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95
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
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