Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
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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documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.
Int 21h Function 44h Subfunction 00h
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     Bits 8-15 of DX correspond to the upper 8 bits of the device
     driver attribute word.
 
     Bit 5 of the device information word for a handle associated with
     a character device signifies whether MS-DOS considers that handle
     to be in binary (raw) mode or ASCII (cooked) mode. In cooked mode,
     MS-DOS filters the character stream and may take special action
     when the characters CTRL+C, CTRL+S, CTRL+P, CTRL+Z, and carriage
     return are detected. In raw mode, all characters are treated as
     data, and the exact number of characters requested is always read
     or written.
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