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App
endix B IBM ProPrinte
r
X24 and IBM ProPrinter II Commands
B.2.7
Graphics
The printer can operate in Bit Image Mode (bit map printing), to create illustrations and
diagrams. In this way, the image is created
by printing each byte received as a vertical
line of 8 dots. A dot is printed for each bit set to "1" in the byte sent.
The least significant bit corresponds to the lowest dot on the line, while the most
si
g
nificant bit corres
p
onds to the hi
g
hest dot.
The graphic print commands only apply to one print line. The line end command
CR/LF
is
only recognized when the printer leaves graphic printing to return to alphanumeric
printing. As a result the number of bytes that can follow a command for graphics is limited
by the maximum capacity of a print line (and the graphic resolution). The data that exceeds
the capacit
y
of the line buffer is i
g
nored.
The graphic commands must therefore be repeated for each print line if you want to print
an ima
g
e consistin
g
of several lines.
One line can contain both alphanumeric and graphical characters. To calculate the space
that the al
p
hanumeric characters occu
py
inside the
g
ra
p
hics
,
a table is
p
rovided later on.
BIM Data/Capacit
y
of the print line with various resolutions
BIM Resolution
80 columns
Normal (ESC K)
480
Double (ESC L, ESC Y)
960
Quadruple
(
ESC Z
)
1920
Space occupied b
y
characters inside BIM data
The table below shows the relationship between the space occupied (as a number of
bytes) by a normal character inside a mixed print line (text + graphics).
BIM resolution:
Normal
Double
Quadruple
Pica (10 cpi)
6
12
24
Elite (12 cpi)
5
10
20
Condensed
(
17.1 cpi
)
3.5
7
14
B-21