(57) A dot-matrix printer having a print head (26) and a platen (27) allowing the head
(26) to bring dot characters in normal printing mode and an extra-wide-margin printing
mode. The printer has a microprocessor (20) which decides, in accordance with printing
data from an external device, whether or not a wide dot character is to be printed
at the left margin or right margin. When it decides that a wide dot character is to
be printed at the left or right margin, the microprocessor controls a print head driver
(25) so that the head (26) may print dot characters in the extra-wide-margin printing
mode. The print head (26) can therefore print wide dot characters together with characters
of ordinary width, neatly and clearly.
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