IBM Personal Computer AT Manual To Operations page 215

ESCJ
Variable Line Space
ESCK
Format: ESC J;n;
Advances the paper in increments of n/144
inch. The value of n must be between 1 and
255. Line spacing of 14/144 is
recommended for bit-image graphics using
eight bits. ESC J is canceled after the line
space takes place. The value of n is not
stored.
LPRINT CHR$(27);CHR$(74);CHR$(n);
1108 Bit-Image Graphics
Format: ESC K;nl;n2;vI;v2; ...
Vl108;
Sets dot spacing to 84 by 84 dots per inch in
1: 1 aspect ratio, to 70 by 84 dots per inch
in 5:6 aspect ratio (see "ESC n (Set Aspect
Ratio)"). All bit-image graphics is printed
from left to right. If the graphics data
exceeds the space remaining on the line, the
data to be printed beyond the end of the
line is printed at the left margin on the next
line.
n l and n2 are binary numbers that specify
the number of bit-image data bytes to be
transferred. nl represents values from 0 to
255, and n2 represents values from 0 to 4
times 256. The total number of bit-image
data bytes is equal to n1
+
n2 x 256 and
cannot exceed 1108 (the total number of
dot positions in a 13.2 inch line).
Color Printer 1-105