INT 13 - Bootable CD-ROM - INITIATE DISK EMULATION AH = 4Ah AL = 00h DS:SI -> specification packet (see #00281) Return: CF clear if successful CF set on error (drive will not be in emulation mode) AX = return codes SeeAlso: AH=48h,AX=4B00h,AH=4Ch,AH=4Dh Format of Bootable CD-ROM Specification Packet: Offset Size Description (Table 00281) 00h BYTE size of packet in bytes (13h) 01h BYTE boot media type (see #00282) 02h BYTE drive number 00h floppy image 80h bootable hard disk 81h-FFh nonbootable or no emulation 03h BYTE CD-ROM controller number 04h DWORDDoubleword; four bytes. Commonly used to hold a 32-bit segment:offset or selector:offset address. Logical Block Address of disk image to emulate 08h WORD device specification (see also #00282) (IDE(Integrated Drive Electronics) A type of disk drive interface which essentially extends the PCIBM PC's expansion bus all the way to the drive and places the drive controller on the disk drive itself. See also ESDI.) bit 0: drive is slave instead of master (SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer. A host adapter connects the SCSI bus to the computer's own bus. See also ESDI, IDE.) bits 7-0: LUN and PUN bits 15-8: bus number 0Ah WORD segment of 3K 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 AH=4Ch) 10h BYTE low byte of cylinder count (for INT 13/AH=08h) 11h BYTE sector count, high bits of cylinder count (for INT 13/AH=08h) 12h BYTE head count (for INT 13/AH=08h) SeeAlso: #00283,AH=08h Bitfields for Bootable CD-ROM boot media type: Bit(s) Description (Table 00282) 3-0 media type 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(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer. A host adapter connects the SCSI bus to the computer's own bus. See also ESDI, IDE. driver(s) SeeAlso: #00281