chapter3.html

VT100向导

<P>Alternative sequences which will accomplish the same thing:</P>
<TABLE>
<THEAD>
<TR>
<TD>&nbsp;</TD>
<TH>Sequence</TH>
<TH>Octal Representation of Sequence</TH>
</TR>
</THEAD>
<TBODY>
<TR VALIGN="TOP">
<TD>a.</TD>
<TD><CODE>ESC [ ; 4 ; 5 m</CODE></TD>
<TD><CODE>033 133 073 064 073 065 155</CODE></TD>
</TR>
<TR VALIGN="TOP">
<TD ROWSPAN="3">b.</TD>
<TD><CODE>ESC [ m</CODE></TD>
<TD><CODE>033 133 155</CODE></TD>
</TR>
<TR VALIGN="TOP">
<TD><CODE>ESC [ 4 m</CODE></TD>
<TD><CODE>033 133 064 155</CODE></TD>
</TR>
<TR VALIGN="TOP">
<TD><CODE>ESC [ 5 m</CODE></TD>
<TD><CODE>033 133 065 155</CODE></TD>
</TR>
<TR VALIGN="TOP">
<TD>c.</TD>
<TD><CODE>ESC [ 0 ; 04; 005 m&nbsp;&nbsp;</CODE></TD>
<TD><CODE>033 133 060 073 060 064 073 060 060 065 155</CODE></TD>
</TR>
</TBODY>
</TABLE>
<H4>Control Sequences</H4>
<P>All of the following escape and control sequences are transmitted from the host
computer to the VT100 unless otherwise noted. All of the control sequences are a
subset of those specified in ANSI X3.64-1977 and ANSI X3.41-1974.</P>
<H4 ID="CPR"><SPAN CLASS="mnemonic">CPR</SPAN> -- Cursor Position Report -- VT100 to Host</H4>
<TABLE WIDTH="100%">
<TBODY>
<TR>
<TD><STRONG><CODE>ESC [ Pn ; Pn R</CODE></STRONG></TD>
<TD ALIGN="RIGHT"><EM>default value:</EM> 1</TD>
</TR>
</TBODY>
</TABLE>
<P>The CPR sequence reports the active position by means of the parameters. This
sequence has two parameter values, the first specifying the line and the second
specifying the column. The default condition with no parameters present, or parameters
of 0, is equivalent to a cursor at home position.</P>
<P>The numbering of lines depends on the state of the Origin Mode (DECOM).</P>
<P>This control sequence is solicited by a device status report (DSR) sent from the
host.</P>
<H4 ID="CUB"><SPAN CLASS="mnemonic">CUB</SPAN> -- Cursor Backward -- Host to VT100 and VT100 to Host</H4>
<TABLE WIDTH="100%">
<TBODY>
<TR>
<TD><STRONG><CODE>ESC [ Pn D</CODE></STRONG></TD>
<TD ALIGN="RIGHT"><EM>default value:</EM> 1</TD>
</TR>
</TBODY>
</TABLE>
<P>The CUB sequence moves the active position to the left. The distance moved is
determined by the parameter. If the parameter value is zero or one, the active
position is moved one position to the left. If the parameter value is n, the active
position is moved n positions to the left. If an attempt is made to move the cursor
to the left of the left margin, the cursor stops at the left margin. <EM>Editor Function</EM></P>
<H4 ID="CUD"><SPAN CLASS="mnemonic">CUD</SPAN> -- Cursor Down -- Host to VT100 and VT100 to Host</H4>
<TABLE WIDTH="100%">
<TBODY>
<TR>
<TD><STRONG><CODE>ESC [ Pn B</CODE></STRONG></TD>
<TD ALIGN="RIGHT"><EM>default value:</EM> 1</TD>
</TR>
</TBODY>
</TABLE>
<P>The CUD sequence moves the active position downward without altering the column
position. The number of lines moved is determined by the parameter. If the
parameter value is zero or one, the active position is moved one line downward. If
the parameter value is n, the active position is moved n lines downward. In an
attempt is made to move the cursor below the bottom margin, the cursor stops at
the bottom margin. <EM>Editor Function</EM></P>
<H4 ID="CUF"><SPAN CLASS="mnemonic">CUF</SPAN> -- Cursor Forward -- Host to VT100 and VT100 to Host</H4>
<TABLE WIDTH="100%">
<TBODY>
<TR>
<TD><STRONG><CODE>ESC [ Pn C</CODE></STRONG></TD>
<TD ALIGN="RIGHT"><EM>default value:</EM> 1</TD>
</TR>
</TBODY>
</TABLE>
<P>The CUF sequence moves the active position to the right. The distance moved is
