Olivetti PR 4 Programmer's Manual page 51

ESC * m nL nH [d]nL + 256xnH
Select bit-image mode
Hexadecimal code: 1B 2A ..
m = 0, 1
Range:
nL = 0-255
nH = 0-3
d = 0-255
Selects a bit-image mode using m for the number of dots specified by nL and nH, as follows:
m No. of
vertical
Dot Density
dots
0 8 Single density
1 8 Double Density
- Divide the number of dots to be printed by 256. The integer answer is nH and the
Notes:
remainder is nL. Therefore, the number of dots in the horizontal direction is calculated by
nL + 256 x nH.
- If the bit-image data input exceeds the number of dots to be printed on a line, the excess
data is ignored.
- d indicates the bit-image data. Set a corresponding bit to 1 to print a dot or to 0 to not print
a dot.
-
If the values of m and nH are out of the specified range, the following data are processed
as normal data.
- After printing a bit image, the printer returns to normal data processing mode.
- The relationship between the image data and the dots to be printed is shown below:
Epson TM-U950 Commands
Horizontal Direction
Adjacent dots
Permitted
Prohibited
Maximum number of dots
Paper roll
180
360
Slip
400
800
4-15