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Format of DOS 2.x system file tables

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Offset Size Description

00h

DWORD

pointer to next file table (offset FFFFh if last)

04h

WORD

number of files in this table

06h

28h BYTEs

per file
Offset Size Description

00h

BYTE

number of file handles referring to this file

01h

BYTE

file open mode (see #01402 at AH=3Dh)

02h

BYTE

file attribute

03h

BYTE

drive
0 - character device
1 - A
2 - B
etc.

04h

11 BYTEs

filename in FCB format (no path, no period, blank-padded)

0Fh

WORD

???

11h

WORD

???

13h

DWORD

file size???

17h

WORD

file date in packed format (see #01666 at AX=5700h)

19h

WORD

file time in packed format (see #01665 at AX=5700h)

1Bh

BYTE

device attribute (see #01423 at AX=4400h)

---character device---

1Ch

DWORD

pointer to device driver

---block device---

1Ch

WORD

starting cluster of file

1Eh

WORD

relative cluster in file of last cluster accessed

------

20h

WORD

absolute cluster number of current cluster

22h

WORD

???

24h

DWORD

current file position???

See Also:

#01640,#01641,#01642