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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"><HTML><HEAD><TITLE>VT100.net: Digital VT100 User Guide</TITLE><LINK HREF="vt100-ug.css" TYPE="text/css" REL="stylesheet"><LINK HREF="/favicon.ico" TYPE="image/x-icon" REL="shortcut icon"></HEAD><BODY><DIV CLASS="navbar"><A HREF="http://vt100.net/"><IMG CLASS="button" SRC="vt100.net-logo.png" ALT="VT100.net" HEIGHT="16" WIDTH="102"></A> VT100 User Guide<TABLE WIDTH="100%"><COL SPAN="3" WIDTH="33%"><TBODY><TR><TD ALIGN="LEFT"><A HREF="chapter5.html">Chapter 5</A></TD><TD ALIGN="CENTER"><A HREF="contents.html">Contents</A></TD><TD ALIGN="RIGHT"><A HREF="appendixb.html">Appendix B</A></TD></TR></TBODY></TABLE><HR></DIV><H1 ID="SA">Appendix A<BR>ANSI Definitions and Notation</H1><H2 ID="SA.1" CLASS="notoc">ANSI Definitions</H2><DL><DT>Active position</DT><DD>The character position on the visual display that is to display thegraphic symbol representing the next graphic character.</DD><DT>ANSI mode</DT><DD>A VT100 mode in which it recognizes and responds only to escapesequences whose syntax and semantics are in accordance with ANSI specifications.</DD><DT>Character position</DT><DD>That portion of a visual display which is displaying or iscapable of displaying a graphic symbol.</DD><DT>Control</DT><DD>A control character, an escape sequence, or a control sequence thatperforms a control function.</DD><DT>Control character</DT><DD>A character whose occurrence in a particular context initiates,modifies, or stops a control function.</DD><DT>Control function</DT><DD>An action that affects the recording, processing, transmission,or interpretation of data.</DD><DT>Control sequence</DT><DD>A sequence of characters that is used for control purposes toperform a control function, that begins with the control sequence introducer (CSI)control, and that may contain a parameter string.</DD><DT>Control sequence introducer (CSI)</DT><DD>An escape sequence that provides supplementarycontrols and that is itself a prefix affecting the interpretation of a limitednumber of contiguous characters.</DD><DT>Control string</DT><DD>A string of characters that is used to perform a control functionand that is delimited by an opening and closing delimiter control.</DD><DT>Cursor</DT><DD>A visual representation of the active position which is either a blinkingreverse-video or blinking underline.</DD><DT>Cursor control</DT><DD>An editor function that moves the active position.</DD><DT>Default</DT><DD>A function-dependent value that is assumed when no explicit value, or avalue of 0, is specified.</DD><DT>Display</DT><DD>The current active area of the screen, i.e., the area inside the scrollingregion, or the entire screen, depending on the origin mode.</DD><DT>Editor function</DT><DD>A control that affects the layout or positioning of previouslyentered or received information in a printing or cathode ray tube display and that isintended to be interpreted and executed without remaining in the data stream.(See format effector).</DD><DT>Escape character (ESC)</DT><DD>A control character that provides supplementary characters(code extension) and that is itself a prefix affecting the interpretation of alimited number of contiguous characters.</DD><DT>Escape sequence</DT><DD>A sequence of characters that is used for control purposes toperform a control function and whose first character is the escape (ESC) controlcharacter.</DD><DT>Final character</DT><DD>A character whose bit combination terminates an escape orcontrol sequence designated by F.</DD><DT>Format effector</DT><DD>A control that affects the layout or positioning of information onthe screen and that may remain in the data stream subsequent to interpretationand processing. (See editor function).</DD><DT>Graphic character</DT><DD>A character, other than a control character, that has a visualrepresentation normally handwritten, printed, or displayed.