Int 21H Function 23H
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Description: Get File Size
Searches for a matching file in the current directory; if one is found,
updates the FCB with the file's size in terms of number of records.
Input Output
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AH=23H If function successful (matching file
DS:DX=segment:offset found)
of unopened file AL=00
control block and FCB relative-record field (offset
21H) set to the number of records in
the file, rounded up if necessary to
the next complete record
If function unsuccessful (no matching
file found)
AL=FFH
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