Function 16h Create A Disk File (FCB)
Search and open or create directory entry for file
entry AH 16h
DS:DX pointer to an Struct -FCB
return AL 00h successful creation
0FFh no room in directory
note 1) If a matching directory entry is found, the file is truncated to zero
2) If there is no matching filename, a filename is created.
3) This function calls function 0Fh (Open File) after creating or
truncating a file.
4) A hidden file can be created by using an extended FCB with the attribute
byte (offset FCB-1) set to 2.
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