Commodore Amiga A2000 - INTRODUCING SOUND GENERATION

WRlTE TELETYPE (AH = OEH)
INPUT AL
= CHARACTER TO BE WRITTEN
BL
= FOREGROUND COLOR OF CHAR (USED ONLY
IN GRAPHICS MODE)
BH
= REQUESTED DISPLAY PAGE (REALLY IS
IGNORED)
OUTPUT: None
READ CURRENT VIDEO STATE (AH = OFH)
INPUT: DS
= ROM data segment
OUTPUT: AH
= NUMBER OF SCREEN COLUMNS
AL
= CURRENT VIDEO MODE
BH
= ACTIVE DISPLAY PAGE
EQUIPMENT CHECK
OUTPUT: AX = Equipment Flags
VIA S/ W INT 11 H
BI~\ ol AL
> Diag Mode
> I. 80x7 installed
I L > RAM size
l I
> ) * 64KB
L
> } Initial Video Mode
> ) 0:none. 1 :40 X 25 cga. 2:80 X 25 cga.
3:80 X 25 mga
I 1 >)#of
> } diskette drives - I
Bil\ 01 AH.
> ) COM Pons
> unuhed
Ill
I
> I : Game Adaptor present
I I
> unused
I > j ~m ports
MEMORY SIZE CHECK VIA S/ W INT 12H
OUTPUT: AX = Total Memory size in Kilobytes