<!doctype html public "-//w3c//dtd html 4.0 transitional//en"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <title>Square Bracket Characters</title> <link HREF="http://www.w3.org/StyleSheets/Core/Steely" TYPE="text/css" REL="stylesheet"> </head> <body> <h1> Square Bracket Characters</h1> <h2> The Problem</h2> Most IBM 3270 emulators have some degree of difficulty with the square-bracket characters, <b>[</b> and <b>]</b>. The problem is that there is not a consistent definition of what EBCDIC codes represent them. Hosts may define the square bracket characters as X'BA' and X'BB' (as defined in the IBM <i>Chararcter Set Reference</i> as standard EBCDIC characters), or as X'AD' and X'BD' (which is what the IBM C compilers recognize). In addition, some (but not all) hosts display these characters with a Graphics Escape (GE) sequence. When the host and/or x3270 are misconfigured, the square-bracket characters may be displayed as <img SRC="del.jpg" height=23 width=24> and <img SRC="delta.jpg" height=21 width=20>, or <b>Ý</b> and <b>¨</b>. <h2> Host Configuration</h2> If you are using ISPF, you may simply need to use the correct terminal translation table. According to the IBM's <i>ISPF Planning and Customizing (SC28-1298)</i>, Section 3.11, the correct translation table for displaying square bracket characters is called <b>3278A</b>. <p>In VM/CMS, the commands <b>terminal apl on</b> and <b>set apl on</b> cause the X'AD', X'BD', X'BA' and X'BB' characters to be displayed with a Graphics Escape (GE) prefix. With <b>terminal apl off</b> and <b>set apl off</b> in effect, they are displayed without the GE prefix. <h2> x3270 Facilities</h2> x3270 has two facilities to deal with this situation: character sets and keymaps. By selecting the correct character set and keymap, you can set up x3270 to generate and display the proper codes for the square-bracket characters. <blockquote><b>-charset bracket</b> is the default mode, and is used with hosts that use X'AD' and X'BD' for the square-bracket characters. It can be used if the host displays these characters with or without a GE sequence.</blockquote> <blockquote><b>-charset us</b> is for use with hosts that use X'BA' and X'BB' for the square-bracket characters, and <i>do not</i> display these characters with a GE sequence.</blockquote> <blockquote><b>-apl</b> (an abbreviation for <b>-charset apl</b>, <b>-keymap apl</b>) is for use with hosts running APL, which use GE X'AD' and GE X'BD' to represent and display the APL2 square-bracket characters.</blockquote> Here is a table which summarizes the combinations of characters generated and displayed in the various modes. <br> <center><table BORDER COLS=11 WIDTH="100%" > <tr> <td><i> </i></td> <td COLSPAN="2"> <center><i>keyboard generates</i></center> </td> <td COLSPAN="8"> <center><i>graphic displayed for EBCDIC codes</i></center> </td> </tr> <tr> <td><i>x3270 Mode</i></td> <td> <center><i>[ key</i></center> </td> <td> <center><i>] key</i></center> </td> <td> <center>X'AD'</center> </td> <td> <center>X'BD'</center> </td> <td> <center>X'BA'</center> </td> <td> <center>X'BB'</center> </td> <td> <center>GE X'BA'</center> </td> <td> <center>GE X'BB'</center> </td> <td> <center>GE X'AD'</center> </td> <td> <center>GE X'BD'</center> </td> </tr> <tr> <td><b>-charset</b> <b>bracket</b> (default)</td> <td ALIGN=CENTER>X'AD'</td> <td> <center>X'BD'</center> </td> <td> <center><b>[</b></center> </td> <td> <center><b>]</b></center> </td> <td> <center><b>Ý</b></center> </td> <td> <center><b>¨</b></center> </td> <td ROWSPAN="3"> <center><img SRC="del.jpg" height=23 width=24></center> </td> <td ROWSPAN="3"> <center><img SRC="delta.jpg" height=21 width=20></center> </td> <td ROWSPAN="3"> <center><b>[</b></center> </td> <td ROWSPAN="3"> <center><b>]</b></center> </td> </tr> <tr> <td><b>-charset</b> <b>us</b></td> <td> <center>X'BA'</center> </td> <td> <center>X'BB'</center> </td> <td ROWSPAN="2"> <center><b>Ý</b></center> </td> <td ROWSPAN="2"> <center><b>¨</b></center> </td> <td ROWSPAN="2"> <center><b>[</b></center> </td> <td ROWSPAN="2"> <center><b>]</b></center> </td> </tr> <tr> <td><b>-apl</b></td> <td> <center>GE X'AD'</center> </td> <td> <center>GE X'BD'</center> </td> </tr> </table></center> </body> </html>
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