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Table 6-4
Eighth bit controls
Function
Control code
Turn the eighth bit ON
(ESC) “)” (except IBM-P mode)
Turn the eighth bit OFF
(ESC) “=“(except IBM-P mode)
Accept the eighth bit “as is” from (ESCj ,,#,, (except IBMsP modeJ
the computer
n Block graphics characters and special symbols
Besides the upper and lower case letters and symbols that we
are by now familiar with, your printer has a whole different set
of characters that are for special uses. These characters include
block graphics for drawing forms and graphs, and special sym-
bols for mathematical, engineering and professional uses. The
special characters are included in two character sets. The
character set you normally use with the IBM modes is called
character set #l. The special characters are printed out when
you send ASCII codes 160 - 255 to the printer.
Your printer also offers character set #2 which is almost the
same as character set #l except for the addition of ASCII codes
3
- 6, 21, and 128 -
159. Character set #2 is selected with
(ESC) “6”; to go back to character set #l, use (ESC) “7”.
You can also specify the power-on default character set by set-
ting DIP switch l-5 on for character set #1 and off for character
set #2 while the IBM modes are selected. The following pro-
gram will print out all of the graphics characters available:
10 LPRINT CHRS(27);"O";
20
LPRINT CHR$(27);"6";
30
FOR J=3 TO 6
40
LPRINT '
";J;CHR$(J);CHR$(9);
50
NEXT J
60 LPRINT ' 21 ";CHR$(21)
70
LPRINT
80
FOR J=128 TO 254 STEP 5
90 FOR I=J TO Jt4
100
IF I>254 THEN 140
110
LPRINT I;CHR$(I);CHR$(9);
120
NEXT I
130
LPRINT :LPRINT
140
NEXT J