diff --git a/src/huc6280.cpp b/src/huc6280.cpp
index ef4292c..26fe786 100644
--- a/src/huc6280.cpp
+++ b/src/huc6280.cpp
@@ -123,7 +123,7 @@ unsigned int HuC6280::Tick()
 
     m_t_states += k_opcode_tstates[opcode];
     m_t_states += m_page_crossed ? k_opcode_tstates_cross_paged[opcode] : 0;
-    m_t_states += m_branch_taken ? 1 : 0;
+    m_t_states += m_branch_taken ? 2 : 0;
 
     return m_t_states;
 }
diff --git a/src/huc6280_opcodes.cpp b/src/huc6280_opcodes.cpp
index 65bee87..ba10764 100644
--- a/src/huc6280_opcodes.cpp
+++ b/src/huc6280_opcodes.cpp
@@ -122,9 +122,9 @@ void HuC6280::OPCode0x0E()
 
 void HuC6280::OPCode0x0F()
 {
-    // UNOFFICIAL
-    // SLO $nn
-    UnofficialOPCode();
+    // OK
+    // BBR0 ZZ,hhll
+    OPcodes_Branch(!IsSetBit(0, m_memory->Read(ZeroPageAddressing())));
 }
 
 void HuC6280::OPCode0x10()
@@ -228,9 +228,9 @@ void HuC6280::OPCode0x1E()
 
 void HuC6280::OPCode0x1F()
 {
-    // UNOFFICIAL
-    // SLO $nn,X
-    UnofficialOPCode();
+    // OK
+    // BBR1 ZZ,hhll
+    OPcodes_Branch(!IsSetBit(1, m_memory->Read(ZeroPageAddressing())));
 }
 
 void HuC6280::OPCode0x20()
@@ -336,9 +336,9 @@ void HuC6280::OPCode0x2E()
 
 void HuC6280::OPCode0x2F()
 {
-    // UNOFFICIAL
-    // RLA $nn
-    UnofficialOPCode();
+    // OK
+    // BBR2 ZZ,hhll
+    OPcodes_Branch(!IsSetBit(2, m_memory->Read(ZeroPageAddressing())));
 }
 
 void HuC6280::OPCode0x30()
@@ -444,9 +444,9 @@ void HuC6280::OPCode0x3E()
 
 void HuC6280::OPCode0x3F()
 {
-    // UNOFFICIAL
-    // RLA $nn,X
-    UnofficialOPCode();
+    // OK
+    // BBR3 ZZ,hhll
+    OPcodes_Branch(!IsSetBit(3, m_memory->Read(ZeroPageAddressing())));
 }
 
 void HuC6280::OPCode0x40()
@@ -548,9 +548,9 @@ void HuC6280::OPCode0x4E()
 
 void HuC6280::OPCode0x4F()
 {
-    // UNOFFICIAL
-    // SRE $nn
-    UnofficialOPCode();
+    // OK
+    // BBR4 ZZ,hhll
+    OPcodes_Branch(!IsSetBit(4, m_memory->Read(ZeroPageAddressing())));
 }
 
 void HuC6280::OPCode0x50()
@@ -652,9 +652,9 @@ void HuC6280::OPCode0x5E()
 
 void HuC6280::OPCode0x5F()
 {
-    // UNOFFICIAL
-    // SRE $nn,X
-    UnofficialOPCode();
+    // OK
+    // BBR5 ZZ,hhll
+    OPcodes_Branch(!IsSetBit(5, m_memory->Read(ZeroPageAddressing())));
 }
 
 void HuC6280::OPCode0x60()
@@ -764,9 +764,9 @@ void HuC6280::OPCode0x6E()
 
 void HuC6280::OPCode0x6F()
 {
-    // UNOFFICIAL
-    // RRA $nn
-    UnofficialOPCode();
+    // OK
+    // BBR6 ZZ,hhll
+    OPcodes_Branch(!IsSetBit(6, m_memory->Read(ZeroPageAddressing())));
 }
 
 void HuC6280::OPCode0x70()
@@ -872,9 +872,9 @@ void HuC6280::OPCode0x7E()
 
 void HuC6280::OPCode0x7F()
 {
-    // UNOFFICIAL
-    // RRA $nn,X
-    UnofficialOPCode();
+    // OK
+    // BBR7 ZZ,hhll
+    OPcodes_Branch(!IsSetBit(7, m_memory->Read(ZeroPageAddressing())));
 }
 
