INT 13H (0x13) Function 5503H (0x5503) Set DTQ (Device Type Qualifier) 5504H (0x5504) Return Identification 5505H (0x5505) Park Heads 5506H (0x5506) SCSI Bus Parity (Seagate ST01/ST02)

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INT 13H (0x13)

Function 5502H (0x5502) --> Reserved (Seagate ST01/ST02)

INT 13H (0x13)

Function 5503H (0x5503) --> Set DTQ (Device Type Qualifier) (Seagate ST01/ST02)

Call with: AX = 5503H
DH = DTQ byte (See the table in
comments)
DL = Drive Number

Return: Nothing

Comments:

This function is used to set the DTQ (Device Type Qualifier). The Function returns nothing. The Bit fields for DTQ byte have been shown in the following table:

Bit(s)

Description

0

Seagate installation software present

1

Selected drive has been installed

2

Host Adapter checks parity on the selected drive

3

Selected drive is ST225N

4

Selected drive is paired ST225N/NP

5

Reserved

6

SCSI drive attached

7

Reserved

INT 13H (0x13)

Function 5504H (0x5504) --> Return Identification (Seagate ST01/ST02)

Call with: AX = 5504H
DL = Drive Number

Return:
AX = 4321H
BL = selected drive number (00H, 01H)
BH = number of drives attached to Host
Adapter

Comments:

Function is used to return the identification of the drive(s).

INT 13H (0x13)

Function 5505H (0x5505) --> Park Heads (Seagate ST01/ST02)

Call with: AX = 5505H
DL = Drive Number
DH = Sub function (see the comments)

Return:
Nothing

Comments:

The function is used to park the heads of the disk. It was used in the old hard disk disks however the modern hard disks do not need any external program to park their heads.

The Sub function 00H parks the heads (SCSI Stop command) and Sub function 01H un-park the heads (SCSI Start command) of the disk.

 

INT 13H (0x13)

Function 5506H (0x5506) --> SCSI Bus Parity (Seagate ST01/ST02)

Call with: AX = 5506H
DL = Drive Number
DH = Sub function Number (See
Comments)

Return:
AL = Status (00H parity checking
disabled, 01H parity checking enabled)

Comments:

Call the function with the following sub function number for DH:

Value

Description

00H

Disable parity check

01H

Enable parity check

02H

Return current parity setting

 

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