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June 23, 2010
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
ES:DI Vendor Specific
Carry Set Function completed with an error
Working Draft Enhanced Disk Drive - 4 (EDD-4)
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
AH Shall be set to the error code
T13/2132-D Revision 3
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