GB/T 5261-1994 Information processing control functions for seven-bit and eight-bit coded character sets
Some standard content:
National Standard of the People's Republic of China
Information processing-Control functions for7-bit and 8-blt coded character sets
Information processing-Control functions for7-bit and 8-blt coded character setsGB/T 5261---94
IS0 6429-1988
Replaces GB 5261---85
This standard is equivalent to the international standard ISO6429-1988 "Information processing-Control functions for7-bit and 8-blt coded character sets". 1 Subject content and scope of application
1.1 This standard specifies the control functions and their coded representation for the seven-bit code, extended seven-bit code, eight-bit code or extended eight-bit code constructed in accordance with GB2311. This standard specifies a CO set, a C1 set and some control functions derived therefrom and several single control functions.
1.2 These control functions are used in conjunction with character coded data for information exchange with character forming devices. A character forming device is a device that is capable of receiving a data stream consisting of coded control functions and graphic characters and producing character graphic output, that is, a graphic output that can be read by humans. The character graphics output is usually in the form of one or more rectangular arrays of character positions and lines, such rectangular arrays being called pages. If the device is not a pure output device but an input/output device, it is also capable of sending a data stream consisting of coded control functions and graphic characters, the data stream usually being a combination of data sent to the device and data entered locally into the device (for example, using an attached keyboard).
Control functions are defined in terms of their effect on character forming input/output devices, and therefore certain assumptions about the device structure are made. These assumptions should be as unrestrictive as possible and are described in detail in clause 6. In addition to their execution, control functions may also require the use of graphic symbols. This standard is extensible and, therefore, may include more control functions in future editions. Control functions defined in other standards may have a more restricted meaning than those defined in this standard. 1.3 The equipment to which this standard applies is equipment designed specifically for various applications and may differ greatly from one another due to their different applications. It is technically and economically unrealistic for a single device to implement all the functions specified in this standard. For any type of equipment, only a limited selection of functions suitable for the application is implemented. 2 Conformance
2.1 Types of conformance
Complete conformance to a standard means compliance with all its requirements. This conformance has only one meaning if the standard has no options. If there are options in the standard, they should be clearly marked. And any statement of conformity must include a statement indicating which options have been adopted.
This standard specifies a large number of basic functions, from which different choices can be made to meet various applications. It is therefore a standard of another nature. This standard does not mark these options, but they must be marked when making a declaration of conformance. Conformance to the marked options is called limited conformance.
2.2 Conformance of information exchange
Approved by the State Administration of Technical Supervision on December 7, 1994..com Implemented on August 1, 1995
CB/T 5261-94
Character coded data elements in coded information for exchange are considered to be consistent with this standard if the coded representation of the control function within the character coded data element meets the following conditions:
a. The coded representation of the control function specified in this standard shall always represent the control function; b. The control function specified in this standard shall always be represented by the coded representation specified for the function in this standard; c. Any coded representation reserved for future standardization by this standard shall not be used. Control functions and modes not specified in this standard may appear in the information exchanged under the above conditions (see 5.5, 5.5.1 and 7.4).
2.3 Conformance of equipment
Equipment conforms to this standard if it complies with the requirements of 2.3.1 and one or all of the requirements of 2.3.2 and 2.3.3 below. Any claim of conformance shall be identified by the document containing the description specified in 2.3.1. 2.3.1 Description of equipment
Equipment conforming to this standard shall be the subject of a description that: a. identifies the coded representations that the equipment can generate or receive and interpret by reference to clauses of this standard or by control functions specified in this standard; b. specifies the parameter values implemented for each control function with optional parameters; if the identified options include control functions for which the parameter values currently specified in this standard are default values, the explicit and implicit indications of the default values shall be included; d. identifies the means by which the user may provide the corresponding control functions or may identify the available control functions, as specified in 2.3.2 and 2.3.3 respectively.
2.3.2 Transmitting Equipment
A transmitting equipment shall be capable of transmitting within a character coded data element the coded representation of a control function option that has been indicated in accordance with this standard. Such an equipment shall allow the user to provide any control function selected from the indicated options so that its coded representation is transmitted within a character coded data element. 2.3.3 Receiving Equipment
A receiving equipment shall be capable of receiving and interpreting within a character coded data element the coded representation of a control function option that has been indicated in accordance with this standard, and shall be capable of interpreting both explicit and implicit default values. Such an equipment shall allow the user to use any control function that has been indicated as an option, and receive its coded representation within a character coded data element in such a way that the user can distinguish it from the control functions that have been indicated as an option. 3 Referenced Standards
The following standards are referenced in the text of this standard to form some of the provisions of this standard. At the time of publication of this standard, the following referenced standards are the latest versions at that time. All standards may be revised. It is recommended that users who have agreed to base their decisions on this standard should investigate the possibility of adopting the latest versions of the following standards.
