Oki Microline 3390 User Manual page 159

You are properly using the performance of your printer if you choo-
se one of the 24-pin modes. After selecting the required density,
you can design your graphic and convert it step by step into data
for the printer. Make sure that 24-pin graphics consist of a number
of columns each composing 3 bytes.
The variables n and n
1
of bytes including attribute and graphics data which follow the
command sequence ESC [ g n
consists of a mode byte m and the number of graphic bytes sent to
the printer. In the case of 24-pin graphics, the parameters n
must take account of the number of graphic bytes determined from
the number of graphic columns times 3 and the attribute byte.
The second command ESC * m n
phics Mode (AGM). It corresponds precisely to the Epson com-
mand for high resolution graphics. A description of this command
and an example are to be found in Chapter 12.
128
64
32
Byte 1 16
8
4
2
1
128
64
32
Byte 2 16
8
4
2
1
128
64
32
Byte 3 16
8
4
2
1
Our example composes 48 columns. If the triangle is to be printed
six times one after the other, the total number of columns is given
by 6 x 48, i.e. 288.
Since each graphic column consists of 3 graphic bytes, the values
for n and n in the example graphic with 288 columns are:
1 2
1 (mode byte) + 288 (columns) * 3 (graphic bytes per column)
= 865 bytes.
From this are computed n
n = integer component (number of bytes/256), in the example:n
2
n = number of bytes - n
1
communicate to the printer the total number
2
n . The total number of data bytes
1 2
n is only valid in Alternative Gra-
1 2
and n as follows:
1 2
x 256, in the example: n
2
Chapter 11: IBM - Graphics
and n
1 2
= 3
2
= 97
1
11-5