IBM 770 manual SMAPI BIOS B-21

Return Code	-	Error	status
Auxiliary Return Code -		Reserved
Parameter 1	-	Reserved
Parameter 2	-	Refresh		rate	capability for
		specified mode:
		Bit ð	-	6ðHz	available
		Bit 1	-	72Hz	available
		Bit 2	-	75Hz	available
		Bit 3	-	43Hz(I) available
		Bit 4	-	56Hz	available
		Bit 5	-	7ðHz	available
		Bit 6	-	85Hz	available
		Bit 7	-	48Hz(I) available
		Bits 8-15 : Reserved (must be B'ð')
Parameter 3	-	Reserved
Parameter 4	-	Reserved
Parameter 5	-	Reserved

SMAPI BIOS B-21