GB2311 Information processing Code expansion technology for seven-bit and eight-bit code sets GB3453 Basic control procedures for data communication
Information processing Coded character set for text communication GB 8565
GB12054 Registration procedures for escape sequences for data processing ISO6937
Information processing Coded character set for text communication IS07350 Registration of graphic character subsets for text communication Information processing Text and office systems Office document architecture (ODA) and interchange formats Part 6: ISO 8613-61
Character interpenetration architecturebzxZ.net
Coded character set for use with escape sequences 1SO International Registration Table CCITT T.61 Recommendation International Intelligent Telegraph Character List and Coded Character Nests 4 Notation and Terminology
4.1 Notation
GB/T 5261--94
This standard adopts a reader-friendly convention that capital letters (or Chinese characters with underscores) are used to indicate a specific control function, mode, mode setting, or graphic character to avoid confusion between concepts such as space and the SPACE character.
This standard uses the xx/yy form of notation, where xx represents column numbers 00 to 7 in the seven-digit code table and 00 to 15 in the eight-digit code table. yy represents line numbers 00 to 15. 4.2 Terminology
This standard uses the following term definitions
4.2.1 Active area
The area containing the operating position.
4.2.2 Active field
The field containing the operating position.
4.2.3 Active line
The line containing the operating position.
4.2.4 Operation page activecpagc
Contains the negative of the operation position.
4.2.5 Operation position active pasitian The character position that will be displayed to represent the next graphic character or the next graphic symbol of the control function that requires graphic representation. The operation position is usually indicated by a bit mark.
4.2.6 area
A series of adjacent character positions. These adjacent character positions do not necessarily have to be in the same line. 4.2.7 auxiliary device A device connected to a character or graphic device for the purpose of inputting, storing, retrieving data or converting data into graphics. 4.2.8 Bit combination
An ordered collection of several binary bits used to represent a coded character or a part of a coded character. 4.2.9 byte byte
a string of binary bits that is processed as a unit. 4.2.10 to cancel
a mark on data in such a way that it can be ignored by subsequent processing. 4.2.11 character charactcr
an element in a set of elements used for interweaving, controlling, or representing data. 4.2.12 character-coded-data-element character-coded-data-element (cc-data-element) an element in an exchange message consisting of a series of coded representations that conform to one or more of the coded character sets that have been standardized.
4.2.13 character-imaging device a device (e.g., a cathode ray tube display or printer) that uses a technique to visually represent data in the form of graphic symbols.
4. 2. 14 character path
the direction in which a series of graphic characters are displayed along a line. 4.2.15 character position character position the position of the screen where a graphic symbol is being displayed or can be displayed. 4.2.16 to clear
GB/T 5261—94
remove the information displayed on the data or used for data display, such as the tabulation stop that marks the boundary between fields. 4.2.17 coded character set: code coded character ser code a set of clear rules used to determine the one-to-one correspondence between character nests and the individual characters and their bit groups in the character set. 4.2.18 code extension code extension technology for encoding characters not included in the character set of a given code. 4.2.19 code table codetablc
a table that represents each character in the code corresponding to its specified bit group. 4.2.20 control character controlcharactcr a character with a control function, whose coded representation consists of a single bit group. 4.2.21 control function control function an action that affects data recording, processing, transmission or interpretation, whose coded representation consists of one or more bit groups. 4.2.22 control sequence control sequence a string of bytes beginning with the control character control sequence initiator (CSI) used as the coded representation of a control function with parameters. 4.2.23 control string a delimited string of characters that may appear in a data stream as a logical unit for control purposes. 4.2.24 cursor
a special indicator used to mark the position of an operation on a display screen. 4.2.25 decimal mark
a graphic symbol, usually a dot, used to separate the integer and fractional parts of a decimal number. 4.2.26 default
a value or state to be assumed when no value or state is explicitly specified. 4.2.27 delete to dclctc
removes the contents of a position and closes the gap created by moving the adjacent graphic character to the empty position. 4.2.28 to designate
to identify in a specified manner a group of characters to be provided, in some cases immediately, in other cases only after another control function occurs.
