| 摘要 |
A dot printer comprising a printer head freely detachably attached to a carriage in the printer and a system cartridge also freely detachably attached to the printer, said system cartridge having stored a character front and a firmwear program therein, wherein the number of dots printed can be changed by exchanging the printer head and the system cartridge with those which are different in number of pins used. Printing can be thus done with any desired numbers of dots which meet various purposes and one dot printer can be used for various purposes with extremely high economy.
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