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ESEO-Tech · Aug 27, 2020 · 6af8b36 · 6af8b36
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diff --git a/doc/index.html b/doc/index.html
@@ -463,19 +463,24 @@ <h3 id="gpio">General-purpose input/output</h3>
 
 <ul>
     <li>Push-buttons.</li>
-    <li>Switches.</li>
+    <li>Toggle switches.</li>
     <li>LEDs.</li>
 </ul>
 
+<p>The inputs are arranged in an 8&times;4 grid at the bottom of the
+<em>General-purpose I/O</em> section of the simulator.
+Right-click on a cell to change its type.
+Left-click to change the state of a button or switch.</p>
+
 <p>It has the following 32-bit registers:</p>
 
 <table>
     <tr><th>Address (hex)</th> <th>Role</th> <th>Value</th></tr>
-    <tr><td style="text-align:center;"><code>D0000000</code></td> <td>Direction</td> <td>The configuration of each pin (0 for an output, 1 for an input).</td></tr>
-    <tr><td style="text-align:center;"><code>D0000004</code></td> <td>Interrupt enable</td> <td>Enable interrupts on input events.</td></tr>
-    <tr><td style="text-align:center;"><code>D0000008</code></td> <td>Rising-edge events</td> <td>Each bit is set to 1 if the corresponding input pin has changed from 0 to 1.</td></tr>
-    <tr><td style="text-align:center;"><code>D000000C</code></td> <td>Falling-edge events</td> <td>Each bit is set to 1 if the corresponding input pin has changed from 1 to 0.</td></tr>
-    <tr><td style="text-align:center;"><code>D0000010</code></td> <td>Data</td> <td>The current value of each input or output.</td></tr>
+    <tr><td style="text-align:center;"><code>D0000000</code></td> <td>Direction (dir)</td> <td>The configuration of each pin (0 for an output, 1 for an input).</td></tr>
+    <tr><td style="text-align:center;"><code>D0000004</code></td> <td>Interrupt enable (ien)</td> <td>Enable interrupts on input events.</td></tr>
+    <tr><td style="text-align:center;"><code>D0000008</code></td> <td>Rising-edge events (rev)</td> <td>Each bit is set to 1 if the corresponding input pin has changed from 0 to 1.</td></tr>
+    <tr><td style="text-align:center;"><code>D000000C</code></td> <td>Falling-edge events (fev)</td> <td>Each bit is set to 1 if the corresponding input pin has changed from 1 to 0.</td></tr>
+    <tr><td style="text-align:center;"><code>D0000010</code></td> <td>Value (val)</td> <td>The current value of each input or output.</td></tr>
 </table>
 
 <p>On reset, all pins are configured as outputs and interrupts are disabled.</p>

diff --git a/index.html b/index.html
@@ -195,28 +195,28 @@ <h1>General-purpose I/O</h1>
                 <td class="reg" id="memd0000003"></td>
             </tr>
             <tr>
-                <th>d0000004 (int)</th>
+                <th>d0000004 (ien)</th>
                 <td class="reg" id="memd0000004"></td>
                 <td class="reg" id="memd0000005"></td>
                 <td class="reg" id="memd0000006"></td>
                 <td class="reg" id="memd0000007"></td>
             </tr>
             <tr>
-                <th>d0000008 (re)</th>
+                <th>d0000008 (rev)</th>
                 <td class="reg" id="memd0000008"></td>
                 <td class="reg" id="memd0000009"></td>
                 <td class="reg" id="memd000000a"></td>
                 <td class="reg" id="memd000000b"></td>
             </tr>
             <tr>
-                <th>d000000c (fe)</th>
+                <th>d000000c (fev)</th>
                 <td class="reg" id="memd000000c"></td>
                 <td class="reg" id="memd000000d"></td>
                 <td class="reg" id="memd000000e"></td>
                 <td class="reg" id="memd000000f"></td>
             </tr>
             <tr>
-                <th>d0000010 (data)</th>
+                <th>d0000010 (val)</th>
                 <td class="reg" id="memd0000010"></td>
                 <td class="reg" id="memd0000011"></td>
                 <td class="reg" id="memd0000012"></td>