On which floor is the covering layer attached?

Protel PCB characters should be placed on the top cover or bottom cover, that is, the top screen printing layer and the bottom screen printing layer. After the pcb board is finished, the silk screen layer is generally the outermost Bai Mo word;

PROTEL is EDA software launched by Altium Company in the late 1980s. In the CAD software of electronic industry, it is well-deserved to be ahead of many EDA software, and it is the first choice for electronic designers. It has been used for a long time in China and its popularity is the highest in China. Some electronic majors in colleges and universities have specially set up courses to learn it, and almost all electronic companies are using it. When many large companies recruit electronic designers, they often write in the condition column that they will use PROTEL. The early PROTEL was mainly used as an automatic wiring tool for printed boards, running in DOS environment, with low hardware requirements. It can run in 1M memory of 286 computer without hard disk, but it has few functions, only circuit schematic drawing and printed board design, and its automatic wiring rate of printed boards is also low. Today, PROTEL has developed to DXP 2004, which is a huge EDA software. Installed more than 200 m, working in WINDOWS95 environment, it is a complete board-level omni-directional electronic design system, including circuit schematic drawing, analog and digital circuit mixed signal simulation, multi-layer printed circuit board design (including automatic wiring of printed circuit boards), programmable logic device design, chart generation, spreadsheet generation, macro operation support and other functions. It has a client/server architecture, and is also compatible with some other design software file formats, such as ORCAD, PSPICE, EXCEL and so on. The automatic wiring of its multilayer printed circuit board can reach 100% of that of high-density PCB. PROTEL software is easy to buy in China, and there are many books and instructions about PROTEL software, which provide a foundation for its popularization. Want to know more about the software function of PROTEL or download the trial version of PROTEL99, you can download it online.