CSEG segment org 100h _start mov ax 0B800h mov es ax mov di mov ah 31

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CSEG segment
org 100h
_start:
mov ax, 0B800h
mov es, ax
mov di, 0
mov ah, 31
mov al, 1
mov es:[di], ax
mov ah, 10h
int 16h
int 20h
CSEG ends
end _start