load the 
program into memory (and provide a file system, but of course I/O is easily 
separable). Trap handling was done directly in the hardware, tasking was 
handled solely by our RTS, and most of the memory management (before 
Extended Memory, anyway) was done by our RTS. So all that needed to be 
different was the loader code (burn to EEPROM rather than load from disk, 
and set up a few additional registers).

                                Randy.