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June 23, 2010 T13/2132-D Revision 3
Working Draft Enhanced Disk Drive - 4 (EDD-4) 35
8.7 Get Drive Parameters (FN 08h)
This function shall be used to find the CHS geometry used by INT 13h functions 2, 3, and 4 to access the drive.
Entry
AH 08h
DL BIOS device number
Exit
Carry Clear Function completed without error
AH Shall be cleared to zero
BL Vendor Specific
CH Low order 8 bits of the maximum cylinder number
CL
Bit Description
7:6 high order 2 bits of the cylinder
5:0 sector number
DH Maximum head number
DL Total number of INT 13h devices with an INT 13h device number greater than
7Fh
ES:DI Vendor Specific
Carry Set Function completed with an error
AH Shall be set to the error code