Commodore Amiga A500 Technical Reference Manual page 126

OUTPUT: AL = CHAR READ (if recognized, else 0)
AH = ATTRIBUTE (COLOR) (If recognized, else 0)
All characters above 80h are recognized if the RAM font
vector is other than 0, else not
WRITE CHAR & ATTRIBUTE AT CURSOR POSITION (AH = 09H)
INPUT: BH = ACTIVE DISPLAY PAGE
CX = NUMBER OF TIMES TO WRITE
AL = CHAR TO WRITE
BL = CHARACTER ATTRIBUTE
OUTPUT: None
WRITE CHAR AT CURSOR POSITION (AH -0AH)
INPUT: BH = ACTIVE DISPLAY PAGE
CX = NUMBER OF TIMES TO WRITE
AL = CHAR TO WRITE
BL = Character Attribute if in a graphics mode
OUTPUT: None
SET COLOR PALETTE (AH – 0BH)
INPUT: BH = 0 FOR BACKGROUND COLOR IN BL
BL = BITS 0-4 IF BH = 0
WRITE DOT (AH=0CH)
INPUT: DX = ROW NUMBER (MODE DEPENDENT)
CX = COLUMN NUMBER (MODE DEPENDENT)
AL = COLOR VALUE
OUTPUT: AH = ?
READ DOT (AH = 0DH)
INPUT: DX = ROW NUMBER (MODE DEPENDENT)
CX = COLUMN NUMBER (MODE DEPENDENT)
OUTPUT: AH - ?
AL = COLOR VALUE
123
CHARACTER
CHARACTER
otherwise ignored
1 FOR COLOR SET NUMBER IN BL
0 FOR COLOR SET GREEN/RED/YELLOW
F BH=1
1 FOR COLOR SET CYAN/MAGENTA/WHITE
IF BH = 1