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So if quadruple density looks so great, why not use it all the
time? Let’s try an experiment on your printer which will show
just how the different modes work. Using the first program in
this chapter, change line 50 to try each of the different modes.
Just change the “0” to “l”, “2”, “3”, etc. in turn. Your printouts
should look something like this:
.---;
=----.,
---Z-.
(ESC)
“*” CHR$( 1)
,,, - -.... _ . .
‘.
. ...,
,,
(ESC)
“*” CHR$(2)
,-.
..,.n
(ESC)
I‘*” CHR$(3)
-- ----
_-----
----...._-----
--.
(ESC)
“*” CHR$(4)
‘--._ _--
m__=--__
(ESC)
“*” CHR$(S)
_-----
_--
___
__--
-- -_
(ESC)
“*” CHR$(6)
As you can see, the different modes seem to condense the
printed image. So, to get the same image in a higher density
mode, you must plot more points. This requires twice as much
memory for your array, twice as much computing time, and
twice as much printing time (but the results may be wirth it!).
Our engineers have given programmers a unique shortcut for
program development - double density double speed graphics.
Although this mode requires just as much memory and com-