Epson MX-80 User Manual page 36

Chapter 2
Add this line:
1 0 L P R I N T C H R $ ( 2 7 ) " G "
and RUN.
A I N ' T S C I E N C E G R A N D ?
Figure 3-5
Nice and bright isn't it. Almost as good as if typed on an electric typewriter.
Dissecting Line 10
Line 10 says LPRINT Escape G. We saw that idea used in the last Chapter as
LPRINT CHRS(27)CHRS(71). 27 is of course the ASCII number for ESCAPE,
and 71 the ASCII number for the letter G. (Everybody back to Appendices A and
B.)
Most printers require escape commands to be via ASCII numbers. With the
EPSON MX series printers, the command can be sent either via C H R S ( # # ) or
with the letter itself enclosed in quotes. We used Escape " G " here since it's
shorter to type, and perhaps easier to remember.
Try to memorize these codes as we go along. They are relly not very complex
once we understand the "big picture", and constantly referring to Appendix B is
not all that exciting.
Like most other commands, Double Strike stays in effect until cancelled. We
return the Printer to normal single-strike by sending it an Escape H. Let's do it:
> L P R I N T C H R $ ( 2 7 ) " H "
and type LLIST. Check the copy to see that we are really back in the single-strike
mode.
The WALLBANGER Mode
We have one final print "quality" command. It is, in nice company, called the
EMPHASIZED PRINTING mode. Others have called it "the Wallbanger", "Jack-
hammer", "Super Whammy", etc. It is a double charged, plug it in the 440V
outlet, sock it to the paper, mode. Change our existing program to read:
10 L P R I N T C H R $ ( 2 7 ) " E "
2 0 L P R I N T "PUT ON YOUR HARDHAT!"
3 0 L P R I N T C H R $ ( 2 7 ) " F "