User`s manual

8–15IBM Proprinter Emulation
Bit Image Mode, Double Density, Double Speed
ASCII Code ESC Y n1 n2
Hex Code 1B 59
Dec Code 27 89 n1 n2
Expression CHR$(27);”Y”;CHR$(n1);CHR$(n2);”DATA”
Purpose Prints double density graphics at twice the speed of double density by
ignoring adjacent dots.
where n1 + 256 n2 define the number of data bytes to follow.
DATA = ASCII characters for the dot pattern bytes.
Discussion This code can occur at any place in the datastream and is acted upon
immediately. For more information, see “Graphics,” page 8–5.
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). Depending on the host
computer system, it may be necessary to include a width statement in the
BASIC program.