BIOS / Int / Int 13 / 15

               INT 13 - DISK - GET TYPE (AT,XT2,XT286,CONV,PS)

Input			Output
AX	15h		Disk Type	AX
BX				BX
CX			Number of 512 byte sectors (high)	CX
DX		Drive	Number of 512 byte sectors (low)	DX
ES:DI			Set if Error	CF

Disk Type:      0 = Disk not there
                1 = Floppy, no change detection present
                2 = Floppy with change detection
                3 = Fixed disk