Compuprint MDP40B Programmer Manual - Manual (Page 45)

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ESC !
Master Select. (EPSON ESC/P2)
ASCII Code ESC ! n
Hexadecimal Value 1B 21 n
Decimal Value 27 33 n
Range 0 < n < 255
This command selects any combination of several attributes. The parameter n is the
sum up of the printing style values to be used. See the following table:
n Style
0 10 cpi
1 12 cpi
4 Compressed
8 Emphasized
16 Double Strike
32 Double Width
64 Italic
128 Underlined
To print the desiderated combination of printing attributes, calculate the n parameter
by adding up the values of each attribute.