Commodore Amiga A500 Technical Reference Manual page 127

Section 4.2
BIOS Entry Points
VIDEO ENTRY POINT
SET VIDEO MODE (AH
=
OOH)
VIA SIW INT 10H
INPUT:
AL
=
VIDEO MODE (0-7)
0: 40
X
25 aipha'blw
l
:
40
X
25 alpha 16 colors
2: 80
X
25 alpha blw
3: 80
X
25 alpha 16 colors
4: 320
X
200 graphics 4 colors
5: 320
X
200 graphics blw
6: 640
X
200 graphics monochrome
7: 80
X
25 alpha monochrome
SET CURSOR TYPE (AH
=
01 H)
INPUT:
CH
=
START LINE O F CURSOR (BITS 0-4)
CURSOR CONTROL OPERATION (BITS 5-6)
00
=
NON-BLINK
01
=
DON'T DISPLAY CURSOR
l 0
=
BLINK
@
111 6 FIELD RATE
1 1
=
BLINK
@
1 I32 FIELD RATE
CL
=
END LINE OF CURSOR (BITS 0-4)
SET CURSOR POSITION (AH
=
02H)
INPUT: BH
=
Page # if CRT mode is 0
->
3
(0 if graphics or monochrome)
DH
=
Row # of cursor
DL
=
Column # of cursor
OUTPUT: None
READ CURSOR POSITION
INPUT: BH
=
ACTIVE DISPLAY PAGE
(ignored and set to 0 if graphics or
monochrome mode)
RETURNED: DH
=
ROW LOCATION OF CURSOR
DL
=
COLUMN LOCATION OF CURSOR
CX
=
CURSOR TYPE
OUTPUT:
AX
=
Undefined (however, we return it
unchanged)