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> Windows > IOPL under XP for DOS applications. |
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Grom PE 06 Jan 2009, 22:01
edfed wrote: otherwise, is it possible to replace all references to serial port by a WIN32 service in a DOS under XP? Yes, using VDD calls I think. There also was a driver that allowed port I/O in WinNT family, I don't remember the name. |
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06 Jan 2009, 22:01 |
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madmatt 07 Jan 2009, 07:02
Here's a program that may help:
Quote: The WinIo library allows 32-bit Windows applications to directly access I/O ports and physical memory. It bypasses Windows protection mechanisms by using a combination of a kernel-mode device driver and several low-level programming techniques. Here's a link: http://www.internals.com/utilities_main.htm |
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07 Jan 2009, 07:02 |
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farrier 07 Jan 2009, 08:51
Or,
You can use standard Win32/64 API's to open, configure, write to, and read from both serial ports and parallel ports. Using CreateFile to "open" the port and ReadFile and WriteFile for input/output. See: http://msdn.microsoft.com/en-us/library/ms810467.aspx hth, farrier _________________ Some Assembly Required It's a good day to code! U.S.Constitution; Bill of Rights; Amendment 1: ... the right of the people peaceably to assemble, ... The code is dark, and full of errors! |
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07 Jan 2009, 08:51 |
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DJ Mauretto 07 Jan 2009, 11:29
The best way is use a driver or Windows API for that,anyway i have posted some code to modify IOPL under XP professional with user privilege ( RING 3) and let you use ALL I/O ,but i have removed the code because it's not safe
 _________________ Nil Volentibus Arduum  |
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07 Jan 2009, 11:29 |
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Japheth 07 Jan 2009, 18:55
edfed wrote: hello, i am guessing how to modify the IOPL for DOS otherwise, is it possible to replace all references to serial port by a WIN32 service in a DOS under XP? There is a Win32 API supplied by NTVDM - VDDInstallIOHook() - which allows to catch any accesses to specific ports. It's supposed to be used by VDDs, which are Win32 dlls. So the answer to your question is yes - theoretically. In practice the ports of the legacy serial/parallel devices are already hooked when your VDD is loaded. To see if a port is hooked just use DEBUG.COM. If -I <port> returns anything different than FF, then there is some emulation installed already. |
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07 Jan 2009, 18:55 |
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