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Copyright 1991 David Jurgens |
DTA - Disk Transfer Area (partially undocumented)
DTA contains data, of which the first 21 bytes (00-15h) are known
as being "reserved for DOS use on subsequent find next calls"
Offset Size Description
00 byte attribute of search (undocumented)
01 byte drive used in search (undocumented)
02 11bytes search name used (undocumented)
0D word directory entry number (0 based, DOS 3.x+, undoc.)
0F word starting cluster number of current directory
zero for root directory (DOS 3.x+, undocumented)
11 word reserved (undocumented)
13 word starting cluster number of current directory
zero for root directory (DOS 2.x+, undocumented)
15 byte attribute of matching file
16 word file time (see FILE ATTRIBUTES)
18 word file date (see FILE ATTRIBUTES)
1A word file size
1E 13bytes ASCIIZ filename and extension in the form NAME.EXT
with blanks stripped
- fields of DTA change dependent upon function call in progress
- the DTA cannot span a 64K segment boundary
- for compatibility with CP/M the default DTA is at offset 80h
in the PSP; this area is also used for the command tail. To
avoid collision, set another DTA (INT 21,1A) or preserve the
command tail before using FCB function calls
- see INT 21,4E INT 21,1A INT 21,2F
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DTA |
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