Compuprint MDP40B Programmer Manual - Manual (Page 175)

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The allowed values of the n parameter are:
n Dot density
0 180 dpi
1 360 dpi
2 240 dpi
3 120 dpi
4 60 dpi
Upon receiving the command, the printer forces the line spacing value to 24/180",
which corresponds to the displacement of the paper by such a quantity that
consecutive vertical dots are printed equidistant.
The consistency checks for the parameters, as well as the default values, shall be
computed according to the following expression:
(b - c) * d
a = ----------------
e
where: a = Maximum print line length (number of dots).
b = Maximum print field length (in n/360").
c = Left margin (in n/240").
d = Value of the n parameter.
e = Value of the elementary step (1/240").