Int 21H Function 0FH
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Description: Open File
Opens a file and makes it available for subsequent read/write
operations.
Input Output
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AH=0FH If function successful (file found)
DS:DX=segment:offset AL=00
of file control and FCB filled in by MS-DOS as follows:
block drive field (offset 00H0=1 for drive A,
2 for drive B, etc.
current block field (offset 0CH)=00H
record size field (offset 0EH)=0080H
size field (offset 10H)=file size from
directory
date field (offset 14H)=date stamp from
directory
time field (offset 16H)=time stamp from
directory
If function unsuccessful (file not found)
AL=0FFH
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