diff --git a/index.html b/index.html
index 7ca3887..3f75a7c 100644
--- a/index.html
+++ b/index.html
@@ -69,7 +69,7 @@
       <input type="button" value="LOAD DATA" onclick="loadData();">
     </p>
     <pre class="comments">
-Examples - binary data of simple programs:
+Examples - binary data of some tiny programs:
 db ff d3 ff c3 00 00       // Switch echo between A2 and A1.
 3e 8c d3 ff 0f c3 02 00    // Pattern shift.</pre>
 
@@ -264,6 +264,14 @@ db ff d3 ff c3 00 00       // Switch echo between A2 and A1.
      function examineNext() {
        sim.examineNext();
      }
+
+     function deposit() {
+       sim.deposit();
+     }
+
+     function depositNext() {
+       sim.depositNext();
+     }
     </script>
   </body>
 </html>
diff --git a/js/sim8800.js b/js/sim8800.js
index d3b7103..ac25b68 100644
--- a/js/sim8800.js
+++ b/js/sim8800.js
@@ -418,4 +418,29 @@ class Sim8800 {
         this.lastAddress++;
         this.showAddressAndData();
     }
+
+    /**
+     * Writes a byte to the given address.
+     */
+    deposit() {
+        if (!this.isPoweredOn)
+            return;
+        if (this.getInputAddressCallback) {
+            // Only 8 bits of input is considered.
+            var value = this.getInputAddressCallback() & 0xff;
+            this.getWriteByteCallback()(this.lastAddress, value);
+            this.showAddressAndData();
+            this.dumpMem();
+        }
+    }
+
+    /**
+     * Writes a byte to the next address.
+     */
+    depositNext() {
+        if (!this.isPoweredOn)
+            return;
+        this.lastAddress++;
+        this.deposit();
+    }
 };