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Int 21 Fn 4404 - Dubldisk.sys V2.6 - Get Info [d]
AX = 4404h
BL = drive number of DoubleDisk drive (00h = default, 01h = A:, etc.)
CX = number of bytes (000Ah-0014h, call ignored otherwise)
DS:DX -> data record (see below)
Return: CF clear if successful
AX = number of bytes read
CF set on error
AX = error code (01h,05h,06h,0Dh) (see AH=59h)
Program: DUBLDISK.SYS is the device driver portion of DoubleDisk, a disk
expander by Vertisoft Systems, Inc.
Note: the installation check consists of scanning memory for the signature
"FAT 2.6 byte:", which is immediately followed by a data table
See Also: AX=440Dh
Index: installation check;DUBLDISK.SYS
Format of data record:
Offset Size Description
00h WORD (call) signature 4444h
02h BYTE (call) function
00h ???
01h ???
---function 00h---
02h BYTE (return) ???
03h BYTE (return) ???
---function 01h---
02h WORD (return) 4444h
04h WORD allocation unit size???
06h WORD ???
08h WORD ???
0Ah BYTE ???
Format of signature data table:
Offset Size Description
00h 5 BYTEs ???
05h BYTE first drive number
06h BYTE number of drives
07h ???
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