determined by the parameter. A parameter value of zero or one moves the active
position one position to the right. A parameter value of n moves the active position
n positions to the right. If an attempt is made to move the cursor to the right of the
right margin, the cursor stops at the right margin. <EM>Editor Function</EM></P>
<H4 ID="CUP"><SPAN CLASS="mnemonic">CUP</SPAN> -- Cursor Position</H4>
<TABLE WIDTH="100%">
<TBODY>
<TR>
<TD><STRONG><CODE>ESC [ Pn ; Pn H</CODE></STRONG></TD>
<TD ALIGN="RIGHT"><EM>default value:</EM> 1</TD>
</TR>
</TBODY>
</TABLE>
<P>The CUP sequence moves the active position to the position specified by the
parameters. This sequence has two parameter values, the first specifying the line
position and the second specifying the column position. A parameter value of zero
or one for the first or second parameter moves the active position to the first line or
column in the display, respectively. The default condition with no parameters present
is equivalent to a cursor to home action. In the VT100, this control behaves
identically with its format effector counterpart, HVP. <EM>Editor Function</EM></P>
<P>The numbering of lines depends on the state of the Origin Mode (DECOM).</P>
<H4 ID="CUU"><SPAN CLASS="mnemonic">CUU</SPAN> -- Cursor Up -- Host to VT100 and VT100 to Host</H4>
<TABLE WIDTH="100%">
<TBODY>
<TR>
<TD><STRONG><CODE>ESC [ Pn A</CODE></STRONG></TD>
<TD ALIGN="RIGHT"><EM>default value:</EM> 1</TD>
</TR>
</TBODY>
</TABLE>
<P>Moves the active position upward without altering the column position. The number
of lines moved is determined by the parameter. A parameter value of zero or
one moves the active position one line upward. A parameter value of n moves the
active position n lines upward. If an attempt is made to move the cursor above the
top margin, the cursor stops at the top margin. <EM>Editor Function</EM></P>
<H4 ID="DA"><SPAN CLASS="mnemonic">DA</SPAN> -- Device Attributes</H4>
<TABLE WIDTH="100%">
<TBODY>
<TR>
<TD><STRONG><CODE>ESC [ Pn c</CODE></STRONG></TD>
<TD ALIGN="RIGHT"><EM>default value:</EM> 0</TD>
</TR>
</TBODY>
</TABLE>
<OL>
<LI>The host requests the VT100 to send a device attributes (DA) control
sequence to identify itself by sending the DA control sequence with
either no parameter or a parameter of 0.</LI>
<LI>Response to the request described above (VT100 to host) is generated
by the VT100 as a DA control sequence with the numeric parameters
as follows:
<TABLE WIDTH="100%">
<COL WIDTH="50%">
<COL WIDTH="50%">
<THEAD>
<TR>
<TH>Option Present</TH>
<TH>Sequence Sent</TH>
</TR>
</THEAD>
<TBODY>
<TR>
<TD>No options</TD>
<TD><CODE>ESC [?1;0c</CODE></TD>
</TR>
<TR>
<TD>Processor option (STP)</TD>
<TD><CODE>ESC [?1;1c</CODE></TD>
</TR>
<TR>
<TD>Advanced video option (AVO)</TD>
<TD><CODE>ESC [?1;2c</CODE></TD>
</TR>
<TR>
<TD>AVO and STP</TD>
<TD><CODE>ESC [?1;3c</CODE></TD>
</TR>
<TR>
<TD>Graphics option (GPO)</TD>
<TD><CODE>ESC [?1;4c</CODE></TD>
</TR>
<TR>
<TD>GPO and STP</TD>
<TD><CODE>ESC [?1;5c</CODE></TD>
</TR>
<TR>
<TD>GPO and AVO</TD>
<TD><CODE>ESC [?1;6c</CODE></TD>
</TR>
<TR>
<TD>GPO, STP and AVO</TD>
<TD><CODE>ESC [?1;7c</CODE></TD>
</TR>
</TBODY>
</TABLE></LI>
</OL>
<H4 ID="DECALN"><SPAN CLASS="mnemonic">DECALN</SPAN> -- Screen Alignment Display (DEC Private)</H4>
<TABLE WIDTH="100%">
<TBODY>
<TR>
<TD><STRONG><CODE>ESC # 8</CODE></STRONG></TD>
<TD ALIGN="RIGHT">&nbsp;</TD>
</TR>
</TBODY>
</TABLE>
<P>This command fills the entire screen area with uppercase Es for screen focus and
alignment. This command is used by DEC manufacturing and Field Service personnel.</P>
