protel 是PORTEL公司在80年代末推出的EDA软件，在电子行业的CAD软件中，它当之无愧地排在众多EDA软件的前面，是电子设计者的首选软件-protel is PORTEL introduced in the late 80' s EDA software, CAD software in the electronics industry, and it deservedly came in front of many EDA software is the software of choice for electronic designers