Int 13/AX=E000h

XBIOS - COMMAND

AX = E000h
CX = 0
DL = drive number (80h,81h,82h,83h)
ES:BX = pointer to XBIOS Command Block (see #00297)

Return:
CF clear if successful
CX = 1234h XBIOS Signature
CF set on error

Program: XBIOS is a driver in some versions of Disk Manager that is loaded from the disk MBR, replacing the ROM BIOS disk support e.g. adding LBA mode support, and read/write multiple.

See Also: AH=F9h"SWBIOS"


Format of XBIOS Command Block:

Offset  Size    Description     (Table 00297)
00h    BYTE    function
0Eh Get XBIOS Configuration Information
Return:
Buffer points to Ontrackr_Ref_Data structure
(see #00298)
01h    BYTE    reserved (must be zero before function call)
02h    DWORD   buffer pointer - Input or output depending on opcode

See Also: #00298 - #00299

Format of Ontrackr_Ref_Data structure: Offset Size Description (Table 00298) 00h WORD Size of structure (33h) 02h BYTE VxD Chain mode

03h 12 BYTEs Drive 1:
Ontrackr_VxD_Data structure (see #00299)

0Fh 12 BYTEs Drive 2:
Ontrackr_VxD_Data structure

1Bh 12 BYTEs Drive 3:
Ontrackr_VxD_Data structure

27h 12 BYTEs Drive 4:
Ontrackr_VxD_Data structure (see #00299)

See Also: #00297 - #00299

Format of Ontrackr_VxD_Data structure: Offset Size Description (Table 00299) 00h BYTE INT 13h drive number 01h DWORD Delta skew value 05h BYTE Physical heads (Word 3 of Identify Data) 06h BYTE Physical sectors per track (Word 6 of Identify Data) 07h BYTE Multiple Block Size (Blocking factor) 08h BYTE Read/Write Multiple disable flags 00001000b drive supports r/w multiple 00000100b do not use read multiple 00000010b do not use write multiple 09h WORD Base port address (1F0/170) 0Bh BYTE Hardware interrupt channel (14/15)

See Also: #00298

Category: Disk I/O Enhancements - Int 13h - X

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