Method for drawing circuit diagrams

A method for drawing a circuit diagram using drawing means for drawing a circuit diagram, and memory means for storing symbol data representative of symbols of fundamental elements constituting said circuit diagram and attribute data representative of attributes of said fundamental elements,

• said fundamental elements including a bipolar transistor, an FET, a resistor, a capacitor, a diode, a wiring and a pad,
• said method comprising the steps of:
• a first judging step of judging whether or not, among fundamental elements of the same type, the attribute data is corrected;
• a first displaying step of displaying an indication that an error of input is made on the drawing means, when the judgment is made that the attribute data is not corrected in the first judging step;
• a second judging step of judging whether or not the corrected attribute data coincides with the attribute data prior to correction, when the judgment is made that attribute data is corrected in the first judging step;
• a second displaying step of displaying an indication that the corrected attribute data is the same as the attribute data prior to correction on the drawing means, when the judgment is made that the corrected attribute data coincides with the attribute data prior to correction in the second judging step;
• a third judging step of judging whether or not the symbol data representative of the symbol corresponding to the corrected attribute data is stored in the memory means, when the judgment is made that the corrected attribute data does not coincide with the attribute data prior to correction in the second judging step;
• a third displaying step of displaying the symbol represented by the symbol data corresponding to the corrected attribute data on the drawing means by replacing the symbol presently displayed with the changed symbol, when the judgment is made that the symbol data representative of the symbol corresponding to the corrected attribute data is stored in the memory means;
• and
• a fourth displaying step of displaying an error indication on the drawing means.