Commodore Amiga A500 - BIOS Entry Points

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 OF CURSOR (BITS 0-4)
CURSOR CONTROL OPERATION (BITS 5-6)
00
= NON-BLINK
01
= DON'T DISPLAY CURSOR
l0 = 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)