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 DOS interrupt handling
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 The following DOS interrupt calls are handled transparently:

 INT 21h     Functions 00h - 6ch except:
            0Fh   Open file (fcb)
            10h   Close file (fcb)
            14h   Sequential disk file read
            15h   Sequential disk file write
            16h   Create file
            21h   Random disk record read
            22h   Random disk record write
            23h   Get file size
            24h   Set random record field
            27h   Random block read
            28h   Random block write
            31h   TSR
            44h   IOCTL functions 0ch and 0dh
            5Dh   Miscellaneous DOS internal functions
            5Eh   Microsoft Network functions 3 and above
            5Fh   Network functions 6 and above
            65h   Get country information

 INT 23h     Control C
 INT 25h     Absolute DOS Read
 INT 26h     Absolute DOS Write