The main keyboard is also called the standard typing keyboard. In addition to 47 character keys including 26 English letters, 10 number symbols, various punctuation marks, mathematical symbols and special symbols, the keyboard also has some basic function control keys.

(1) Alphabetic keys: all alphabetic keys are engraved with uppercase English letters, indicating that the upper-level symbols are uppercase and the lower-level symbols are lowercase (that is, lower-level lowercase symbols are usually entered when the key is pressed alone). Its key arrangement is the same as that of a standard English typewriter.

(2) Numeric keys 0 ~ 9: a part of the main keyboard 1 line, with numbers engraved on the key surface. Enter the key number of the low on time.

(3) Shift key: the symbol on the keyboard is "Shift" or "↑", and there is a shift key on the left and right of the fourth row of the main keyboard, which has the same function and is used for case conversion and shift symbol input.

(4) CapsLock key: located in the middle of the left side of 104 main keyboard, used to switch case input states. This keyboard is a duplicate key. Usually (in the power-on state), the system defaults to lowercase. After pressing this key, the "CapsLock" indicator light in the upper right center of the keyboard lights up, indicating that the default status is uppercase at this time, and the letters entered are uppercase letters. Click this key again, and the "CapsLock" light goes out, indicating that the status is lowercase at this time, and the input letters are lowercase letters.

(5) Space bar: Also called space bar, it is the longest key on the whole keyboard. Click this key, a blank character will be entered, and the cursor will move one space to the right.