The way Double-Strike gets this result is rather clever: the FX prints
each character in the regular fashion until it reaches either the end of
the line or the point at which you have Double-Strike turn off. Then
the FX shifts the paper up slightly and prints the Double-Strike pas-
sage again. This means that every dot in each row of the character gets
a shadow (see Figure 4-1). Double-Strike Mode fills in some of the
more visible gaps between the dots of a character. The end result is
better looking print.
Figure 4-1. Single-Strike and Double-Strike letters
Differences between Double-Strike and Single-Strike printing don’t
stop with the quality of print. Since each passage prints twice, the
throughput of the Double-Strike Mode is less than that of Single-
Strike. It’s the old trade-off between speed and print quality. With
a
normal print speed of 160 characters per second (cps), the FX still
moves along pretty quickly in the Double-Strike Mode.
Emphasized Mode
There is yet another way you can increase the boldness of your
printed characters. ESCape “E” produces what we call Emphasized
print. As in Double-Strike, each character gets two sets of dots. In
Emphasized, however, the print head does not make two passes and
does not move down the page. Instead, it slows down so that it can
print overlapping dots, and prints each dot twice, the second time
slightly to the right of the first, as illustrated in Figure 4-2.
To see Emphasized, add these lines to your program:
30
LPRINT CHR$(27)"EEMPHASIZED ADDS A TOUCH OF
CLASS"
60
LPRINT CHR$(27)"@"
62
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