This standard specifies the layout of the alphanumeric area on the keyboard of GB 1988-80 "Seven-bit coded character set for information processing interchange". The standard also specifies the pairing relationship of characters and assigns characters to each key position. Considering the bit group and the corresponding character, the pairing rule is mainly based on the principle of binary bit conversion. GB/T 2787-1981 Layout of the alphanumeric area of ​​the keyboard of the seven-bit coded character set for information processing interchange GB/T2787-1981 standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China ||tt| ... 2 Definition of terms
2.1 Alphanumeric: It is a descriptive term that defines a set that mainly includes letters and numbers, and may also include punctuation marks, special characters and space characters (SP). 2.2 Control character: It is a functional character. It is inserted between other characters to start, modify or stop the execution of a certain control function. Control characters are interpreted by the machine and are not graphic symbols. They consist of characters in columns 0 and 1 in the code table. 2.3 Graphic characters: It is different from control characters and is often represented by graphics. In the code table, they consist of characters in columns 2 to 7, except for the erase character (DEL).
2.4 Conversion: It changes the working mode of the keyboard so that the same group of keys can produce the same set of characters. 2.5 Shift lock: It keeps the keyboard in the shift mode until it is restored to the non-shift mode. 2.6 Shift mode, in which the letter keys correspond to uppercase letters, and other keys correspond to the graphic characters marked on the upper part of the key surface.
2.7 Non-shift mode: In this mode, letter keys correspond to lowercase letters, number keys correspond to numbers, and the remaining keys correspond to the graphic characters marked on the lower part of the key surface. 2.8 Digging mode, the state of the keyboard when the shift control key is pressed. In this mode, no matter what the state of the shift key and the gear lock key is, the keys with control characters will generate their corresponding control characters. 2.9 Single conversion keyboard: The single conversion keyboard allows two working modes to be selected, and the same group of keys can generate two sets of sub-character sets. The two modes are: non-shift mode and shift mode. 2.10 Double conversion keyboard: The double conversion keyboard allows three working modes to be selected, and the same group of keys can generate three sets of character sets. These three modes are: non-shift mode, shift mode and control mode. 3 Character set
The characters corresponding to the bit groups generated by the non-shift mode and shift mode of the keyboard are shown in the following table: Issued by the General Administration of Standardization of Guohao
Proposed by the Fourth Ministry of Machine Building Industry of the People's Republic of China and implemented on August 1, 1982
Drafted by the Standardization Institute of the Fourth Ministry of Machine Building
GB 2787-- 81
Shift mode
Non-shift mode
4 Layout
GB 2787- 81
4.1 The layout of the oblique keyboard (see Figure 1) and the layout of the regular keyboard (see Figure 2). 99
N%N&N!N
qNWNENRNTNYNUnE
OOASOOGOK
Oovbnan
(SP）
Layout of the oblique keyboard
Note that the SP key is not controlled by the shift, gear lock and transfer control keys. ② The list of several characters on the keyboard that are easy to mix and slide is as follows: Room
No shift mode
Letters (lower case)
Shift mode
Letters (upper case)
GB 27B7 -- 81
Layout of the positive keyboard
Jiang: (1) The SP key is controlled by the shift, gear lock and transfer control keys. ② The following table lists several characters that are easy to mix and slide on the keyboard: PositionwwW.bzxz.Net
Shift mode
Letters (lowercase)
Shift mode
Letters (uppercase)
GB 278781
4.1.1 In Figures 1 and 2, the character key produces lowercase letters in the non-shift mode and produces human-written letters in the shift mode. The remaining keys produce graphic characters at the bottom of the key surface in the non-shift mode and graphic characters at the top of the key surface in the shift mode. 4.1.2 In addition to specifying the relative positions of the 8 character keys and the 1 long strip spacer character (SP) key, the positions of the two shift keys, the 1 shift lock key and the 1 shift control key are also marked in Figures 1 and 2. 1.1.3 The shift mode of the E10 key and the non-shift mode of the E00 key on the keyboard are not configured with characters. If the erase character (1) EL) key needs to be set in the alphanumeric area, it can be configured as the non-shifting position on the E00 key. 1.1.1 For keyboards that use international information exchange, the symbol "\" on the E04 key shifting position can be replaced by the symbol "". Note: If agreed upon by both parties, the symbol "" on this position can also be replaced by the symbol "". 4.2 Single-conversion keyboard
1.2.1 The layout of the single-conversion keyboard is basically the same as Figure 1 and Figure 2, and it does not include the shift control key in the figure. Practice. 2.2 The shift key and the touch lock key select the shifting mode or non-shifting mode of the keyboard. 4.3 Double-conversion keyboard
4,3.1 Effectively switch the keyboard layout between [Figure 1 and [Figure 2. 4.3.2 The selection of the keyboard non-shift mode and the shift mode is realized by the shift and gear lock keys, which are connected to the single conversion key. 4.3.3 Following the rule of binary bit pairing, the relationship between the control characters and graphic characters in the code table is as follows: Control character
[Graphic sub-character
Control character
Graphic character
1.3.4 In the control mode, the control characters are configured on the graphic character keys according to the corresponding relationship in 4.3.3. 1.3.5 The selection of the keyboard control mode is realized by the shift control key. When the shift control key is pressed, no matter what state the shift key and the gear lock key are in at this time, the key configured with the control character will generate the corresponding control code. When the shift control key is reset, the keyboard should return to the state before the shift control. GB 2787-81
Basic code table commonly used in China
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