Epson LX-80, Руководство по эксплуатации

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Reassigning Codes
T h e LX - 8 0 h as a graphics command that changes one graphic s m ode
to another . Yo u can use it with many commercial graphics softw are
programs to c hange the density and shape of your printout s. The
code is <ESC> ? s n , where s is one of the four alternate gr a ph ics
codes (K, L, Y, or Z) and n is the number of the new code
(0 - 6).
For example, if y ou send the following code before you run a
grap h ics progra m , it will change every instance of mode "Y " ( h igh-
speed do u b l e - d ensity) to mode 5 (one-to-one) .
LPR I NT
CHR$(27)"?Y"CHR$(5);
As usua l , t his e xample is in Microsoft BASIC , but you can se nd the
code in a n y pro gramming l a nguag e .
Even if you do n ' t know which code your graphics program u ses, a
litt l e experime nt a tion should tell you whether the reassignin g code
can improve yo ur graphics printout s .
Many compute r s ystems automaticall y insert the control cod es for a
carriage return and a line feed a ft e r e v e ry 80 characters . Thi s i n ser-
tion is usually no problem with text , but it can spoil your gr a p hics. In
the graphics mo d e they ma y insert the control codes as extra c h arac-
ters, which cou ld be in the middle of a line .
You can usua ll y prevent these unwanted control code s with a
WIDTH sta t e m e nt s uch as the one below:
The format for your system may be different . Consult your c o m pu-
ter or comp u te r language manual to find the correct format . Th en
p u t a WIDTH s tatement in one of the first lines of all your graph ics
programs. It i s easier to put a WIDTH statement in all but the
simp l est of yo ur programs than to examine each one to see wh e t her
o r no t suc h a sta tement is necessary .
Design Your Own Graphics
This sec t ion de scribes the development of a graphics program . T he
examp l e is no t es pecially complicated , but it does include th e same
steps you wo uld use for a more complex figure so that you h ave the
basis for des i g ning graphic s on your LX-80.