4.2.29 device
a part of an information processing apparatus that can send and/or receive information encoded in character-coded data elements (in the general sense this may be an input/output device or a process in an application or gateway function). 4.2.30 display
the area on any type of character-forming device (including printers, cathode-ray tubes, and similar devices) used for the visual representation of data.
4.2.31 editor function a control function used to edit, modify, or move a regular arrangement of data. 4.2.32 eligible
a term used to designate an area used for sending or transmitting. 4.2.33 environment environcnt
In a data processing or data communications system, or in a portion of such a system, a property identifying the number of unary digits used to represent a character.
4.2.34 erase to erase
Remove the contents of a character position and leave the resulting gap empty. 4.2.35 escape sequence
escape sequence
GB/T 5261-94
In the code expansion process, a string of unary digits used for control purposes, consisting of two or more digit groups, the first of which is the escape character.
4.2.36 field field
The area consisting of the character position (beginning of paragraph) where a word tab stop is located and the character position (end of field) where the next word tab stop is located (excluding the end of field). 4.2.37 final byte
a group of bits that terminates an escape sequence or control sequence. 4.2.38 formatorfunction a control function that describes how the originator of a data stream wants the information to be formatted or presented. 4.2.39 graphic character a character that has a visual graphic, usually used for writing, printing or displaying, and has a coded representation consisting of one or more groups of bits. 4.2.40 graphic presentation gtaphie: rendition display - the visual style of a group of graphic symbols. 4.2.41 graphic symbol graphie: a symbal visual representation of a graphic character or control function. 4.2.42 guarded area
a specific situation of a restricted area.
4.2.43 initial slate
the state in which the equipment is put into operation. The \reset\ state of a mode is its initial state. 4.2.44 Intermediatebyte There are two forms of intermediatebyte:
a. In an escape sequence, the group of bytes that may appear between a control function escape (ESC) and the terminating byte. b.
In a control sequence, the group of bytes that may appear between a control function control sequence initiator (CSI) and the terminating byte, or between a parameter byte and the terminating byte.
4.2.45 to invoke
Uses a predetermined group of bytes to represent a specified character set until the appropriate code expansion function appears. 4.2.46 line
A set of character positions with a predetermined number of characters. 4.2.47 lineprogression
The direction of progression of adjacent lines.
4.2.48 operating system
operatingsystem
Software that controls the execution of computer programs and can provide scheduling, debugging, input and output control, calculation, compilation, storage allocation, data management and related services.
4.2.49 page
a group of lines of a predetermined number.
4.2.50 parameter byte
a group of bytes that may appear in a control sequence between a control sequence initiator (CSI) and a terminating stanza or between a CSI and an intermediate byte. 4-2.51 position
a portion of a code table identified by column and row coordinates. 4.2.52 private (or experimental)a method of indicating a nonstandard control function that is compatible with this standard in some way. 4.2.53 protected are:
a special case of a qualified area.
4.2.54 qualified area
a symbol position associated with a characteristic. 4.2.55 General table Icpcrtoire
GB/T 5261-94
The character nest that can be represented by the coded representation of the coded character set. 4.2.56 scroll
The action of moving all or part of the graphic symbols on the display in a specified direction. 4.2.57 selected area
A character position string,The character string may be suitable for transmission in the form of a data stream or for transmission to auxiliary input and output devices.
4.2.58 Tabulation
Technique for marking character positions or lines on a display in order to arrange information in an orderly manner. 4.2.59 Tabulation stop Tabulation stop is used as an indicator of character positions or lines for tabulation. A tabulation stop may also be used as a boundary between fields. 4.2.60 User
A person or other entity that invokes the services provided by a device (for example, if the device is a transcoder or gateway function, this entity may be an application such as an application). 5 Coded representation
5.1 Overview
Each control function in this standard (except deletion) belongs to one of the following categories: element in a CO set
element in a C1 nest;
control sequence;
d. single control function,
control string.
5.2 Deletion
This control function does not belong to any set. For reference purposes, it is considered to be an element of the Cx set. 5.3 Elements of the Co set
These control function functions are represented in bit groups 00/00 to 01/15 in seven-bit and eight-bit codes. This representation allows up to 32 control functions to be coded. The coding representation and definition of the control functions are specified in 8.3 (and see Table 1). The three-character escape sequence that indicates and invokes this CU set is ESC02/0104/00. NOTE It has been assumed that the control character escape is available even if the CO set is not invoked, and is also represented in bit group 01/11. Table 1 Bit group representation of the control functions of the Co set
5.4 Elements of the C1 set
These control functions are represented as follows:
GB/T 5261—94
Continued Table 1
SI or LSO
In the seven-bit code, it is represented by the two-character escape sequence ESCFe.HSC! Bit group 01/11, Fe is represented by the bit group between 04/00 and 05/a.
