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Format of Stacker v2+ device driver

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Offset Size Description

00h

DWORD

pointer to next driver, offset=FFFFh if last driver
FFFFh:FFFFh for Stacker Anywhere

04h

WORD

device attributes (see #01647,#01648)

06h

WORD

device strategy entry point

08h

WORD

device interrupt entry point

0Ah

BYTE

number of subunits (drives) supported by driver
0 for Stacker Anywhere

0Bh

7 BYTEs

signature "STAC-CD" for Stacker and Stacker Anywhere

12h

7 BYTEs

???

19h

BYTE

always = 01h ?? (Stacker Anywhere points here)

1Ah

WORD

signature A55Ah (all other Stacker versions point here)

1Ch

WORD

Stacker version * 64h
0C8h = 200
012Ch = 300
0190h = 400 (also Stacker Anywhere)

1Eh

WORD

offset of volume-specific information offset table (list of WORDs, one per drive, containing offsets to various information)

20h

56 BYTEs

n/a

58h

BYTE

volume number, set after INT 21/AX=4404h, INT 21/AX=4408h (use to index into volume-specific info offset table, should be set to FFh before and tested for change after)

59h

19 BYTEs

n/a

6Ch

4 BYTEs

ASCII string "SWAP"

70h

26 BYTEs

drive mapping table (one byte for each drive A: through Z:) (only used for drives swapped by SSWAP.COM; other drives compressed by Stacker can be found with the standard device driver header signature (see INT 21/AH=52h)

---Stacker 4, Stacker Anywhere---

8Ah

40 BYTEs

???

B2h

4 BYTEs

ASCII string "SWP2"

B6h

26 BYTEs

drive table ???

D0h

150 BYTEs

???

166h

60 BYTEs

LZSINFO structure (see #02808 at INT 2F/AX=4A12h)

See Also:

#02551,#01646 at INT 21/AH=52h