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<h2 id="sec45" class="section">20 Miscellaneous</h2>
<h3 id="sec46" class="subsection">20.1 Abort Character</h3>
<p>
The abort character (<span style="font-variant:small-caps">Ctrl-G</span> by default) is special and should not be
rebound. On the IBMPC, the keyboard interrupt 0x09 is hooked and a quit
condition is signaled when it is pressed. For this reason, it should not
be used in any keybindings. A similar statement holds for the other
systems.</p><p>This character may be changed using the function <code class="verb">set_abort_char</code>
Using this function affects all keymaps. For example, putting the line
</p><pre class="verbatim"> set_abort_char (30);
</pre><p>
in your <code class="verb">jed.rc</code> file will change the abort character from its
current value to 30 which is <span style="font-variant:small-caps">Ctrl-</span><code class="verb">^</code>.</p>
<h3 id="sec47" class="subsection">20.2 Input Translation</h3>
<p>By using the function <code class="verb">map_input</code> the user is able to remap
characters input from the terminal before <span style="font-weight:bold">jed</span>’s keymap routines have a
chance to act upon them. This is useful when it is difficult to get <span style="font-weight:bold">jed</span>
to see certain characters. For example, consider the <span style="font-variant:small-caps">Ctrl-S</span>
character. This character is especially notorious because many systems
use it and <span style="font-variant:small-caps">Ctrl-Q</span> for flow control. Nevertheless Emacs uses
<span style="font-variant:small-caps">Ctrl-S</span> for searching. Short of rebinding all keys which involve a
<span style="font-variant:small-caps">Ctrl-S</span> how does one work with functions that are bound to key
sequences using <span style="font-variant:small-caps">Ctrl-S</span>? This is where <code class="verb">map_input</code> comes into
play. The <code class="verb">map_input</code> function requires two integer arguments which
define how a given ascii character is to be mapped. Suppose that you wish
to substitute <span style="font-variant:small-caps">Ctrl-</span><code class="verb">\</code> for <span style="font-variant:small-caps">Ctrl-S</span> everywhere. The line
</p><pre class="verbatim"> map_input (28, 19);
</pre><p>
will do the trick. Here 28 is the ascii character of <span style="font-variant:small-caps">Ctrl-</span><code class="verb">\</code>
and 19 is the ascii character for the <span style="font-variant:small-caps">Ctrl-S</span>.</p><p>As another example, consider the case where the backspace key sends out a
<span style="font-variant:small-caps">Ctrl-H</span> instead of the <span style="font-variant:small-caps">DEL</span> character (<span style="font-variant:small-caps">Ctrl-?</span>).
</p><pre class="verbatim"> map_input (8, 127);
</pre><p>
will map the <span style="font-variant:small-caps">Ctrl-H</span> (ascii 8) to the delete character (ascii 127).</p>
<h3 id="sec48" class="subsection">20.3 Display Sizes</h3>
<p>On VMS and unix systems, the screen size may be changed to either 80 or
132 columns by using the functions <code class="verb">w80</code> and <code class="verb">w132</code>
respectively. Simply enter the appropriate function name at the <code class="verb">M-x</code>
prompt in the minibuffer. The default binding for access to the
minibuffer is <span style="font-variant:small-caps">Esc X</span>. Most window systems, e.g., DECWindows, allow
the window size to be changed. When this is done, <span style="font-weight:bold">jed</span> should
automatically adapt to the new size.</p><p>On the PC, at this time the screen size cannot be changed while <span style="font-weight:bold">jed</span> is
running. Instead it is necessary to exit <span style="font-weight:bold">jed</span> first then set the display
size and rerun <span style="font-weight:bold">jed</span>.</p><hr>
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