Important Notice

The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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     If register Dh does not contain 00h, control returns to the
     program with the carry flag set and error code 0001h (invalid
     function) in register AX.
 
     Bit 5 of the information word for a handle associated with a
     character device signifies whether MS-DOS considers that handle to
     be in ASCII (cooked) or binary (raw) mode. See IOCTL Subfunction
     00h for more information.
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