IBM 4400 User Manual
Bit Image Mode, Double Density Double Speed
121
Bit Image Mode, 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.
where:
(
n1 + 256n2) 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
values of the ASCII characters supplied especially in cases where the
dot patterns of nonprintable characters are required.
dot patterns of nonprintable characters are required.
Comment
For detailed information, see the Bit Image section in Chapter 8,
“Graphics.”
“Graphics.”
Example
The following example produces Double Density Double Speed
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).
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).