BIOS / Int / Int 13 / 0B

              INT 13 - FIXED DISK - WRITE LONG (XT,AT,XT286,PS)

Input			Output
AX	0Bh		Status	Sectors Read	AX
					BX
CX	Cylinder	Sector			CX
DX	Head	Drive			DX
ES:BX	Buffer to Fill		Set if Error		CF

        The top 2 bits in CL are bits 8 & 9 of the cylinder number.

Status: See function 01h

Note:   Used for diagnostics only on PS/2 systems