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Chapter 13. The MS-DOS Environment Under... > Using Special-Purpose Devices for MS...

Using Special-Purpose Devices for MS-DOS

NTVDM provides limited hardware support for MS-DOS applications. As mentioned, it intercepts and simulates interaction with LPT parallel ports, COM serial ports, the keyboard, and the video display. It provides DOS-mediated network and file access; it provides a mouse driver and fools MS-DOS programs into thinking that there is Sound Blaster–compatible hardware, if your system has any sort of sound support. But that's the end of the virtual hardware support.

If you depend on access to special-purpose hardware, either through direct control or through device drives, you are probably out of luck. If your program attempts to access any other hardware devices, NTVDM will either stop the program dead in its tracks or, at best, will prevent the hardware access from occurring.


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