Typical print density is 10 characters per inch horizontally and 6 characters per inch vertically. This results in the typical physical page having a maximum capacity of 66 lines and 85 characters per line. It is often the case that printing devices limit the area of the physical page by enforcing margins. The logical page is the area that can contain text, the height of this area is measured in lines and the width is measured in characters. A typical logical page is 60 lines high and 72 characters wide.
Carriage Return Moves the printer to the left edge of the logical page remaining on current line.
Line Feed Moves the printer to the next print line, keeping the same horizontal position. Horizontal Tab Moves the printer to the next horizontal tab stop. Note that it is difficult to enforce these conventions and it is therefore recommended that horizontal tabs not be used in document files. Vertical Tab Moves the printer to the next vertical tab stop. Note that it is difficult to enforce these conventions and it is therefore recommended that vertical tabs not be used in document files.