Epson Apex-80 - Manual (Page 69)

A little experimentation should tell you whether the reassigning code
can improve your graphics printouts.
Designing Your Own Graphics
This section takes you through the development of a graphics
program. The example is not especially complicated, but it does include
the same steps you would use for a more complex figure.
You should plan your figure with dots on graph paper, but before
beginning to place the dots, you must decide which graphics density
you want. Figure 6-2 shows the differences between three common
modes so that you can choose the one you want.
In this figure you can see the main rules for graphic design in the
three densities:
l
In single-density no dots can be placed on vertical lines.
l
In high-speed double-density, dots can be placed on vertical lines, but
no dots can overlap.
l
In double-density, dots can be placed on vertical lines, and they can
overlap.
Figure 6-2.
Designing in different densities
6-10 Introduction to Dot Graphics