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To print nine-pin graphics, send this command before your graphics data:
<ESC> h d nl n2
The variable d is a number indicating density. If d is any even number the
density will be 60 dots per inch, but if d is an odd number the density will be
120 dots per inch.
The n2 in this command, as with other graphics commands, means the
number of 256-column groups of data you are sending (between 0 and 4).
And nl is the number of leftover columns (0 to 255).
Why can n2 indicate up to 4 groups, when the limit is 3 with eight-dot
graphics? Because you send twice as many data bytes with nine-dot graphics.