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documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.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 Notes for IOCTL Subfunction 00H.
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