IBM 4400 Graphics, Double Density

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Chapter 6Configuring the Epson FX-1050E mulationwith Control Codes
Graphics, 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 of 120 do ts per inch
horizontally and 72 dots per inch vertically.
where: (
n1 +256 n2 ) defines 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
values of the ASCII characters supplied, especially in cases where
the dot patterns of nonprintable characters are required.
“DATA” consist of 8-bit dot columns, with the MSB at the top,
and “1” bits producing dots. For more information, refer to
Chapter 8, “Graphics.”
Comment You can change graphics density with the ESC ?command.
Example The following example produces double density bit-image
graphics of the pattern used in the standard density bit-image
mode example. The amount of data must be doubled for double
density (the data are used 54 times rather than 27).