 void HuC6280::OPCode0x80()
@@ -975,9 +975,9 @@ void HuC6280::OPCode0x8E()
 
 void HuC6280::OPCode0x8F()
 {
-    // UNOFFICIAL
-    // SAX $nn
-    UnofficialOPCode();
+    // OK
+    // BBS0 ZZ,hhll
+    OPcodes_Branch(IsSetBit(0, m_memory->Read(ZeroPageAddressing())));
 }
 
 void HuC6280::OPCode0x90()
@@ -1078,9 +1078,9 @@ void HuC6280::OPCode0x9E()
 
 void HuC6280::OPCode0x9F()
 {
-    // UNOFFICIAL
-    // AHX $nn,Y
-    UnofficialOPCode();
+    // OK
+    // BBS1 ZZ,hhll
+    OPcodes_Branch(IsSetBit(1, m_memory->Read(ZeroPageAddressing())));
 }
 
 void HuC6280::OPCode0xA0()
@@ -1178,9 +1178,9 @@ void HuC6280::OPCode0xAE()
 
 void HuC6280::OPCode0xAF()
 {
-    // UNOFFICIAL
-    // LAX $nn
-    UnofficialOPCode();
+    // OK
+    // BBS2 ZZ,hhll
+    OPcodes_Branch(IsSetBit(2, m_memory->Read(ZeroPageAddressing())));
 }
 
 void HuC6280::OPCode0xB0()
@@ -1279,9 +1279,9 @@ void HuC6280::OPCode0xBE()
 
 void HuC6280::OPCode0xBF()
 {
-    // UNOFFICIAL
-    // LAX $nn,Y
-    UnofficialOPCode();
+    // OK
+    // BBS3 ZZ,hhll
+    OPcodes_Branch(IsSetBit(3, m_memory->Read(ZeroPageAddressing())));
 }
 
 void HuC6280::OPCode0xC0()
@@ -1380,9 +1380,9 @@ void HuC6280::OPCode0xCE()
 
 void HuC6280::OPCode0xCF()
 {
-    // UNOFFICIAL
-    // DCP $nn
-    UnofficialOPCode();
+    // OK
+    // BBS4 ZZ,hhll
+    OPcodes_Branch(IsSetBit(4, m_memory->Read(ZeroPageAddressing())));
 }
 
 void HuC6280::OPCode0xD0()
@@ -1484,9 +1484,9 @@ void HuC6280::OPCode0xDE()
 
 void HuC6280::OPCode0xDF()
 {
-    // UNOFFICIAL
-    // DCP $nn,X
-    UnofficialOPCode();
+    // OK
+    // BBS5 ZZ,hhll
+    OPcodes_Branch(IsSetBit(5, m_memory->Read(ZeroPageAddressing())));
 }
 
 void HuC6280::OPCode0xE0()
@@ -1584,9 +1584,9 @@ void HuC6280::OPCode0xEE()
 
 void HuC6280::OPCode0xEF()
 {
-    // UNOFFICIAL
-    // ISC $nn
-    UnofficialOPCode();
+    // OK
+    // BBS6 ZZ,hhll
+    OPcodes_Branch(IsSetBit(6, m_memory->Read(ZeroPageAddressing())));
 }
 
 void HuC6280::OPCode0xF0()
@@ -1688,7 +1688,7 @@ void HuC6280::OPCode0xFE()
 
 void HuC6280::OPCode0xFF()
 {
-    // UNOFFICIAL
-    // ISC $nn,X
-    UnofficialOPCode();
+    // OK
+    // BBS7 ZZ,hhll
+    OPcodes_Branch(IsSetBit(7, m_memory->Read(ZeroPageAddressing())));
 }
\ No newline at end of file
diff --git a/src/huc6280_registers.h b/src/huc6280_registers.h
index 0224262..ee4acae 100644
--- a/src/huc6280_registers.h
+++ b/src/huc6280_registers.h
@@ -29,7 +29,9 @@ class EightBitRegister
     u8 GetValue() const;
     void SetValue(u8 value);
     void Increment();
+    void Increment(u8 value);
     void Decrement();
+    void Decrement(u8 value);
 
 private:
     u8 m_value;
@@ -50,11 +52,21 @@ inline void EightBitRegister::Increment()
     m_value++;
 }
 
