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The prior code sequence also diverts all output to the printer ONLY! The video
display is disabled after the CTRL-I # N sequence. The way to bring it back
is by:
<CTRL I> I
In the process, the printer width defaults back to 40 columns.
Apple Mush
But how do we send control characters to the printer? The most obvious way is
with the CTRL key on the keyboard. Let's try it.
FIRST:
activate the printer by typing PR#l <return>.
SECOND: hold down the CTRL key and press I.
THIRD:
type 80N<return>.
Wonderful! Not only does nothing print on the screen, but the printer says
?SYNTAX ERROR.
Not to worry. Try pressing a few keys on the keyboard followed by <return>.
The video is disconnected, but the printer works fine. If there is a program in
memory, it will LIST fine up to 80 columns wide. To regain control of the video,
use the CTRL key again:
<CTRL I>
I <RETURN>
A cleaner way to do the same thing is with the BASIC language CHR$(9). Try:
PRINT CHR$(9) "80N"
This kicks us into the printer-only mode without an annoying ?SYNTAX
ERROR. To return, use:
PRINT CHR$(9) "I"
Type carefully as the latter doesn't show up on the screen.
Special Apple Graphics Trick for Long Lines
When printing long lines of graphics, the Apple can be quite finicky. To smooth
out the problem, add this line at the beginning of a graphics program, after the
PR#l:
9 PRINT CHR$(9); "255H"
APPENDIX F
93
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