User`s manual

8–14 IBM Proprinter Emulation
Bit Image Mode, Double Density
ASCII Code ESC L n1 n2
Hex Code 1B 4C
Dec Code 27 76 n1 n2
Expression CHR$(27);”L”;CHR$(n1);CHR$(n2);”DATA”
Purpose Selects Double Density Bit Image graphics.
where n1 + 256 n2 define the number of data bytes to follow.
DATA = ASCII characters for the dot pattern bytes.
Discussion All data following this code are printed in bit image graphics at double
the current horizontal dot density. The current vertical dot density is
unchanged. This code can occur at any place in the datastream and is
acted upon immediately, though print speed is reduced by half.
For detailed information, see “Graphics,” page 8–5.
Example The following example produces Double Density 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.