Epson FX-100 User Manual download pdf (Page 162)

for form feed-CHR$(12)--to the printer, the computer system inter-

cepts it and sends instead a series of line feeds-CHRS(10). It does this

whether the CHR$ commands represent true commands, parameters

for commands, or data. It screens out all instances of its reserved

numbers. You can see how this could upset the printing of graphics. In

this example, you would get pins 2 and

(whose sum is

10)

when you

wanted pins 3 and 4 (whose sum is 12).

Does this mean that if your computer system transmutes some con-

trol codes, you can’t use the pin patterns of those numbers in your

graphics programs? Well . . .

yes, it does. At least, not via the usual

CHR$ function. But you can often design around these problems by

using other numbers with similar patterns, or you can POKE the trou-

ble codes directly to the FX. Learning how to cope with these problems

is part of learning how to use the printer with your system. See

Appendix F for help.

Density Varieties

The FX printer offers you the 16 text densities that we printed out as

Figure 5-2, and seven graphics density settings that we list later in this

chapter (Table

11-1).

Remember that you can choose a text density by

specifying it in the Master Select ESCape code sequence, and that you

can switch densities later by changing one parameter in that code.

The FX has a similar command sequence for specifying and chang-

ing modes for its graphics densities. Here is the commands format:

LPRINT CHR$(27)"*"CHR$(m)CHR$(n

)CHR$(n

);

where m indicates the number (0 - 6) of the desired Graphics Mode,

and the settings n

and n

are the usual graphics width settings. The

seven modes include six densities and the two speeds for Double-

Density.

Before you try out any of the new graphics density settings, record

a sample line of Single-Density. To do so, enter this new program:

20 A$=CHR$(27)+"*"+CHR$(0)+CHR$(50)+CHR$(0)

30 B$=CHR$(85)+CHR$(42)

40 LPRINT A$;: FOR X=1 TO 25: LPRINT B$;: NEXT X

50 LPRINT " SINGLE-DENSITY GRAPHICS

60 LPRINT A$;: FOR X=1 TO 25: LPRINT B$;: NEXT X

70 LPRINT

80 LPRINT CHR$(27)"@"

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