5525B/31/32 Line Matrix Printer LinePrinter Plus Programmer's Reference

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Chapter 3 Configuring the Proprinter III XL Emulation with Control Codes
Bit Image Mode, Quadruple Density (Half Speed)
ASCII Code ESC Z n1 n2
Hex Code 1B 5A n1 n2
Dec Code 27 90 n1 n2
Purpose Selects quadruple density bit image graphics.
where
n1 + 256 n2 defines the number of data bytes to follow.
DATA = ASCII characters for the dot pattern bytes.
n1 = (Number of DATA bytes) - 256( n2 )
(remainder of division of number of DATA bytes by 256,
sometimes referred to as MOD 256)
n2 = (Number of DATA bytes) / 256
(quotient of division)
Discussion This code prints specified data as bit image graphics at
quadruple density, 240 dots per inch horizontally and 72 dots per
inch vertically. This code causes print speed to be reduced by
half. For more information, see “Bit Image Graphics” on page
143.
Example The following example produces quadruple density graphics of
the pattern used in the Single Density Bit Image Mode example.
Note that the amount of data must be quadrupled for quadruple
density (the data is used 108 times rather than 27).