+inline void EightBitRegister::Increment(u8 value)
+{
+    m_value += value;
+}
+
 inline void EightBitRegister::Decrement()
 {
     m_value--;
 }
 
+inline void EightBitRegister::Decrement(u8 value)
+{
+    m_value -= value;
+}
+
 //////////////////////////////////////////////////////////////////////////
 
 class SixteenBitRegister
@@ -68,7 +80,9 @@ class SixteenBitRegister
     void SetHigh(u8 high);
     void SetValue(u16 value);
     void Increment();
+    void Increment(u16 value);
     void Decrement();
+    void Decrement(u16 value);
 
 private:
     u16 m_value;
@@ -109,9 +123,19 @@ inline void SixteenBitRegister::Increment()
     m_value++;
 }
 
+inline void SixteenBitRegister::Increment(u16 value)
+{
+    m_value += value;
+}
+
 inline void SixteenBitRegister::Decrement()
 {
     m_value--;
 }
 
+inline void SixteenBitRegister::Decrement(u16 value)
+{
+    m_value -= value;
+}
+
 #endif /* HUC6280_REGISTERS_H */
\ No newline at end of file
diff --git a/src/huc6280_timing.h b/src/huc6280_timing.h
index 25fb8a8..773fb0d 100644
--- a/src/huc6280_timing.h
+++ b/src/huc6280_timing.h
@@ -26,21 +26,21 @@ const u8 k_opcode_tstates[256] =
 {
 /*          0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F */
 /* 0x00 */  7, 6, 2, 8, 3, 3, 6, 5, 3, 2, 2, 2, 4, 4, 7, 6,
-/* 0x10 */  2, 5, 2, 8, 4, 4, 6, 6, 2, 4, 2, 7, 4, 4, 7, 7,
+/* 0x10 */  2, 5, 2, 8, 4, 4, 6, 6, 2, 4, 2, 7, 4, 4, 7, 6,
 /* 0x20 */  6, 7, 2, 8, 3, 4, 5, 5, 4, 2, 2, 2, 4, 5, 6, 6,
-/* 0x30 */  2, 7, 7, 8, 4, 4, 6, 6, 2, 5, 2, 7, 4, 5, 7, 7,
+/* 0x30 */  2, 7, 7, 8, 4, 4, 6, 6, 2, 5, 2, 7, 4, 5, 7, 6,
 /* 0x40 */  6, 6, 2, 8, 3, 3, 5, 5, 3, 2, 2, 2, 3, 4, 6, 6,
-/* 0x50 */  2, 5, 2, 8, 4, 4, 6, 6, 2, 4, 2, 7, 4, 4, 7, 7,
+/* 0x50 */  2, 5, 2, 8, 4, 4, 6, 6, 2, 4, 2, 7, 4, 4, 7, 6,
 /* 0x60 */  6, 7, 2, 8, 3, 4, 5, 5, 4, 2, 2, 2, 5, 5, 6, 6,
-/* 0x70 */  2, 7, 7, 8, 4, 4, 6, 6, 2, 5, 2, 7, 4, 5, 7, 7,
-/* 0x80 */  2, 6, 2, 6, 3, 3, 3, 3, 2, 2, 2, 2, 4, 4, 4, 4,
-/* 0x90 */  2, 6, 2, 6, 4, 4, 4, 4, 2, 5, 2, 5, 5, 5, 5, 5,
-/* 0xA0 */  2, 6, 2, 6, 3, 3, 3, 3, 2, 2, 2, 2, 4, 4, 4, 4,
-/* 0xB0 */  2, 5, 2, 5, 4, 4, 4, 4, 2, 4, 2, 4, 4, 4, 4, 4,
+/* 0x70 */  2, 7, 7, 8, 4, 4, 6, 6, 2, 5, 2, 7, 4, 5, 7, 6,
+/* 0x80 */  2, 6, 2, 6, 3, 3, 3, 3, 2, 2, 2, 2, 4, 4, 4, 6,
+/* 0x90 */  2, 6, 2, 6, 4, 4, 4, 4, 2, 5, 2, 5, 5, 5, 5, 6,
+/* 0xA0 */  2, 6, 2, 6, 3, 3, 3, 3, 2, 2, 2, 2, 4, 4, 4, 6,
+/* 0xB0 */  2, 5, 2, 5, 4, 4, 4, 4, 2, 4, 2, 4, 4, 4, 4, 6,
 /* 0xC0 */  2, 6, 2, 8, 3, 3, 5, 5, 2, 2, 2, 2, 4, 4, 6, 6,
-/* 0xD0 */  2, 5, 2, 8, 4, 4, 6, 6, 2, 4, 2, 7, 4, 4, 7, 7,
+/* 0xD0 */  2, 5, 2, 8, 4, 4, 6, 6, 2, 4, 2, 7, 4, 4, 7, 6,
 /* 0xE0 */  2, 6, 2, 8, 3, 3, 5, 5, 2, 2, 2, 2, 4, 4, 6, 6,
-/* 0xF0 */  2, 5, 2, 8, 4, 4, 6, 6, 2, 4, 2, 7, 4, 4, 7, 7
+/* 0xF0 */  2, 5, 2, 8, 4, 4, 6, 6, 2, 4, 2, 7, 4, 4, 7, 6
 };
 
