What is saved a ctl file?
Everything that is autorouter-specific. The number of routing layers and their preferred directions, the routing grid, the number of Optimize passes and all the values for cost factors and routing parameters. Details concerning routing parameter can be found in the manual. 7. How can I Pre-Define my own Grid for Layout, Schematic, or Library? EAGLE uses in each Editor window a certain default value for the drawing grid. In the Schematic Editor, for example, it’s set to 100 mil, the Layout Editor uses a default grid of 50 mil. This can be changed in the file eagle.scr. This script file can be found in the in the folder scr, a sub-directory of the EAGLE program folder. Please edit this file with a simple text editor. If you would like to change the setting for the Layout Editor, look for the section BRD: in the file. GRID MM 1.27 DOTS ON; sets the grid to 1.27 millimeters and displays it as dots as soon as a BRD file will be opened. The semicolon terminates the command line in the script