<H4 ID="DECANM"><SPAN CLASS="mnemonic">DECANM</SPAN> -- ANSI/VT52 Mode (DEC Private)</H4>
<P>This is a private parameter applicable to set mode (SM) and reset mode (RM)
control sequences. The reset state causes only VT52 compatible escape sequences
to be interpreted and executed. The set state causes only ANSI "compatible"
escape and control sequences to be interpreted and executed.</P>
<H4 ID="DECARM"><SPAN CLASS="mnemonic">DECARM</SPAN> -- Auto Repeat Mode (DEC Private)</H4>
<P>This is a private parameter applicable to set mode (SM) and reset mode (RM)
control sequences. The reset state causes no keyboard keys to auto-repeat. The
set state causes certain keyboard keys to auto-repeat.</P>
<H4 ID="DECAWM"><SPAN CLASS="mnemonic">DECAWM</SPAN> -- Autowrap Mode (DEC Private)</H4>
<P>This is a private parameter applicable to set mode (SM) and reset mode (RM)
control sequences. The reset state causes any displayable characters received
when the cursor is at the right margin to replace any previous characters there. The
set state causes these characters to advance to the start of the next line, doing a
scroll up if required and permitted.</P>
<H4 ID="DECCKM"><SPAN CLASS="mnemonic">DECCKM</SPAN> -- Cursor Keys Mode (DEC Private)</H4>
<P>This is a private parameter applicable to set mode (SM) and reset mode (RM)
control sequences. This mode is only effective when the terminal is in keypad
application mode (see DECKPAM) and the ANSI/VT52 mode (DECANM) is set
(see DECANM). Under these conditions, if the cursor key mode is reset, the four
cursor function keys will send ANSI cursor control commands. If cursor key mode
is set, the four cursor function keys will send application functions.</P>
<H4 ID="DECCOLM"><SPAN CLASS="mnemonic">DECCOLM</SPAN> -- Column Mode (DEC Private)</H4>
<P>This is a private parameter applicable to set mode (SM) and reset mode (RM)
control sequences. The reset state causes a maximum of 80 columns on the
screen. The set state causes a maximum of 132 columns on the screen.</P>
<H4 ID="DECDHL"><SPAN CLASS="mnemonic">DECDHL</SPAN> -- Double Height Line (DEC Private)</H4>
<TABLE WIDTH="100%">
<TBODY>
<TR>
<TD>Top Half: <STRONG><CODE>ESC # 3</CODE></STRONG></TD>
<TD ALIGN="RIGHT">&nbsp;</TD>
</TR>
<TR>
<TD>Bottom Half: <STRONG><CODE>ESC # 4</CODE></STRONG></TD>
<TD ALIGN="RIGHT">&nbsp;</TD>
</TR>
</TBODY>
</TABLE>
<P>These sequences cause the line containing the active position to become the top
or bottom half of a double-height double-width line. The sequences must be used
in pairs on adjacent lines and the same character output must be sent to both lines
to form full double-height characters. If the line was single-width single-height, all
characters to the right of the center of the screen are lost. The cursor remains over
the same character position unless it would be to the right of the right margin, in
which case it is moved to the right margin.</P>
<P CLASS="note">NOTE: The use of double-width characters reduces the number of characters per line by half.</P>
<H4 ID="DECDWL"><SPAN CLASS="mnemonic">DECDWL</SPAN> -- Double-Width Line (DEC Private)</H4>
<TABLE WIDTH="100%">
<TBODY>
<TR>
<TD><STRONG><CODE>ESC # 6</CODE></STRONG></TD>
<TD ALIGN="RIGHT">&nbsp;</TD>
</TR>
</TBODY>
</TABLE>
<P>This causes the line that contains the active position to become double-width
single-height. If the line was single-width single-height, all characters to the right
of the screen are lost. The cursor remains over the same character position unless
