Low-Speed Double-Density; Consecutive Columns - Epson FX-80 User Manual

_ _ _ _ HIGH--SPEED DDUBLE-DENSITY GF':AF'HICS _ _ _ _
There are still 120 columns, only they are pressed together and printed
in half the space. They are also printed at the same speed as they are in
Single-Density Graphics.
But this High-Speed Double-Density Graphics Mode has one draw-
back. Because the dots are so closely packed, dots in the same row
cannot appear in two consecutive columns. In the above program
we've avoided the problem by never printing the same dot twice in a
row. If you try to print two consecutive dots, the printer simply ig-
nores the second one (see Figure 13-1).
Pattern
Prints as
CQ[QID
000
In double-density mode
Figure 13·1. Double·Density handling of dots in
consecutive columns.
To check this out, change the pin patterns in line 30 to:
3~
B$=CHR$(127)+CHR$(42)
I
Change
85
to 127
As Figure 13-2 shows, the dots from the CHR$(42) are not printed at
all. The print head is simply moving too fast to retract the pins and
then instantly fire them again.
Low-Speed Double-Density Graphics Mode
Ah, but the FX-80 has a special print mode for this very problem.
It's called the Low-Speed Double-Density Graphics Mode. Try these
lines:
144
2~ A$=CHR$(27)+IL"+CHR$(12~)+CHR$(~)
r
Change Y to L
5~
LPRINT
II
LOW-SPEED DOUBLE-DENSITY GRAPHICS ";