diff --git a/src/emucore/ControllerDetector.cxx b/src/emucore/ControllerDetector.cxx
index 023302d81..6609340df 100644
--- a/src/emucore/ControllerDetector.cxx
+++ b/src/emucore/ControllerDetector.cxx
@@ -314,13 +314,14 @@ bool ControllerDetector::usesKeyboard(const uInt8* image, size_t size,
   else if(port == Controller::Jack::Right)
   {
     // check for INPT2 *AND* INPT3 access
-    const int NUM_SIGS_0_0 = 5;
+    const int NUM_SIGS_0_0 = 6;
     const int SIG_SIZE_0_0 = 3;
     uInt8 signature_0_0[NUM_SIGS_0_0][SIG_SIZE_0_0] = {
       { 0x24, 0x3a, 0x30 }, // bit INPT2|$30; bmi
       { 0xa5, 0x3a, 0x10 }, // lda INPT2|$30; bpl
       { 0xa4, 0x3a, 0x30 }, // ldy INPT2|$30; bmi
       { 0x24, 0x0a, 0x30 }, // bit INPT2; bmi
+      { 0x24, 0x0a, 0x10 }, // bit INPT2; bpl
       { 0xa6, 0x0a, 0x30 }  // ldx INPT2; bmi
     };
     const int NUM_SIGS_0_2 = 1;
@@ -329,13 +330,14 @@ bool ControllerDetector::usesKeyboard(const uInt8* image, size_t size,
       { 0xb5, 0x38, 0x29, 0x80, 0xd0 }  // lda INPT2,x; and #80; bne
     };
 
-    const int NUM_SIGS_1_0 = 5;
+    const int NUM_SIGS_1_0 = 6;
     const int SIG_SIZE_1_0 = 3;
     uInt8 signature_1_0[NUM_SIGS_1_0][SIG_SIZE_1_0] = {
       { 0x24, 0x3b, 0x30 }, // bit INPT3|$30; bmi
       { 0xa5, 0x3b, 0x10 }, // lda INPT3|$30; bpl
       { 0xa4, 0x3b, 0x30 }, // ldy INPT3|$30; bmi
       { 0x24, 0x0b, 0x30 }, // bit INPT3; bmi
+      { 0x24, 0x0b, 0x10 }, // bit INPT3; bpl
       { 0xa6, 0x0b, 0x30 }  // ldx INPT3; bmi
     };
     const int NUM_SIGS_1_2 = 1;