Moving Players and Missiles horizontally is quite easy from Basic
using the horizontal registers 53248 - 53255, but vertical movement is
a problem as there are no registers for vertical movement. Using Basic
to redraw the image is agonisingly slow and unsatisfactory, so here is
a machine language routine to move Players and Missiles vertically.
There are plenty of REMarks in the listing to enable you to follow the
procedure for setting up Players.
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This is the first article PAGE 6 has had on Player-Missile
Graphics, one of the most powerful features of the Atari. It is also a
feature which causes much anxiety in beginners. How about some more
articles and listings from those of you who have got to grips with PM
Graphics?
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