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Format of FCB reserved field for DOS 5.0

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Offset Size Description

18h

BYTE

number of system file table entry for file

19h

BYTE

attributes
bits 7, 6 :
00 = SHARE.EXE not loaded, disk file
01 = SHARE.EXE not loaded, character device
10 = SHARE.EXE loaded, remote file
11 = SHARE.EXE loaded, local file or device
bits 5 - 0 : low six bits of device attribute word

---SHARE.EXE loaded, local file---

1Ah

WORD

starting cluster of file on disk

1Ch

WORD

unique sequence number of sharing record

1Eh

BYTE

file attributes

1Fh

BYTE

unused???

---SHARE.EXE loaded, remote file---

1Ah

WORD

network handle

1Ch

DWORD

network ID

---SHARE not loaded, local device---

1Ah

DWORD

pointer to device driver header (see #01646)

1Eh

2 BYTEs

unused???

---SHARE not loaded, local file---

1Ah

BYTE

extra info
bit 7 : read-only attribute from SFT
bit 6 : archive attribute from SFT
bits 5 - 0 : high bits of sector number

1Bh

WORD

starting cluster of file

1Dh

WORD

low word of sector number containing directory entry (see #01352)

1Fh

BYTE

number of directory entry within sector