IBM 770 manual B-26, Set Pointing Device

Set Pointing Device	State
Input Field
Major Function Number -		11
Minor Function Number -		ð3
Parameter 1	-	Reserved
Parameter 2	-	Bits	15-8
		Pointing device current status
		Bits	1ð, 8 - Built-in pointing device
		auto	control
		=	ðð : Disable
		=	ð1 : Enable
		=	1ð : Auto
		=	11 : Reserved

Bit 9 - External pointing device status

		=	ð : Disable
		=	1 : Enable
		Bits	15-11: Reserved
		Bits	7-ð	Request type
		=	ððh	- Current hardware
		=	ð1h	- CMOS (effective after reboot)
		Bits	7-2: Reserved
Parameter 3	-	Reserved
Parameter 4	-	Reserved
Parameter 5	-	Reserved
Output Field
Return Code	-	Error status
Auxiliary Return Code -		Reserved
Parameter 1	-	Reserved
Parameter 2	-	Reserved
		Reserved
Parameter 3	-	Reserved
Parameter 4	-	Reserved
Parameter 5	-	Reserved

B-26 SMAPI BIOS