-.\" $Id: terminfo.tail,v 1.85 2017/04/22 18:59:02 tom Exp $
+.\" $Id: terminfo.tail,v 1.87 2017/05/05 17:54:07 tom Exp $
.\" Beginning of terminfo.tail file
.\" This file is part of ncurses.
.\" See "terminfo.head" for copyright.
.SS Line Graphics
.PP
Many terminals have alternate character sets useful for forms-drawing.
-Terminfo and \fBcurses\fR built-in support for the drawing characters
+Terminfo and \fBcurses\fR have built-in support
+for most of the drawing characters
supported by the VT100, with some characters from the AT&T 4410v1 added.
This alternate character set may be specified by the \fBacsc\fR capability.
.PP
_ _ _ _ _
lw25 lw10 lw6 lw6 lw6.
.\".TH
-\fBGlyph ACS Ascii VT100 VT100\fR
-\fBName Name Default Char Code\fR
+\fBGlyph ACS Ascii acsc acsc\fR
+\fBName Name Default Char Value\fR
arrow pointing right ACS_RARROW > + 0x2b
arrow pointing left ACS_LARROW < , 0x2c
arrow pointing up ACS_UARROW ^ \- 0x2d
.bP
The DEC VT100 implemented graphics using the alternate character set
feature, temporarily switching \fImodes\fP and sending characters
-in the range 0x60 (96) to 0x7e (126).
+in the range 0x60 (96) to 0x7e (126)
+(the \fBacsc Value\fP column in the table).
.bP
The AT&T terminal added graphics characters outside that range.
+.IP
+Some of the characters within the range do not match the VT100;
+presumably they were used in the AT&T terminal:
+\fIboard of squares\fP replaces the VT100 \fInewline\fP symbol, while
+\fIlantern symbol\fP replaces the VT100 \fIvertical tab\fP symbol.
+The other VT100 symbols for control characters (\fIhorizontal tab\fP,
+\fIcarriage return\fP and \fIline-feed\fP) are not (re)used in curses.
.PP
The best way to define a new device's graphics set is to add a column
to a copy of this table for your terminal, giving the character which