Message-ID: <271DBBEEA095D511B80D009027DE7D67DAC0F5@mcoexc01.mlm.maxtor.com>
From: "Dykstra, Sean" <Sean_Dykstra AT maxtor DOT com>
To: "'djgpp AT delorie DOT com'" <djgpp AT delorie DOT com>
Subject: RE: Windows NT: Writing to I/O port does nothing
Date: Tue, 4 Jun 2002 08:26:49 -0600 
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Reply-To: djgpp AT delorie DOT com

You wrote:

Does WindowsNT allow direct access to I/O ports for DOS apps (as OS/2
does for example) ?
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No, you need to write a sys driver for NT, and a WDM driver for 98/2K/XP.
Go to the Microsoft web site for developers and download the DDK's for those
operating systems.  They have been free in the past (haven't been out there
in awhile), and you will probably want to buy a book on WDM.

Windows 98 will let you pass through commands to the parallel port directly,
but it is really only there for compatibility.