15.
bIn the eight-bit code, it is represented by the bit group between 08/0D and 09/15, but if the sequence ESC02/0004/06 is used according to GB2311, the control functions of the C1 set are represented by the ESC Fe sequence. The definition and coding representation of the control functions are specified in 8.3 (see also Table 2). The three-character escape sequences that designate and invoke the C1 set are ESC02/0604/00 and ESC:02/02 04/03. Table 2 Byte representation of the control functions of the C1 set
Seven-bit code
Eight-bit code
Seven-bit code
Eight-bit code
GB/T 526194
Continued Table 2
Unassigned byte groups are reserved for future standardization and shall not be used. They shall not be used for special (or experimental) purposes: 1) Appendix E (Participating).
5.5 Control sequence
A control sequence consists of a sequence of byte groups, which begins with the control character control sequence initiator (CSI), followed by one or more byte groups representing parameters (if any) and one or more byte groups identifying control characters. CSI itself is an element in the C1 nest. The format of the control sequence is:
CsI P..pi.IF
Where:
a: In the seven-bit code, CSI is represented by the bit group 01/11 (representing ESC) and 05/11, and in the eight-bit code by the bit group 09/11, see 5.4.
bPF is the parameter byte, if any, it consists of the bit group between 03/00 and 03/15. c
1I is the middle byte, if any, it consists of the byte group between 02/00 and (2/15. It identifies the control function together with the termination byte.
Note: The number of middle bytes is not specified in this standard. In fact, one middle byte is sufficient because it can identify more than one control function in this way.
d, to is the termination byte, it consists of the byte group between 04/00 and 07/14, it terminates the control sequence and identifies the control function together with the middle byte (if any). The byte group 07/00 to 07/14 is used as the termination byte of a special (or experimental) control sequence. The definition and coding representation of the control function are specified in 8.3 (see also Tables 3 and 4). Table 3 Termination byte of control sequence without middle byte
GB/T 5261-94
Continued Table 3
Unassigned byte groups are reserved for future standardization and shall not be occupied. The termination byte of a control sequence with a single intermediate byte 02/00 shall not be occupied. Table 4
Unassigned byte groups are reserved for future standardization and shall not be occupied. Note: 1) See Appendix E (reference document).
5.5.1 Parameter representation
GB/T 5261-94
A control sequence may include a parameter byte string PP representing one or more parameters to complete the technical specification of the control function. The parameter byte is a byte between 03/00 and 03/15. The parameter string is interpreted as follows: 1. If the first byte of the parameter string is a number in the range of 03/00 to 03/11, the parameter string is interpreted in the format described in 5.5.2. b. If the first byte of the parameter string is a number in the range of 03/12 to 03/15, the parameter is for special use (or experimental use). Its format and meaning are not specified by this standard.
5.5.2 Parameter string format
A parameter string that does not begin with a byte group in the range 03/12 to 03/15 shall have the following format: a. A parameter string consisting of one or more parameter substrings, each representing a decimal number. b. Each parameter substring consists of one or more byte groups in the range 03/00 to 03/10. Byte groups in the range 03/00 to 03/09 represent digits up to nine; byte group 03/10 may be used as a separator of parameter substrings, for example to separate the integer part of a number from the decimal fraction part.
Parameter substrings are separated by a byte group 03/11. Bit groups 03/12 to 03/15, except as the first byte group of a parameter string, are reserved for future standardization. d.
An empty parameter substring represents a default value, which depends on the control function, see 7.2.20. In each parameter substring, the first byte 03/00 is meaningless and can be omitted. If the parameter substring consists only of byte 03/f.
00, at least one of them is retained to indicate that the parameter substring is a value, see 7.2.20. g. If the parameter substring begins with byte 03/11, an empty parameter substring is considered to exist before the delimiter. If the parameter substring is terminated by byte 03/11, an empty parameter substring is considered to exist after the delimiter. If the parameter string contains consecutive byte 03/11, an empty parameter substring is considered to exist between the delimiters.
h. If the control function has more than one parameter and some parameter substrings are empty, the delimiter (byte 03/11) must still be present. However, if the last parameter sub-item is NULL, the separator preceding it may be omitted, see B2 of Appendix B (reference material). 5.5.3 Parameter types
In a control sequence with parameters, each parameter sub-item corresponds to a parameter and represents the value of that parameter. The number of parameters may be fixed or variable, depending on the control function. If the number of parameters is variable, this standard does not specify either the maximum number of actions to be performed or their order.
