For 486, no FPU, for MsDos FreeDos, WinXP Dos, DosBox-X ... i made that rather in a hurry, so right now i have a version without background but wall bouncing like the original. But since the competition is already over, i will tinker a bit to make it perfect :)
the blank code for everbody who can read it ^^
you can paste it to http://twt86.co/ to run in a browser
org 100h
mov al,0x13
les bp,[bx]
int 0x10
X: sub dh,95
mov al,[bp+si]
add dl,al
imul al
sub dh,ah
mov bx,dx
mov al,bh
imul al
xchg ax,dx
imul al
add dx,ax
mov ch,7
imul ax,di,byte 102
sub ch,dh
jle F
mov al,bl
cbw
idiv ch
add al,[bp+si]
xor al,bh
and al,16
mov al,31
jnz F
add al,9
F: stosb
mov ax,0xCCCC
mul di
adc byte [bp+si],cl
jmp short X
the blank code for everbody who can read it ^^ you can paste it to http://twt86.co/ to run in a browser