IBM 4400 Bit Image Mode, Double Density

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Chapter 5Configuring the Proprinter III XL Emulation with Control Codes
Bit Image Mode, Double Density
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 ) define the number of data bytes to follow.
DATA =ASCII characters for the dot pattern bytes.
NOTE: The DATA can be expressed in a format with the appropriate decimal
valuesof the ASCII characters suppliedespecially in cases where the
dot patterns of nonprintable characters are required.
Comment For detailed information, see the Bit Image section in Chapter 8,
“Graphics.”
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
for double density (the data is used 54 times rather than 27).