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6–11Programming
Bit Image Mode, Double Density Double Speed
ASCII Hex Decimal
P–Series N/A N/A N/A
Serial ESC
Y
1B 59
27 89
Purpose Prints
graphics at twice the speed of Double Density (same speed as Single Density)
by ignoring adjacent dots.
Expression CHR$(27);”Y”;CHR$(n1);CHR$(n2);”DATA”
where n1 + 256 n2 define the number of data bytes to follow.
DATA = ASCII characters for the dot pattern bytes.
NOTE:
The DA
T
A can be
expr
essed in a CHR$(DA
T
A) format with the appr
opriate decimal
values
of the ASCII characters supplied,
especially in cases wher
e the dot patterns of non
-
printable
characters ar
e r
equired.
Comment For detailed information, refer to the Bit Image section in the Graphics chapter.
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).
NOTE: Depending on the host computer system, it may be necessary to include a width
statement within the BASIC program.