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- Newsgroups: comp.os.ms-windows.misc
- Path: sparky!uunet!utcsri!torn!spool.mu.edu!umn.edu!csus.edu!netcom.com!samiam
- From: samiam@netcom.com (Scott Moore)
- Subject: Re: Windows NT
- Message-ID: <1992Dec27.191516.10755@netcom.com>
- Organization: Netcom - Online Communication Services (408 241-9760 guest)
- References: <3371.2B34C4CD@catpe.alt.za> <1992Dec21.154448.18823@wraxall.inmos.co.uk>
- Date: Sun, 27 Dec 1992 19:15:16 GMT
- Lines: 31
-
- des@inmos.co.uk (David Shepherd) writes:
-
- >Vassilo Walluschnig (Vassilo.Walluschnig@f55.n7101.z5.fidonet.org) wrote:
-
- >: 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.
-
- Ive run serveral applications under NT that write directly to the VGA. They
- simply are slowed down (a little), meaning that some of the accesses are
- being emulated by NT. There is nothing inherently bad about direct hardware
- acess, as long as it is controlled by the OS. This wouldn't apply to the
- RISC case, since there is no VGA to access (I'm guessing character
- mode only ?).
-
- [sam]
- --
- Scott A. Moore [SAM] | "Cash is more
- samiam@netcom.com | important than your
- Santa Cruz, CA USA | mother"
- 408-423-1624 | Allan Shugart - CEO Segate Corp.
- ------------------------------------------------------------------------
-