Parameters may be pure numbers or optional parameters, i.e., the number of actions that the control function can perform. In the case of optional parameters, a specific parameter value may have the same meaning as a combination of two or more independent values. Unspecified optional parameter values are reserved for future standardization. 5.6 Individual control functions
These control functions are represented by the two-character escape sequence ESCF* in seven-bit and eight-bit codes, where ESC is represented by the group 01/11 and F by a group in the range 06/00 to 07/11. The definitions and encodings of these control functions are specified in 8.3 (see also Table 5). Note: ESCF sequences are recorded in the International Registration of Coded Characters (ISO) together with the escape sequence. This registration is managed by the 102375 registration office. The use of ESCF sequences must be registered with ISO/IEC JTC1/SC2 and then the encoding of the termination byte is specified in the registration. 5.7 Control string
A control string is a character string with a definite boundary, which can appear in the data stream as a logical unit for control. A control string consists of a start delimiter, a command string or character string, and an end delimiter (string terminator ST). A command string consists of a character string represented by a byte group in the range of 00/08 to 00/13 and 02/00 to 07/14. A command string consists of a character string represented by any byte group other than the start of the string (SOS) or the string terminator (ST). The interpretation of the command string or character string is not specified by this standard, but needs to be agreed upon in advance between the data sender and the receiver. Table 5 Single control function
GB/T 5261-94
Unassigned byte groups are reserved for future standardization and shall not be occupied. They shall not be used for special (or test) purposes. The start delimiters specified in this standard are: Application Program Command (APC); Device Control String (DCS); Operating System Command (OSC); Privacy Message (PM); Start of Application (SOS). 6 Equipment-Related Concepts The definitions of control functions in this standard are based on general assumptions about the structure of character-forming equipment. Examples of equipment that conform to these concepts are character digital displays, printers, or microfilm input equipment. 6.1 Received Data Stream The received data stream is considered to be a continuous data stream. It can be composed of messages, records and/or blocks, but this does not affect the operation of the abstract device described in this standard. Multiple logical units or physical units of data are cascaded together to form a continuous data stream. The device can have a buffer memory, and the received data is temporarily stored in the memory before being used to generate character graphic output, or the received data is permanently stored in the memory and continuously used to generate character graphic output. 6.2 Character shaped output
Character shaped output can be composed of one or more pages of predetermined size. GB/T5261-94
Gong is composed of a predetermined number of lines, and each line is composed of a predetermined number of characters. When the device is working, it can have the ability to change the number of lines per page, the number of character positions per line, the line spacing and the character spacing. The number of lines constituting a page and the number of character positions constituting a line are identified by natural numbers 1, 2, 3-. Each character position is in an erased state or generates a graphic symbol. The graphic symbol represents a spacing, a graphic symbol or a control function that requires graphic representation.
All character positions are initially in the "erased" state. Whether there is a distinction between character positions in the "erased" state and character positions that generate spaces is implementation dependent. The size of a character position may be fixed or may vary with the character being generated. In this standard, character forming output is considered to be generated in a continuous data stream, but in practice it may be provided character by character, line by line, or page by page.
