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From: Ted Dennison<dennison@telepath.com>
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Subject: Re: AdaOS
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In article <3BF019F4.C9C460E5@mida.se>, Mats Karlssohn says...
>
>been led to belive that in NT the main purpose of the HAL is to isolate the
>device drivers from the architectural differenses of of different processors
>and machines. Like the difference between the separate I/O addresspace of
>the x86 vs. {alpha,mips} memory mapped I/O, the idea is that the same device
>driver can be used for a card, it doesn't matter weather the card is in
>a AlphaStation or an Intel box. There is more to it though (as usual).

The device drivers and the NT kernel both. I think they went with that design
because they were initially planning on porting NT to a great number of
platforms, and they didn't want to have to make changes all over the OS every
time that was done. However, they only ever had ports for 3 platforms, and they
soon dropped one of those.

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T.E.D.    homepage   - http://www.telepath.com/dennison/Ted/TED.html

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