BIOS / Int / Int 15 / C4


                 INT 15 - PROGRAMMABLE OPTION SELECT (PS50+)

Input			Output
AX	C4h	Operation		AX
BX		Clot No (AL=1)		BX
CX				CX
DX			Base POS Register Address (AL=0)	DX
ES:DI			Set on Error	CF

Operation:      00h = Return Base POS Registers Address
                01h = Enable Slot
                02h = Enable Adapter