IBM 4400 User Manual
Graphics, Double Density Double Speed
173
Graphics, Double Density Double Speed
ASCII Code ESC Y
n1 n2
Hex Code
1B 59
n1 n2
Dec Code
27 89
n1 n2
Purpose
Selects double density, double speed bit-image graphics of 120
dpi horizontally and 72 dpi vertically.
dpi horizontally and 72 dpi vertically.
where:
(
n1 + 256n2) 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.
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.”
and “1” bits producing dots. For more information, refer to
Chapter 8, “Graphics.”
Comment
This mode prints double density with no adjacent dots. It is
similar to ESC L, except that if the graphics data contain
horizontally adjacent dots, the data may print incorrectly. This
feature is widely used to move the print head precisely, by
printing blank dot columns.
similar to ESC L, except that if the graphics data contain
horizontally adjacent dots, the data may print incorrectly. This
feature is widely used to move the print head precisely, by
printing blank dot columns.
Example
The following example produces a double density, double speed
graphic image of the pattern used in the standard density
example. The amount of data must be doubled for double
density (the data are used 54 times rather than 27).
graphic image of the pattern used in the standard density
example. The amount of data must be doubled for double
density (the data are used 54 times rather than 27).