Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
Int 21h Function 3Fh
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     If reading from a character device (such as the standard input) in
     cooked mode, at most one line of input will be read (up to a
     carriage return character or the specified length, whichever comes
     first).
 
     If the carry flag is returned clear but AX = 0, then the file
     pointer was already at end-of-file when the program requested the
     read.
 
     If the carry flag is returned clear but AX < CX, then a partial
     record was read at end of file or there is an error.
 
     [Version 3.0+]
     If the program is running on a network, the user must have Read
     access rights to the directory and file.
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