Intel 815 manual Hardware Cursor, CURCNTR-Cursor Control Register

Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0

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20.4.Hardware Cursor

The hardware cursor registers are memory mapped and accessible through 32 bit accesses.

20.4.1.CURCNTR—Cursor Control Register

Memory Offset Address:	70080h
Default:	0000h
Attributes:	Read/Write

This register is double buffered. The load register is transferred into the active register on the asserting edge of Vertical Sync.

15		5	4	3	2	0
			Coord	Res	Cursor Mode
		Reserved	Origin		Select
			Select
Bit		Descriptions
15:5	Reserved.
4	Cursor Coordinate System Origin Select.
	0 = Selects the outermost upper left-hand corner of the screen border as the origin for the coordinate
	system used to position cursor. (default).
	1 = Selects the upper left-hand corner of the active display area as the origin for the coordinate system
	used to position cursor.
3	Reserved.
2:0	Cursor Mode Select. These three bits select the mode for the cursor as follows:
	000	= Cursor is disabled. This is the default after reset.
	001	= 32x32 2bpp AND/XOR 2-plane mode
	010	= Reserved
	011	= Reserved
	100	= 64x64 2bpp 3-color and transparency mode
	101	= 64x64 2bpp AND/XOR 2-plane mode
	110	= 64x64 2bpp 4-color mode
	111	= Reserved

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