INT 13H (0x13) Function 4AH (0x4A or 74) Initiate disk Emulation (Bootable CD-ROM) the Format of Bootable CD-ROM Specification Packet the Bit fields for Bootable CD-ROM boot media type

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INT 13H (0x13)

Function 4AH (0x4A or 74) --> Initiate disk Emulation (Bootable CD-ROM)

Call with: AH = 4AH
AL = 00H
DS:SI = Specification packet (see the Table in comments)

Return: If Function Successful,
Carry Flag = Clear

If Function unsuccessful,
Carry Flag = Set
AX = Status Code

Comments:

This Function is used to initiate the disk emulation. If the function is successful carry flag is clear, else carry flag is set and AX register returns status code and drive will not be in emulation mode.

The Format of Bootable CD-ROM Specification Packet has been given in the following table:

Offset

Size

Description

00H

BYTE

Size of packet in bytes (13H)

01H

BYTE

Boot media type

02H

BYTE

  Drive Number


Drive Number

Drive Description

00H

Floppy image

80H

Bootable hard disk

81H to FFH

Non bootable or no Emulation

 

03H

BYTE

CD-ROM controller number

04H

DWORD

Logical Block Address of disk image to Emulate

08H

WORD

            Device Specification

Value

Description

(IDE) Bit 0

Drive is slave instead of master

(SCSI) Bits 0 to 7

LUN (Logical Unit Number) and PUN (Physical Unit Number)

Bits 8 to 15

Bus Number

0AH

WORD

Segment of 3Kb buffer for caching CD-ROM reads

0CH

WORD

Load segment for initial boot image (if 0000H, load at segment  07C0H)

0EH

WORD

Number of 512-byte virtual sectors to load (only valid for Function 4CH of INT 13H)

10H

BYTE

Low byte of cylinder count (for Function 08H of INT 13H)

11H

BYTE

Sector count, high bits of cylinder count (for Function 08H of INT 13H)

12H

BYTE

Head count (for Function 08H of INT 13H)


The Bit fields for Bootable CD-ROM boot media type have been given in the following table:

Bit(s)

Description

3-0

       Media type


Value

Description

0000

No emulation.

0001

1.2M diskette.

0010

1.44M diskette.

0011

2.88M diskette.

0100

Hard disk (drive C:)

Other

Reserved

5-4

Reserved (0)

6

Image contains ATAPI driver

7

Image contains SCSI driver(s)


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Data Recovery with & without Programming


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Number of Pages
ISBN
Price of the Book


BPB Publications, New Delhi, India
540
81-7656-922-4
$69.00 (Including Shipping Charges, Cost of Book and Other expenses, Free Source Code CD included with the Book)





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