This is from the EX7ALIEN sample. I'm trying to understand how this works. I think "ED" means enemies dead? That's set to 0 at the start, but it seems to be set at -1 which means don't even print " ". Shouldn't it print if the enemy is dead? MD means "missile damage"? What does EDW mean then? What does SV mean and why do you subtract it? I know SC is score.

Petit Computer's help was cumbersome. Couldn't find anything in it. But this? This is how it is done! I'm impressed.