Epson LX-80 Density Varieties, Mode, code, Density, Alternate, Description

Line 20 begins a loop to produce multiple print lines. Lines 30 and 40 were covered above, but an LPRINT is added to line 50 to produce a line feed after line 40. Lines 60 and 70 are like lines 30 and 40 except that line 70 uses a reversal of the patterns in line 40. As the loop is executed, the program prints lines 40 and 70 alternately so that the patterns of the print lines will fit together well.

Notice that the graphics command can be in effect for only one print line. The command is in lines 30 and 60 so that it is issued each time a new print line is begun. You cannot print more than one line of graphics without having the graphics command issued more than once.

Line 90 is the reset code to return the printer to its defaults.

Density Varieties

Although all the examples so far in this chapter have been in the single-density graphics mode, the LX-80 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 9-1.

Table 9-l. Graphics modes

Mode	Density	Alternate		Description
		code
0	Single	ESC “K”	60	dots/inch:
			480	dots/8” line
1	/go;bSepeed	ESC “L”	120	dots/inch
			960 dots/8 line
2	High-Speed	ESC “Y”	120	dot positions/inch
	Double		Faster than Mode 1; does not print
			consecutive dots in a row.
3	Quadruple	ESC “Z”	240 dot positions/inch; 1920 dot
			positionsW line. Does not print
			consecutive dots in a row.
4	Epson	none	80	dots/inch;
	ox-1 OTM		640 dots/W line
			Matches the screen density of the
			QX-10, which makes it easy to do
			screen dumps.
5	One-to-one	none	I72	dots/inch:
	(plotter)		1576 dotsB” line
			Produces the same density hori-
			zontallv as verticallv. which makes
			circles look round.
6	90 dots/inch	none	90	dots/inch;
			720 dots/W line

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