ZOMBIES (16K ZX81)
by D Green, Ashford, Kent
from Your Computer (February 1984), Pages 193-195

Zombies for the 16K ZX-81 is a machine-code version of the popular game
which involves escaping from things which want to kill you. The only way to
destroy these robots, zombies, or whatever you think the ZX-81 graphics
look like, is to lure them into various pitfall traps, which you are able
to jump over. Since the game is completely written in machine code, rather
than BASIC, it is extremely fast and becomes even more difficult as the
game goes on. You score 100 points for each robot that falls into a hole,
and move using the usual cursor keys.

                  Start
Name             address    Function
1.  Print At      16570     Subroutine to convert x,y coordinates into a screen location.
2.  Set           16599     Sets various variables.
3.  Print         16641     Draws border, prints holes and robots.
4.  Player Move   16782     Moves player, checks if hit wall or robot.
5.  Zomset        16851     Sets data pointers for Zommove.
6.  Zommove       16868     Moves robots, checks if hit man or hole.
7.  Check         16951     Checks if all robots are dead.
8.  Delay         16797     Delay loop to control speed.
9.  Kill          16989     Hi-res explosion, subtracts a life.
10. Wave          17043     Prints message, more robots, faster speed, etc.
11. Score         17164     Adds 100 to score.
12. Words1        17229     "Wave complete  Bonus: 500" data.
13. Words2        17229     "Score: 0000000  Lives: 3" data.