Epson LX-90 User Manual - Parallel 8620 PIC for LX-90 - Page 62

Density Varieties, Table, Graphics modes

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Density Varieties Although all the examples so far in this chapter have been in the single-density graphics mode, the LX-90 offers five other eight-pin density modes and two nine-pin ones. Nine-pin graphics is not necessary for most uses, but you can find its command (ESCape "^") in Appendix B. All the eight-pin densities and their commands are described in Table 8-1. Mode 0 1 2 3 4 5 6 Table 8-1. Graphics modes Density Single Low-Speed Double High-Speed Double Quadruple CRT graphics One-to-one (plotter) CRT graphics II Alternate code Description ESC "K" 60 dots per inch; 480 dots per 8" line ESC "L" 120 dots per inch; 960 dots per 8" line ESC "Y" Same density as Mode 1, but faster; does not print consecutive dots in a row. ESC "Z" 240 dot positions per inch; 1920 dots per 8" line; does not print consecutive dots in a row. none 80 dots per inch; 640 dots per 8" line none 72 dots per inch; 576 dots per 8" line; produces the same density horizontally as vertically none 90 dots per inch; 720 dots per 8" line You are familiar with the command format that uses the ESCape code and a letter, but LX-90 graphics commands can also be in the following format: LPRINT CHR$(27)"*"CHR$(m)CHR$(n1)CHR$(n2); with m being the mode number found in the left column of Table 8-1. As usual, nl and n2 reserve the number of columns for graphics. The seven modes include six densities, with two speeds for double-density. 60

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Density Varieties
Although all the examples so far in this chapter have been in the
single-density graphics mode, the LX-90 offers five other eight-pin
density modes and two nine-pin ones. Nine-pin graphics is not neces-
sary for most uses, but you can find its command (ESCape "^") in
Appendix B. All the eight-pin densities and their commands are
described in Table 8-1.
Table
8-1.
Graphics modes
Alternate
Mode
Density
code
Description
0
Single
ESC “K”
60 dots per inch;
480 dots per 8” line
1
Low-Speed
ESC “L"
Double
120 dots per inch;
960 dots per 8” line
High-Speed
ESC “Y”
2
Double
Same density as Mode 1,
but faster; does not print
consecutive dots in a row.
Quadruple
ESC “Z”
3
240 dot positions per inch; 1920
dots per 8” line; does not print
consecutive dots in a row.
4
CRT
none
graphics
80 dots per inch;
640 dots per 8” line
One-to-one
none
(plotter)
72 dots per inch;
5
576 dots per 8” line; produces
the same density horizontally as
vertically
6
CRT
none
90 dots per inch;
graphics II
720 dots per 8” line
You are familiar with the command format that uses the ESCape
code and a letter, but LX-90 graphics commands can also be in the
following format:
LPRINT CHR$(27)"*"CHR$(m)CHR$(n1)CHR$(n2);
with m being the mode number found in the left column of Table 8-1.
As usual, nl and n2 reserve the number of columns for graphics. The
seven modes include six densities, with two speeds for double-density.
60