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INT 40 - Acorn BBC Master 512 - "OSFIND" - OPEN FILE
        AL = operation
            00h close file
            40h open file for reading
            80h open file for writing
            C0h open file for random access
        DS:BX -> CR-terminated filename
Return: AL = file handle (00h if file closed or could not be opened)
Note:   the Acorn BBC Master 512 is an 80186-based add-on board for the
          6502-based Master 128 which uses the original CPU as an I/O processor
SeeAlso: INT 42"Acorn",INT 43"Acorn",INT 44"Acorn",INT 4C"Acorn"

See Also: 41
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