diff --git a/src/emucore/ControllerDetector.cxx b/src/emucore/ControllerDetector.cxx
index 95922051b..622f59ca1 100644
--- a/src/emucore/ControllerDetector.cxx
+++ b/src/emucore/ControllerDetector.cxx
@@ -121,7 +121,7 @@ bool ControllerDetector::usesJoystickButton(const ByteBuffer& image, size_t size
   if(port == Controller::Jack::Left)
   {
     // check for INPT4 access
-    const int NUM_SIGS_0 = 23;
+    const int NUM_SIGS_0 = 24;
     const int SIG_SIZE_0 = 3;
     uInt8 signature_0[NUM_SIGS_0][SIG_SIZE_0] = {
       { 0x24, 0x0c, 0x10 }, // bit INPT4; bpl (joystick games only)
@@ -139,6 +139,7 @@ bool ControllerDetector::usesJoystickButton(const ByteBuffer& image, size_t size
       { 0xb4, 0x0c, 0x30 }, // ldy INPT4|$30,x; bmi (joystick games only)
       { 0xa5, 0x3c, 0x2a }, // ldy INPT4|$30; rol (joystick games only)
       { 0xa6, 0x3c, 0x8e }, // ldx INPT4|$30; stx (joystick games only)
+      { 0xa6, 0x0c, 0x8e }, // ldx INPT4; stx (joystick games only)
       { 0xa4, 0x3c, 0x8c }, // ldy INPT4; sty (joystick games only, Scramble)
       { 0xa5, 0x0c, 0x8d }, // lda INPT4; sta (joystick games only, Super Cobra Arcade)
       { 0xa4, 0x0c, 0x30 }, // ldy INPT4|; bmi (only Game of Concentration)
@@ -392,7 +393,7 @@ bool ControllerDetector::usesGenesisButton(const ByteBuffer& image, size_t size,
   if(port == Controller::Jack::Left)
   {
     // check for INPT1 access
-    const int NUM_SIGS_0 = 18;
+    const int NUM_SIGS_0 = 19;
     const int SIG_SIZE_0 = 3;
     uInt8 signature_0[NUM_SIGS_0][SIG_SIZE_0] = {
       { 0x24, 0x09, 0x10 }, // bit INPT1; bpl (Genesis only)
@@ -408,6 +409,7 @@ bool ControllerDetector::usesGenesisButton(const ByteBuffer& image, size_t size,
       { 0xa4, 0x39, 0x30 }, // ldy INPT1|$30; bmi (keyboard ROMS too)
       { 0xa5, 0x39, 0x6a }, // lda INPT1|$30; ror (Genesis only)
       { 0xa6, 0x39, 0x8e }, // ldx INPT1|$30; stx (Genesis only)
+      { 0xa6, 0x09, 0x8e }, // ldx INPT1; stx (Genesis only)
       { 0xa4, 0x39, 0x8c }, // ldy INPT1|$30; sty (Genesis only, Scramble)
       { 0xa5, 0x09, 0x8d }, // lda INPT1; sta (Genesis only, Super Cobra Arcade)
       { 0xa5, 0x09, 0x29 }, // lda INPT1; and (Genesis only)