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66
Gemini
User's
Manual
Wait a minute. Didn't we use the command code CHR$(15)
to shift into compressed type? That's right; there are two ways of
shifting into compressed type: - the single-character command;
CHR$(15), and the three-character command; ESC$
+
"8"
+
3.
[Actually, that's CHR$(27); CHR$(66); and CHR$(3), if you check the
ASCII code table in Appendix I.] The command CHR$(18) can be
used to shift the printer from compressed mode back to normal
pica-size print.
Line 40 sets some variables that allow shifting into (and out
of) the superscript and subscript mode. Superscripts are
characters that are printed above the regular line of type, such as
the "2" in E
=
MC2. Subscripts are below the line, such as the "2"
in H 2 0. On some printers, the "supers" and "subs" are produced
by rolling the paper up and down a half-line, printing the
superscript or subscript, then rolling the paper back to its original
position.
Gemini prints "supers" and "subs" using special characters
that are small enough to convey the scripting in the space
normally utilized by the ascenders 'such as the top of a "t") and
descenders (the lower part of the letter "g"). The scripting
characters are printed "high" or "low" on the line to produce a
professional-looking scripting effect - without having to roll the
paper up and down by hand.
ESC$
+
"s"
+
CHR$(O) causes the printer to operate in its
superscript mode, and ESC$
+
"S"
+
CHR$(1) initiates the
subscript. Either mode is cancelled by ESC$
+
"T" command -
actually, CHR$(27); CHR$(84).
Line 50 sets the command to produce italic type. CHR$(27);
CHR$(52) causes Gemini to print in full italic all text received
subsequent to the command, until the ESC$
+
CHR$(53)
command [or printer reset
=
CHR$(27);
"@"]
is received.
Line 60 sets the command to double the width of the
characters that are being printed. CHR$(14) sets the double-width
print mode, and CHR$(20) cancels the double-width mode. ESC$
+
"W"
+
1 [which is the equivalent of CHR$(27); CHR$(87);
CHR$(1) command] also sets the double-width mode; in this case,
ESC$
+
"W"
+
0 cancels the double-width mode. You might note
that with the three type sizes, plus the double-width mode, we have
six different character sizes from which to select.
On the end of line 60 is the printer reset command we call "PRSET"
in this program.
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