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Int 44  - Acorn Bbc Master 512 - "osargs" - Get/set File Params For Open   [O]

   AH = nonzero file handle
       AL = function
       00h get sequential pointer for file
       01h set sequential pointer for file
       02h get length of file
   BX -> 4-byte data buffer

Return: BX buffer updated if appropriate

See Also: INT 40"Acorn",INT 41"Acorn",INT 44/AH=00h,INT 45"Acorn",INT 4A"Acorn"
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