Lines and character positions are numbered line-wise and word-wise in the character forming (page) output, rather than by buffer memory (if any). This standard does not specify the font design of graphic symbols. 6.3 Operation position
At any time there is a unique character position called the "operation position". The operation position is the character position that generates the character graphic, which represents the next graphic character or the next control function to be represented by a graphic in the received data stream. The operation position is also a reference position, and some format control functions or editing functions are performed at this position (see 6.4). The line containing the operation position is called the operation line. The field containing the operation position is called the operation segment. The page containing the operation position is called the operation page. The area containing the operation position is called the operation area. 6.3.1 Implicit move
If the operation position is not at the last character position of the operation line, it is moved to the next character position in the character direction. Implicit move is performed after receiving a space or graphic character, or after executing a control function that requires graphic representation. 6.3.2 Explicit move
Move the operation position to a specified character position. An explicit move is performed when a control function is executed that causes the operation position to move to the specified position. Note: A specific indicator called "position mark" is usually used to identify the operation position. ② This standard does not specify the results of the operation position movement in the following cases: 1. When the operation position is at the last character position of a line, an attempt is made to perform a magic move. b. An attempt is made to perform an explicit move, causing the operation position to move to a non-existent character position, such as attempting to perform one of the above operation position moves at a character position other than the last character of a line or the last line of a page. Depending on the hot row process, they may 1) cause a circular move:
2) cause the operation position to be masked (the condition is that graphic characters cannot be entered before the specified operation position is effectively moved), 3) cause the operation position to stop Remain in a position that allows graphic characters to be inserted, thereby replacing the previously entered characters or overlapping the previously obscured characters; 1) Make the position mark disappear from the operator's field of vision: .! The small position mark moves to the other end of the display and is offset by a row or a column; 6) Cause an action:
7) Cause other actions that depend on the execution process. 6.4 Format Control Character Functions and Editing Functions
There are two types of control functions in character forming equipment that can affect the layout or positioning of information, namely format control character functions and editing functions. The basic difference between editing functions and format control character functions is that the latter responds to the format control character action mode (FEAM), while the former does not, see Appendix A (reference)..com4). The line containing the operation position is called the operation line. The field containing the operation position is called the operation segment. The page containing the operation position is called the operation page. The area containing the operation position is called the operation area. 6.3. 1 Implicit move
If the operation position is not at the last character position of the operation line, it is moved to the next character position in the character direction. Implicit moves are performed after receiving a space or graphic character, or after executing a control function that requires graphic representation. 6.3.2 Explicit move
Move the operation position to a specified character position. An explicit move is performed when a control function is executed that causes the operation position to move to a specified position. Note: A specific indicator called "position mark" is usually used to identify the operation position. ② This standard does not specify the results of the operation position movement in the following cases: 1. When the operation position is at the last character position of a line, an attempt is made to perform a magic move. b. An attempt is made to perform an explicit move, causing the operation position to move to a non-existent character position, such as attempting to perform one of the above operation position moves at a character position other than the last character of a line or the last line of a page. Depending on the hot row process, they may 1) cause a circular move:
2) cause the operation position to be masked (the condition is that graphic characters cannot be entered before the specified operation position is effectively moved), 3) cause the operation position to stop Remain in a position that allows graphic characters to be inserted, thereby replacing the previously entered characters or overlapping the previously obscured characters; 1) Make the position mark disappear from the operator's field of vision: .! The small position mark moves to the other end of the display and is offset by a row or a column; 6) Cause an action:
7) Cause other actions that depend on the execution process. 6.4 Format Control Character Functions and Editing Functions
There are two types of control functions in character forming equipment that can affect the layout or positioning of information, namely format control character functions and editing functions. The basic difference between editing functions and format control character functions is that the latter responds to the format control character action mode (FEAM), while the former does not, see Appendix A (reference)..com4). The line containing the operation position is called the operation line. The field containing the operation position is called the operation segment. The page containing the operation position is called the operation page. The area containing the operation position is called the operation area. 6.3. 1 Implicit move
If the operation position is not at the last character position of the operation line, it is moved to the next character position in the character direction. Implicit moves are performed after receiving a space or graphic character, or after executing a control function that requires graphic representation. 6.3.2 Explicit move
Move the operation position to a specified character position. An explicit move is performed when a control function is executed that causes the operation position to move to a specified position. Note: A specific indicator called "position mark" is usually used to identify the operation position. ② This standard does not specify the results of the operation position movement in the following cases: 1. When the operation position is at the last character position of a line, an attempt is made to perform a magic move. b. An attempt is made to perform an explicit move, causing the operation position to move to a non-existent character position, such as attempting to perform one of the above operation position moves at a character position other than the last character of a line or the last line of a page. Depending on the hot row process, they may 1) cause a circular move:
2) cause the operation position to be masked (the condition is that graphic characters cannot be entered before the specified operation position is effectively moved), 3) cause the operation position to stop Remain in a position that allows graphic characters to be inserted, thereby replacing the previously entered characters or overlapping the previously obscured characters; 1) Make the position mark disappear from the operator's field of vision: .! The small position mark moves to the other end of the display and is offset by a row or a column; 6) Cause an action:
7) Cause other actions that depend on the execution process. 6.4 Format Control Character Functions and Editing Functions
There are two types of control functions in character forming equipment that can affect the layout or positioning of information, namely format control character functions and editing functions. The basic difference between editing functions and format control character functions is that the latter responds to the format control character action mode (FEAM), while the former does not, see Appendix A (reference)..com
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