More Print Control Commands
Chapter 3
More Print Control Commands
That last chapter was a heavy one, but it gave us a good overview of many
MX-70 features. In this chapter we’ll explore a few of them in more detail.
As before, CHR$ is the magic wand. Continue to refer to Appendix B as needed
to help maintain perspective on what we’re doing and where we’re going.
Double the Pleasure
There is an easy way to print 2 sizes of characters on the same line. We simply
switch back and forth between single and double WIDTH. The result is quite
impressive.
Type in this simple program:
9 PR #1
(Apple only. Apple disk uses:)
(9 PRINT CHR$ (4) “PR# 1”)
10 PRINT TAB(10) ;
(TRS type uses LPRINT)
20 PRINT CHRS(14) "DOUBLE
"CHR$(20)" WIDTH CHARACTERS";
30 PRINT
"ADD" CHRS(14)" EMPHASIS!"
39 PR #0
(Apple only. Apple disk uses:)
(39 PRINT CHR$ (4) “PRO”“)
and RUN.
Figure 3-l
Note carefully where the spaces are positioned in lines 20 and 30. Now study
the spaces in the printout.
When a space is placed after an ASCII 14, (double width, or CANCEL single
width), that space is printed as 2 spaces. If placed after ASCII 20 (single width),
it takes up only a single space.
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