function causes the fixed disk adapter to recalibrate itself for specified drive positioning the read/write arm to cylinder 0 returns the drive's status INT 13H (0x13) Function 11H (0x11 or 17) Recalibrate drive 12H (0x12 or 18) Controller RAM diagnostic

INT 13H (0x13)

Function 11H (0x11 or 17) >> Recalibrate drive

Call with:AH =11H
DL = drive
80H-FFH fixed disk

Returns:If function successful
Carry flag = clear
AH = 00H

If function unsuccessful
Carry flag = set
AH = status

Comments:

This function causes the fixed disk adapter to recalibrate itself for the specified drive, positioning the read/write arm to cylinder 0, and returns the drive’s status. This function is supported on fixed disks only.

INT 13H (0x13)

Function 12H (0x12 or 18) >> Controller RAM diagnostic

Call with:AH = 12H

Returns:If function successful
Carry flag = clear

If function unsuccessful
Carry flag = set
AH = status

Comments:

This function causes the fixed disk adapter to carry out a built-in diagnostic test on its internal sector buffer, indicating whether the test was passed by the returned status.

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