it would be to the right of the right margin, in which case, it is moved to the right
margin.</P>
<P CLASS="note">NOTE: The use of double-width characters reduces the number of characters per line by half.</P>
<H4 ID="DECID"><SPAN CLASS="mnemonic">DECID</SPAN> -- Identify Terminal (DEC Private)</H4>
<TABLE WIDTH="100%">
<TBODY>
<TR>
<TD><STRONG><CODE>ESC Z</CODE></STRONG></TD>
<TD ALIGN="RIGHT">&nbsp;</TD>
</TR>
</TBODY>
</TABLE>
<P>This sequence causes the same response as the ANSI device attributes (DA). This
sequence will not be supported in future DEC terminals, therefore, DA should be
used by any new software.</P>
<H4 ID="DECINLM"><SPAN CLASS="mnemonic">DECINLM</SPAN> -- Interlace Mode (DEC Private)</H4>
<P>This is a private parameter applicable to set mode (SM) and reset mode (RM)
control sequences. The reset state (non-interlace) causes the video processor to
display 240 scan lines per frame. The set state (interlace) causes the video processor
to display 480 scan lines per frame. There is no increase in character resolution.</P>
<H4 ID="DECKPAM"><SPAN CLASS="mnemonic">DECKPAM</SPAN> -- Keypad Application Mode (DEC Private)</H4>
<TABLE WIDTH="100%">
<TBODY>
<TR>
<TD><STRONG><CODE>ESC =</CODE></STRONG></TD>
<TD ALIGN="RIGHT">&nbsp;</TD>
</TR>
</TBODY>
</TABLE>
<P>The auxiliary keypad keys will transmit control sequences as defined in Tables&nbsp;<A HREF="table3-7.html">3-7</A>
and <A HREF="table3-8.html">3-8</A>.</P>
<H4 ID="DECKPNM"><SPAN CLASS="mnemonic">DECKPNM</SPAN> -- Keypad Numeric Mode (DEC Private)</H4>
<TABLE WIDTH="100%">
<TBODY>
<TR>
<TD><STRONG><CODE>ESC &gt;</CODE></STRONG></TD>
<TD ALIGN="RIGHT">&nbsp;</TD>
</TR>
</TBODY>
</TABLE>
<P>The auxiliary keypad keys will send ASCII codes corresponding to the characters
engraved on the keys.</P>
<H4 ID="DECLL"><SPAN CLASS="mnemonic">DECLL</SPAN> -- Load LEDS (DEC Private)</H4>
<TABLE WIDTH="100%">
<TBODY>
<TR>
<TD><STRONG><CODE>ESC [ Ps q</CODE></STRONG></TD>
<TD ALIGN="RIGHT"><EM>default value:</EM> 0</TD>
</TR>
</TBODY>
</TABLE>
<P>Load the four programmable LEDs on the keyboard according to the parameter(s).</P>
<TABLE WIDTH="100%">
<COL WIDTH="30%">
<COL WIDTH="70%">
<THEAD>
<TR>
<TH>Parameter</TH>
<TH>Parameter Meaning</TH>
</TR>
</THEAD>
<TBODY>
<TR>
<TD>0</TD>
<TD>Clear LEDs L1 through L4</TD>
</TR>
<TR>
<TD>1</TD>
<TD>Light L1</TD>
</TR>
<TR>
<TD>2</TD>
<TD>Light L2</TD>
</TR>
<TR>
<TD>3</TD>
<TD>Light L3</TD>
</TR>
<TR>
<TD>4</TD>
<TD>Light L4</TD>
</TR>
</TBODY>
</TABLE>
<P>LED numbers are indicated on the keyboard.</P>
<H4 ID="DECOM"><SPAN CLASS="mnemonic">DECOM</SPAN> -- Origin Mode (DEC Private)</H4>
<P>This is a private parameter applicable to set mode (SM) and reset mode (RM)
control sequences. The reset state causes the origin to be at the upper-left character
position on the screen. Line and column numbers are, therefore, independent of
current margin settings. The cursor may be positioned outside the margins with a
cursor position (CUP) or horizontal and vertical position (HVP) control.</P>
<P>The set state causes the origin to be at the upper-left character position within the
margins. Line and column numbers are therefore relative to the current margin
settings. The cursor is not allowed to be positioned outside the margins.</P>
<P>The cursor is moved to the new home position when this mode is set or reset.</P>
<P>Lines and columns are numbered consecutively, with the origin being line 1, column
1.</P>
<H4 ID="DECRC"><SPAN CLASS="mnemonic">DECRC</SPAN> -- Restore Cursor (DEC Private)</H4>
<TABLE WIDTH="100%">
<TBODY>