</DD><DT>Home</DT><DD>The character position at the origin. [See origin mode (DECOM).]</DD><DT>Intermediate character</DT><DD>A character whose bit combination precedes a finalcharacter in an escape or control sequence.</DD><DT>Numeric parameter</DT><DD>A string of bit combinations that represents a number,designated by Pn.</DD><DT>Parameter</DT><DD><OL><LI>A string of one or more characters that represent a single value:</LI><LI>The value so represented.</LI></OL></DD><DT>Parameter string</DT><DD>A string of characters that represent one or more parametervalues.</DD><DT>Selective parameter</DT><DD>A string of bit combinations that selects a subfunctionfrom a specified list of subfunctions, designated by Ps. In general, a control sequencewith more than one selective parameter causes the same effect as severalcontrol sequences, each with one selective parameter, e.g., CSI Psa; Psb; Psc F isidentical to CSI Psa F CSI Psb F CSI Psc F.</DD><DT>VT52 mode</DT><DD>A VT100 mode in which it recognizes and responds only to escapesequences which DEC VT52 type terminals use.</DD></DL><H2 ID="SA.2" CLASS="notoc">Notation</H2><DL CLASS="compact"><DT><CODE>I</CODE></DT><DD>An intermediate character in an escape sequence or a control sequence, where<CODE>I</CODE> is from 40<SUB>8</SUB> to 57<SUB>8</SUB> inclusive.</DD><DT><CODE>F</CODE></DT><DD>A Final character in:<OL><LI>An escape sequence, where F is from 60<SUB>8</SUB> to 176<SUB>8</SUB> inclusive.</LI><LI>A control sequence, where F is from 100<SUB>8</SUB> to 176<SUB>8</SUB> inclusive.<DL CLASS="compact"><DT><STRONG>Pn</STRONG></DT><DD>A numeric parameter in a control sequence, where Pn is a string ofzero or more characters from 60<SUB>8</SUB> to 71<SUB>8</SUB> inclusive.</DD><DT><STRONG>Ps</STRONG></DT><DD>A variable number of selective parameters in a control sequence,with each selective parameter separated from the other by 73<SUB>8</SUB>. Ps is astring of zero or more characters from 60<SUB>8</SUB> to 71<SUB>8</SUB> inclusive and 73<SUB>8</SUB>.</DD></DL></LI></OL></DD></DL><P>Example: The format of an escape sequence as defined in AmericanNational Standard X3.41-1974 and used in the VT100 is:</P><BLOCKQUOTE><P><CODE>ESC I ... I F</CODE></P></BLOCKQUOTE><P>Where:</P><OL><LI><CODE>ESC</CODE> is the introducer control character (33<SUB>8</SUB>) that is named escape.</LI><LI><CODE>I ... I</CODE> are the intermediate bit combinations that may or may not bepresent. I characters are bit combination 40<SUB>8</SUB> to 57<SUB>8</SUB> inclusive in both 7-and 8-bit environments.</LI><LI><CODE>F</CODE> is the final character. <CODE>F</CODE> characters are bit combinations 60<SUB>8</SUB> to 176<SUB>8</SUB>inclusive in escape sequences in both 7- and 8-bit environments.</LI><LI>The occurrence of characters in the inclusive ranges of 0<SUB>8</SUB> to 37<SUB>8</SUB> withinan escape or control sequence, is technically an error condition whoserecovery is to execute immediately the function specified by the characterand then continue with the escape sequence execution. The exceptionsare: If the character <CODE>ESC</CODE> occurs, the current escape sequence isaborted, and a new one commences, beginning with the <CODE>ESC</CODE> just received.If the character CAN (30<SUB>8</SUB>) or the character SUB (32<SUB>8</SUB>) occurs,the current escape sequence is aborted.</LI></OL><DIV CLASS="navbar"><HR><TABLE WIDTH="100%"><COL SPAN="3" WIDTH="33%"><TBODY><TR><TD ALIGN="LEFT"><A HREF="chapter5.html">Chapter 5</A></TD><TD ALIGN="CENTER"><A HREF="contents.html">Contents</A></TD><TD ALIGN="RIGHT"><A HREF="appendixb.html">Appendix B</A></TD></TR></TBODY></TABLE><DIV CLASS="navbot">http://vt100.net/docs/vt100-ug/appendixa.html</DIV></DIV></BODY></HTML>?? 快捷鍵說明
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