Oki 80 Series warranty Esc K

ESC K	27 75	1B 4B (hex)
	Single Density	60 x 72 DPI
	Max. dots/line	480
ESC L	27 76	1B 4C (hex)
	Double Density, half speed	120 x 72 DPI
	Max. dots/line	960
	In this mode, the printhead slows down so it can print dots that
	overlap by about 1/2 dot width.
ESC Y	27 89	1B 59 (hex)
	Double Density, normal speed	120 x 72 DPI
	Max. dots/line	960
	This mode has the same density as ESC L and prints at normal
	speed; however, you cannot print dots in the same row in
	adjacent columns. In other words, after you have printed a dot
	in one particular row, you cannot print on that row in the next
	column.
ESC Z	27 90	1B 5A (hex)
	Quadruple Density	240 x 72 DPI
	Max. dots/line	1920
	This mode prints dot columns that overlap by about 3/4 dot
	width. It can print only every other dot on the same row. In other
	words, after you have printed a dot in one particular row, you
	cannot print on that row in the next column.

Note: Take a minute to think through the restrictions on the ESC Y and ESC Z graphics modes. Basically, it means that you cannot print a horizontal line with fully overlapping dots. Even with the skips, dots on the same row are close enough together so that a line will appear solid. You can, however, print dots in other rows. This allows you to create much finer curves and diagonal lines in these high-density modes.

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