also access the character from a BASIC program with the CHR$
function.
There are no rules or restrictions on the use of numbers. This
means you can use whatever is most convenient for you -
perhaps seldom-used keys can be replaced by more useful
characters. In our example, we’ll assign the flask a value of 60,
which is the code for the character “(” in the ASCII characters.
A rather arbitrary selection, but this printer doesn’t care!
Our chart would hardly be complete with just a picture of a
chemist’s flask, so in Figure 6-9 we’ve made completed grids for
some other symbols: an automobile and a gun (quite a strange
mix of characters!). The information on the grids is now com-
plete (except for proportional width data - a more advanced
topic we’ll take up shortly).
Tigure 6-9. Character designs for the three graph symbols.