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Format of FCB reserved field for DOS 2.x
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Offset
Size
Description
18h
BYTE
bit 7
:
set if logical device
bit 6
:
set if open???
bits 5 - 0
:
???
19h
WORD
starting cluster number on disk
1Bh
WORD
???
1Dh
BYTE
???
1Eh
BYTE
???
1Fh
BYTE
???