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- Path: sparky!uunet!inmos!wraxall.inmos.co.uk!frogland!des
- Newsgroups: comp.os.ms-windows.misc
- From: des@inmos.co.uk (David Shepherd)
- Subject: Re: Windows NT
- Message-ID: <1992Dec21.154448.18823@wraxall.inmos.co.uk>
- X-Newsreader: TIN [version 1.1 PL8]
- References: <3371.2B34C4CD@catpe.alt.za>
- Date: Mon, 21 Dec 92 15:44:47 GMT
- Lines: 33
-
- Vassilo Walluschnig (Vassilo.Walluschnig@f55.n7101.z5.fidonet.org) wrote:
- : Hi All,
-
- : Okay, I got a question for all those people "in the know" about
- : Windows NT. What would happen while running NT on a RISC machine, say
- : the DEC Alpha, and running a DOS application in NT, and that DOS
- : application makes a direct call to the video card? How would NT go
- : about handling such a situation? Would it hang the application
- : or would NT come back saying that it cannot run the program and
- : promptly shuts the application down?
-
- i'd expect that NT would stop the program with a memory protection
- violation. NT, like OS/2, and unlike DOS is a "real" OS where things
- like i/o are handled via system calls to drivers ... writing directly
- to a device register is not allowed.
-
- : Surely the video card on the RISC machine is not the same as those
- : on the Intel machines? Or have I missed something?
-
- no, and that's why the it is hidden behind a driver interface. in that
- way a program running on any machine sees the same interface with the
- device drivers. the device drivers are then responsible for controlling
- the devices.
-
- this is similar to the way that under windows any program has a
- standard printer driver that it can use rather than having to have
- each application come with its own printer driver.
-
- --
- --------------------------------------------------------------------------
- david shepherd: des@inmos.co.uk tel: 0454-616616 x 625
- inmos ltd, 1000 aztec west, almondsbury, bristol, bs12 4sq
- 1992: celebrate the quincentenary of columbus getting lost
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