Epson LX-90 Manuel d'utilisateur télécharger pdf (Page 58)

Reassigning Code

The LX-90 has a graphics command that changes one graphics

mode to another. You can use it with many commercial graphics soft-

ware programs to change the density and shape of your printouts.

The code is ESCape “?s” n, where s is one of the four alternate graphics

codes (K, L, Y, or Z) and n is the number of the new code

(O-6).

For example, if you send the following code before you run a

graphics program, it will change every instance of mode “Y”

(high-speed double-density) to mode 5 (one-to-one).

LPRINT CHR$(27)"?Y"CHR$(5)

As usual, this example is in BASIC, but you can send the code in

any programming language.

Even if you don’t know which code your graphics program uses, a

little experimentation should tell you whether the reassigning code can

improve your graphics printouts.

Column Reservation Numbers

Now that you’ve seen the rest of the 8-pin graphics densities and the

reassigning code, this section explains in more detail the part of the

graphics command that reserves the number of columns for graphics

(the numbers nl and n2 in the examples).

If you need fewer than

255

columns of graphics,

is the number of

columns you want and n2 is zero. As you can see in Table

8-1,

how-

ever, a single line will hold as many as 1920 columns in quadruple-

density. Specifying more than

255

is where the second number slot

(n2) fits in. The first number that you send (n1) indicates a number of

columns, but the second does not represent a number of columns; it is

multiplied by 256 and added to n1. The command for the maximum

number of dots you can reserve on the LX-90, then, is:

CHR$(27)"Z"CHR$(l28)CHR$(7);

or, in the other format:

CHR$(27)"*"CHR$(3)CHR$(128)CHR$(7);

which is 128 dots plus 7 times 256 dots, for a total of 1920 dots in one

row.

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Epson LX-90 Manuel d'utilisateur Page 58