Int 25/AX=CDCDh

Stacker - GET DEVICE DRIVER ADDRESS

AX = CDCDh
DS:BX -> buffer for address (see #02549)
CX = 0001h
DX = 0000h

Return:
AX = CDCDh if Stacker installed
DS:BX buffer filled

Note: Not supported by Stacker Anywhere; to obtain the Stacker device driver address and to detect drives controlled by all versions of Stacker, INT 21/AX=4404h"Stacker" or lookup via the CDS and DPB should be preferred (see INT 21/AH=52h). Stacker Anywhere does not link its built-in device driver into the standard device driver chain, but it can be found via CDS/DPB

See Also: INT 21/AX=4404h"Stacker"

Format of Stacker v2+ driver address buffer: Offset Size Description (Table 02549) 00h WORD signature CDCDh 02h WORD ??? 0001h 04h DWORD pointer to Stacker signature at device driver offset 1Ah (see #02550)

Format of Stacker v2+ device driver: Offset Size Description (Table 02550) 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

Format of Stacker boot record: Offset Size Description (Table 02551) 1F0h 8 BYTEs Stacker signature (first byte is CDh) 1F8h DWORD pointer to start of Stacker device driver 1FCh WORD Stacker volume number 1FEh WORD ???

See Also: #02550

Category: File/Disk Compression - Int 25h - S

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