added docs for TM playback

Changes.txt

@@ -14,15 +14,14 @@
 
 6.2.1 to 6.3 (XXXX XX, 2020)
 
-  * Fix bug when taking fullscreen snapshots; the dimensions were sometimes
-    cut off.
-
   * Added autofire.
 
   * Added new interface palette 'Dark'. (TODO: DOC)
 
   * Extended global hotkeys for debug options.
 
+  * Added option to playback a game using the Time Machine
+
   * Allow taking snapshots from within Time Machine dialog
 
   * Added ability to access most files that Stella uses from within a ZIP
@@ -36,6 +35,9 @@
 
   * Replaced "Re-disassemble" with "Disassemble @ current line" in debugger
 
+  * Fix bug when taking fullscreen snapshots; the dimensions were sometimes
+    cut off.
+
 -Have fun!
 
 

docs/index.html

@@ -1819,6 +1819,11 @@
       <td>Shift + t to enter, Shift + t/Escape/Space to exit and continue with emulation</td>
       <td>Shift + t to enter, Shift + t/Escape/Space to exit and continue with emulation</td>
     </tr>
+    <tr>
+      <td>Playback the <a href="#TimeMachine"><b>Time Machine</b></a> from current state (without sound).</td>
+      <td>Shift + Space</td>
+      <td>Shift + Space</td>
+    </tr>
     <tr>
       <td>Rewind by one state (enters the <a href="#TimeMachine"><b>Time Machine</b></a> dialog)</td>
       <td>Alt + Left arrow</td>
@@ -2027,12 +2032,13 @@
   <p><b>Bottom row (left to right)</b></p>
   <table border="1" cellpadding="4">
     <tr><th>Item</th><th>Description</th></tr>
-    <tr><td>Current time</td><td>Shows the time of the currently selected status,
+    <tr><td>Current time</td><td>Shows the time of the currently selected state,
       relative to the first one</td></tr>
     <tr><td>'Start/Stop' button</td><td>Starts or stops the Time Machine</td></tr>
-    <tr><td>'Continue' button</td><td>Exits the dialog and continues emulation</td></tr>
+    <tr><td>'Exit' button</td><td>Exits the dialog and continues emulation, starting at current state</td></tr>
     <tr><td>'Rewind All' button</td><td>Navigates back to the begin of the timeline</td></tr>
     <tr><td>'Rewind One' button</td><td>Navigates back by one state</td></tr>
+    <tr><td>'Playback' button</td><td>Starts playback, starting at the current state (with sound disabled)</td></tr>
     <tr><td>'Unwind One' button</td><td>Navigates forward by one state</td></tr>
     <tr><td>'Unwind All' button</td><td>Navigates forward to the end of the timeline</td></tr>
     <tr><td>'Save All' button</td><td>Saves all Time Machine states to disk</td></tr>