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, Double Density (Half Speed)
ASCII Code ESC L n1 n2
Hex Code 1B 4C n1 n2
Dec Code 27 76 n1 n2
Purpose Selects double 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 double
horizontal density, 120 dots per inch horizontally and 72 dots per
inch vertically. This code causes print speed to be reduced by
half from normal density speed. For more information, see “Bit
Image Graphics” on page 143.
Example The following example produces Double Density Bit Image
graphics of the pattern used in the Single Density Bit Image
Mode example. Note that the amount of data must be doubled in
order to produce this pattern for double density (the data is used
54 times rather than 27).