Interactive GIS-based interface for time-critical application.

A drive circuit of a dot printer driving a head in horizontal reciprocating motion with respect to the feeding direction of the printing paper and impacting styluses arranged in a line toward the imprinting paper so that the requested character images can be formed on the paper which includes a comparator for comparing the drive electric current for the head drive motor with a reference value and for stopping the motor when the drive electric current exceeds the reference value and a temperature detecting element arranged in the vicinity of the drive transistor for the motor in order to detect the temperature of the transistor and to supply a temperature signal to the comparator in accordance with the current temperature of the transistor and to control the regulated value of the electric current in the comparator in accordance with the temperature fluctuation with such a drive circuit the drive electric current for the motor is controlled to be under a regulated value to protect the drive transistor, and the initial driving performance is improved by increasing the regulated value during the initial stage of motor driving.