18:33
Description: A simple Assembly Language 8086 Programming Example that shows two asterisks at upper right and upper left corner of the screen and after some time they start moving towards each other and when they meet, their colors change and then they start going back to their original position.
[org 0x0100]
jmp main
clearScreen:
push ax
push di
mov ax , 0xB800
mov es , ax
mov di , 0
clearNext:
mov word [es:di] , 0x0720
add di , 2
cmp di , 4000
jne clearNext
pop di
pop ax
ret
delay:
push cx
push dx
mov dx , 0
outerLoop:
mov cx , 0xFFFF
innerLoop:
loop innerLoop
inc dx
cmp dx , 0x0009
jnz outerLoop
pop dx
pop cx
ret
main:
mov ax , 0xB800
mov es , ax
mov di , 158
mov si , 3840
mov ah , 0x0F
mov al , '*'
towards:
call clearScreen
mov [es:di] , ax
mov [es:si] , ax
call delay
add di , 154
sub si , 154
cmp si , di
jg towards
mov ah , 0x0D ;Changing
Color
away:
call clearScreen
mov [es:di] , ax
mov [es:si] , ax
call delay
sub di , 154
add si , 154
cmp di , 158
jge away
mov ax , 0x4c00
int 0x21
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