INT 0x10 - 0x01 - Set Cursor Type

Request/Call:

reg	value	descr
AH	0x01
CH	xx	cursor starting scan line (cursor top) (low order 5 bits)
CL	xx	cursor ending scan line (cursor bottom) (low order 5 bits)

Use CX = 0x2000 to disable cursor

Nothing

Video	Line Count	Starting Scan Line	Ending Scan Line	Character Point Size
CGA	25	06	07	08
MDA	25	0B	0C	0E
EGA	25	06	07	0E
EGA	43	04/06	07	08
VGA	25	0D	0E	10
VGA	40	08	09	0A
VGA	50	06	07	08

cursor scan lines are zero based
cursor size can also be set via the 6845 CRT controller
cursor size can be determined using the CRTC, INT 10,3 or the BIOS Data Area bytes 40:60 (ending scan line) and 40:61 (starting scan line)
the following is a list of the cursor scan lines associated with most common adapters; screen sizes over 40 lines may differ depending on adapters.