Compuprint MDP40B Programmer Manual - Manual (Page 171)

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If the parameter is set to 0 or is not present, the default value is set, that is, the
maximum number of dots that can be printed per line at the density selected, minus
any left margin value.
The decimal value of parameter n defines, in elementary steps, the horizontal distance
at which two consecutive dots can be printed. If the parameter is set to 0 or is not
present, the default value (180 dpi) is set. The accepted values of parameter n are:
n Dot density
0 180 dpi
1 240 dpi
2 120 dpi
3 80 dpi
4 60 dpi
When the command is received, the printer sets the 24/180" line feed value, which
corresponds to the movement of the paper by an amount such that the consecutive
vertical dots are printed equidistantly.
The parameter consistency checks and the default values must be calculated on the
basis of the following equation:
b - c
a =

d * e
where: a = Maximum length of print line (number of dots).
b = Maximum length of printing area (in n/360").
c = Left margin (in n/240").
d = Value of parameter n.
e = Value of elementary step(1/240").