diff --git a/docs/index.html b/docs/index.html
index 4efd03786..881857902 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -1278,17 +1278,17 @@
     <tr><td>Shift </td><td>Shift (left or right) </td></tr>
     <tr><td>Enter </td><td>Return/Enter </td></tr>
     <tr><td>Space </td><td>Space </td></tr>
-    <tr><td>Func-Space </td><td>Backspace </td></tr>
-    <tr><td>+ </td><td>+ or Shift-1 </td></tr>
-    <tr><td>- </td><td>- or Shift-2</td></tr>
-    <tr><td>* </td><td>Shift-3 </td></tr>
-    <tr><td>/ </td><td>/ or Shift-4 </td></tr>
-    <tr><td>= </td><td>= or Shift-5 </td></tr>
-    <tr><td>? </td><td>? (Shift-/) or Shift-6 </td></tr>
-    <tr><td>$ </td><td>Shift-7 </td></tr>
-    <tr><td>[ </td><td>[ or Shift-8 </td></tr>
-    <tr><td>] </td><td>] or Shift-9 </td></tr>
-    <tr><td>&quot; </td><td>" (Shift-') or Shift-0 </td></tr>
+    <tr><td>Func-Space </td><td>Shift + Backspace </td></tr>
+    <tr><td>+ </td><td>+ or Shift + 1 </td></tr>
+    <tr><td>- </td><td>- or Shift + 2</td></tr>
+    <tr><td>* </td><td>Shift + 3 </td></tr>
+    <tr><td>/ </td><td>/ or Shift + 4 </td></tr>
+    <tr><td>= </td><td>= or Shift + 5 </td></tr>
+    <tr><td>? </td><td>? (Shift + /) or Shift + 6 </td></tr>
+    <tr><td>$ </td><td>Shift + 7 </td></tr>
+    <tr><td>[ </td><td>[ or Shift + 8 </td></tr>
+    <tr><td>] </td><td>] or Shift + 9 </td></tr>
+    <tr><td>&quot; </td><td>" (Shift + ') or Shift + 0 </td></tr>
 
   </table>
 
diff --git a/src/common/PKeyboardHandler.cxx b/src/common/PKeyboardHandler.cxx
index 4b0343984..26ae73942 100644
--- a/src/common/PKeyboardHandler.cxx
+++ b/src/common/PKeyboardHandler.cxx
@@ -413,12 +413,9 @@ PhysicalKeyboardHandler::EventMappingArray PhysicalKeyboardHandler::DefaultCommo
   {Event::ConsoleSelect,            KBDK_F1},
   {Event::ConsoleReset,             KBDK_F2},
   {Event::ConsoleColor,             KBDK_F3},
-  {Event::ConsoleBlackWhite,        KBDK_F4},
   {Event::Console7800Pause,         KBDK_F3, MOD3},
   {Event::ConsoleLeftDiffA,         KBDK_F5},
-  {Event::ConsoleLeftDiffB,         KBDK_F6},
   {Event::ConsoleRightDiffA,        KBDK_F7},
-  {Event::ConsoleRightDiffB,        KBDK_F8},
   {Event::SaveState,                KBDK_F9},
   {Event::SaveAllStates,            KBDK_F9, MOD3},
   {Event::PreviousState,            KBDK_F10, KBDM_SHIFT},
@@ -427,7 +424,6 @@ PhysicalKeyboardHandler::EventMappingArray PhysicalKeyboardHandler::DefaultCommo
   {Event::LoadState,                KBDK_F11},
   {Event::LoadAllStates,            KBDK_F11, MOD3},
   {Event::TakeSnapshot,             KBDK_F12},
-  {Event::Fry,                      KBDK_BACKSPACE},
   {Event::TogglePauseMode,          KBDK_PAUSE},
   {Event::OptionsMenuMode,          KBDK_TAB},
   {Event::CmdMenuMode,              KBDK_BACKSLASH},
@@ -516,6 +512,11 @@ PhysicalKeyboardHandler::EventMappingArray PhysicalKeyboardHandler::DefaultCommo
   {Event::ConsoleRightDiffToggle,   KBDK_F8},         // front ("SKILL P2")
   {Event::CmdMenuMode,              KBDK_F13},        // back ("4:3","16:9")
   {Event::ExitMode,                 KBDK_BACKSPACE},  // back ("FRY")
+#else // defining duplicate keys must be avoided!
+  {Event::ConsoleBlackWhite,        KBDK_F4},
+  {Event::ConsoleLeftDiffB,         KBDK_F6},
+  {Event::ConsoleRightDiffB,        KBDK_F8},
+  {Event::Fry,                      KBDK_BACKSPACE},
 #endif
 };
 
@@ -550,7 +551,6 @@ PhysicalKeyboardHandler::EventMappingArray PhysicalKeyboardHandler::DefaultMenuM
   {Event::UITabPrev,                KBDK_TAB, KBDM_SHIFT | KBDM_CTRL},
   {Event::UITabNext,                KBDK_TAB, KBDM_CTRL},
 
-  {Event::UIPrevDir,                KBDK_BACKSPACE},
   {Event::ToggleFullScreen,         KBDK_RETURN, MOD3},
 
 #ifdef BSPF_MACOS
@@ -569,6 +569,8 @@ PhysicalKeyboardHandler::EventMappingArray PhysicalKeyboardHandler::DefaultMenuM
   //{Event::NoType,                   KBDK_F4},         // back ("COLOR","B/W")
   {Event::UITabPrev,                KBDK_F13},        // back ("4:3","16:9")
   {Event::UITabNext,                KBDK_BACKSPACE},  // back (FRY)
+#else // defining duplicate keys must be avoided!
+  {Event::UIPrevDir,                KBDK_BACKSPACE},
 #endif
 };
 
@@ -704,7 +706,7 @@ PhysicalKeyboardHandler::EventMappingArray PhysicalKeyboardHandler::CompuMateMap
   {Event::CompuMateRightBracket,  KBDK_RIGHTBRACKET},
   {Event::CompuMateMinus,         KBDK_MINUS},
   {Event::CompuMateQuote,         KBDK_APOSTROPHE, KBDM_SHIFT},
-  {Event::CompuMateBackspace,     KBDK_BACKSPACE},
+  {Event::CompuMateBackspace,     KBDK_BACKSPACE, KBDM_SHIFT},
   {Event::CompuMateEquals,        KBDK_EQUALS},
   {Event::CompuMatePlus,          KBDK_EQUALS, KBDM_SHIFT},
   {Event::CompuMateSlash,         KBDK_SLASH}