Improve play/pause and PC display for stopped CPUs.

nelhage · Jun 4, 2011 · 59ad2f6 · 59ad2f6
1 parent 06b823d
commit 59ad2f6
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Showing 2 changed files with 19 additions and 13 deletions.
diff --git a/beta.html b/beta.html
@@ -22,7 +22,7 @@
       <div id='controls'>
         <div id='cpucontrol'>
           <input id='resetbutton' type="button" value="reset" onclick='resetBeta();'/>
-          <input id='playplausebutton' type="button" value="run" onclick='playPauseBeta();'/>
+          <input id='playpausebutton' type="button" value="run" onclick='playPauseBeta();'/>
         </div>
         <div id='romcontrol'>
           Load ROM:

diff --git a/betaweb.js b/betaweb.js
@@ -98,30 +98,36 @@ function resetBeta(rom) {
                },
                halt: function() {
                    betaTerm.type("--- Program terminated ----");
+                   refreshDisplay();
                }});
     playPauseBeta();
 }
 
 function playPauseBeta() {
-    var button = document.getElementById('playplausebutton');
-    if (!button)
-        return;
-    if(CPU.running()) {
+    if(CPU.running())
         CPU.pause();
-        button.value="run";
-    } else {
+    else
         CPU.run();
-        button.value="pause";
-    }
     refreshDisplay();
 }
 
 function refreshDisplay() {
     var div = document.getElementById('pcval');
-    if (CPU.running())
-        div.textContent = "<running>";
-    else
-        div.textContent = toHex(CPU.PC);
+    var button = document.getElementById('playpausebutton');
+
+    if (CPU.halt) {
+        div.textContent = "<stopped>";
+        button.disabled = true;
+    } else {
+        button.disabled = false;
+        if (CPU.running()) {
+            div.textContent = "<running>";
+            button.value = "pause";
+        } else {
+            div.textContent = toHex(CPU.PC);
+            button.value = "run";
+        }
+    }
 }
 
 function initTerm() {