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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

???