Commodore Amiga A500 Technical Reference Manual page 127

EQUIPMENT CHECK
VIA S/W INT 11H
WRITE TELETYPE (AH = 0EH)
INPUT
OUTPUT: None
READ CURRENT VIDEO STATE (AH = 0FH)
INPUT:
OUTPUT: AH = NUMBER OF SCREEN COLUMNS
OUTPUT: AX = Equipment Flags
Bits of AL:
bit 7 6 5
Bits of AH:
bit 7 6 5 4
MEMORY SIZE CHECK VIA S/W INT 12H
OUTPUT: AX = Total Memory size in Kilobytes
AL = CHARACTER TO BE WRITTEN
BL = FOREGROUND COLOR OF CHAR (USED ONLY
IN GRAPHICS MODE)
BH = REQUESTED DISPLAY PAGE (REALLY IS
IGNORED)
DS = ROM data segment
AL = CURRENT VIDEO MODE
BH = ACTIVE DISPLAY PAGE
4 3 2 1 0
3 2 1 0
124
> Diag Mode
>
1: 8087 installed
>
} RAM size
>
} * 64KB
> } Initial Video Mode
> } 0:none, 1:40 x 25 cga. 2:80 x 25 cga
3:80 x 25 mga
> } # of
>
} diskette drives - 1
> unused
> } # of
> } COM Ports
>
unused
> 1: Game Adaptor present
>
unused
> } # of
> } LPT ports