🚀 go-pugleaf

On Fri, 6 May 2005 00:16:20 +0100, "Stephen Howe"
<sjhoweATdialDOTpipexDOTcom> wrote:

>>>Quake for DOS does not start properly
>>
>> unsurprising, xp contains no dos.
>
>Not strictly true.
>NT 3.1, NT 3.5, NT 4.0, Windows 2000, Windows XP : the 100% 32-bit versions 
>of Windows have these things called subsystems.
>The subsystems allow different types of executable to run under Windows.
>
>NT 4.0 and Windows 2000 has 5 subsystems
>Windows XP has 4 subsystems.
>
>Remember IBM?
>It produced  an operating system, which can still be bought, called OS/2.
>Originally this was 16-bit but IBM bought out a version that was 32-bit.
>And back in 1989, you could use Microsoft C 6.0 to build 16-bit OS/2 
>executables.
>And you can still produce 16-bit OS/2 executables, to this day, using 
>OpenWatcom.
>They have a completely different format to 32-bit Windows executable.
>So why am I mentioning this?
>
>Well, as an experiment, if you tried running the 16-bit OS/2 executable from 
>the command line of Windows 2000, it will run.
>An executable format that is 16 years old, effectively obsolete, still runs 
>under Windows 2000 (but not XP - Microsoft removed support for OS/2 
>subsystem in XP).
>What a surprise.
>
>Question: What are the sub-systems for 32-bit Windows?
>
>POSIX Subsystem - capable of running POSIX.1 apps
>Win32 Subsystem - runs 32-bit Windows apps
>Win16 Subsystem - runs 16-bit Windows apps (that is Windows 3.0, 3.1 native 
>apps from 1990-1994)
>DOS16 Subsystem - runs 16-bit DOS apps (and that means DOOM and Quake) in 
>Virtual DOS Machine
>OS/216 Subsystem - runs 16-bit OS/2 1.x character-mode apps
>
>If you look for the following files in Windows System directory
>
>NTIO.SYS     - The equivalent of IO.SYS on MS-DOS machines.
>NTDOS.SYS    - The equivalent of MSDOS.SYS.
>NTVDM.EXE    - Win32 Application.
>NTVDM.DLL or NTVDMD.DLL   - Win32 Application.
>REDIR.EXE    - Virtual Device Driver (VDD) redirector for the VDM.
>
>They make up the DOS subsystem.
>And if you run Doom or Quake for DOS, it will be NTVDM.EXE that shows up in 
>Task Manager.
>Now how well it runs DOS programs is another matter :-)

snippy snip

i sit corrected.

dr ratt

------------------------------------------------------------
gary: so there's no chance we can be together?
lisa: only if you promise me you'll never die.
gary: you know i can't promise that.
lisa: if you could do that, i'd make love to you, right now.
gary: i promise. i will never die.