prevent more button pushes before first loadROM(); use latest version menu item

css/ui.css

@@ -539,3 +539,6 @@ div.asset_toolbar {
 .control-def {
   color: #ccc;
 }
+.book-title {
+  font-size:14pt;
+}

index.html

@@ -159,6 +159,9 @@ if (window.location.host.endsWith('8bitworkshop.com')) {
           </li>
         </ul>
       </li>
+      <!--
+      <hr><li><a class="dropdown-item" href="/redir.html">Use Latest Version</a></li>
+      -->
     </ul>
   </span>
 
@@ -188,19 +191,19 @@ if (window.location.host.endsWith('8bitworkshop.com')) {
       <li>
         <a class="dropdown-item dropdown-link" target="_book_a2600" href="https://www.amazon.com/gp/product/1541021304/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&tag=pzp-20&camp=1789&creative=9325&linkCode=as2&creativeASIN=B01N4DSRIZ&linkId=04d39e274c06e6c93b93d20a9a977111">
           <img src="images/book_a2600.png"/>
-          &nbsp;&nbsp;<b>Making Games For The Atari 2600</b>
+          &nbsp;&nbsp;<span class="book-title">Making Games For The Atari 2600</span>
         </a>
       </li>
       <li>
         <a class="dropdown-item dropdown-link" target="_book_arcade" href="https://www.amazon.com/gp/product/1545484759/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=1545484759&linkCode=as2&tag=pzp-20&linkId=b27709c022d2ebe639e90316d9f4fd5b">
           <img src="images/book_arcade.png"/>
-          &nbsp;&nbsp;<b>Making 8-bit Arcade Games in C</b>
+          &nbsp;&nbsp;<span class="book-title">Making 8-bit Arcade Games in C</span>
         </a>
       </li>
       <li>
         <a class="dropdown-item dropdown-link" target="_book_verilog" href="https://www.amazon.com/gp/product/1728619440/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=1728619440&linkCode=as2&tag=pzp-20">
           <img src="images/book_verilog.png"/>
-          &nbsp;&nbsp;<b>Designing Video Game Hardware in Verilog</b>
+          &nbsp;&nbsp;<span class="book-title">Designing Video Game Hardware in Verilog</span>
         </a>
       </li>
     </ul>

src/ui.ts

@@ -1003,7 +1003,7 @@ function setDebugButtonState(btnid:string, btnstate:string) {
 
 function checkRunReady() {
   if (current_output == null) {
-    alertError("Can't resume emulation until ROM is successfully built.");
+    alertError("Can't do this until build successfully completes.");
     return false;
   } else
     return true;
@@ -1070,11 +1070,13 @@ function togglePause() {
 }
 
 function singleStep() {
+  if (!checkRunReady()) return;
   setupBreakpoint("step");
   platform.step();
 }
 
 function singleFrameStep() {
+  if (!checkRunReady()) return;
   setupBreakpoint("tovsync");
   platform.runToVsync();
 }
@@ -1101,11 +1103,13 @@ function runToCursor() {
 }
 
 function runUntilReturn() {
+  if (!checkRunReady()) return;
   setupBreakpoint("stepout");
   platform.runUntilReturn();
 }
 
 function runStepBackwards() {
+  if (!checkRunReady()) return;
   setupBreakpoint("stepback");
   platform.stepBack();
 }
@@ -1118,6 +1122,7 @@ function clearBreakpoint() {
 }
 
 function resetAndDebug() {
+  if (!checkRunReady()) return;
   _disableRecording();
   if (platform.setupDebug && platform.readAddress) { // TODO??
     clearBreakpoint();