 const u8 k_opcode_tstates_cross_paged[256] =
@@ -67,22 +67,22 @@ const u8 k_opcode_tstates_cross_paged[256] =
 const u8 k_opcode_sizes[256] =
 {
 /*          0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F */
-/* 0x00 */  1, 2, 0, 0, 2, 2, 2, 0, 1, 2, 1, 0, 3, 3, 3, 0,
-/* 0x10 */  2, 2, 0, 0, 2, 2, 2, 0, 1, 3, 1, 0, 3, 3, 3, 0,
-/* 0x20 */  3, 2, 0, 0, 2, 2, 2, 0, 1, 2, 1, 0, 3, 3, 3, 0,
-/* 0x30 */  2, 2, 2, 0, 2, 2, 2, 0, 1, 3, 1, 0, 3, 3, 3, 0,
-/* 0x40 */  1, 2, 0, 0, 2, 2, 2, 0, 1, 2, 1, 0, 3, 3, 3, 0,
-/* 0x50 */  2, 2, 0, 0, 2, 2, 2, 0, 1, 3, 1, 0, 3, 3, 3, 0,
-/* 0x60 */  1, 2, 0, 0, 2, 2, 2, 0, 1, 2, 1, 0, 3, 3, 3, 0,
-/* 0x70 */  2, 2, 2, 0, 2, 2, 2, 0, 1, 3, 1, 0, 3, 3, 3, 0,
-/* 0x80 */  2, 2, 0, 0, 2, 2, 2, 0, 1, 0, 1, 0, 3, 3, 3, 0,
-/* 0x90 */  2, 2, 0, 0, 2, 2, 2, 0, 1, 3, 1, 0, 0, 3, 0, 0,
-/* 0xA0 */  2, 2, 2, 0, 2, 2, 2, 0, 1, 2, 1, 0, 3, 3, 3, 0,
-/* 0xB0 */  2, 2, 0, 0, 2, 2, 2, 0, 1, 3, 1, 0, 3, 3, 3, 0,
-/* 0xC0 */  2, 2, 0, 0, 2, 2, 2, 0, 1, 2, 1, 0, 3, 3, 3, 0,
-/* 0xD0 */  2, 2, 0, 0, 2, 2, 2, 0, 1, 3, 1, 0, 3, 3, 3, 0,
-/* 0xE0 */  2, 2, 0, 0, 2, 2, 2, 0, 1, 2, 1, 0, 3, 3, 3, 0,
-/* 0xF0 */  2, 2, 0, 0, 2, 2, 2, 0, 1, 3, 1, 0, 3, 3, 3, 0
+/* 0x00 */  1, 2, 0, 0, 2, 2, 2, 0, 1, 2, 1, 0, 3, 3, 3, 3,
+/* 0x10 */  2, 2, 0, 0, 2, 2, 2, 0, 1, 3, 1, 0, 3, 3, 3, 3,
+/* 0x20 */  3, 2, 0, 0, 2, 2, 2, 0, 1, 2, 1, 0, 3, 3, 3, 3,
+/* 0x30 */  2, 2, 2, 0, 2, 2, 2, 0, 1, 3, 1, 0, 3, 3, 3, 3,
+/* 0x40 */  1, 2, 0, 0, 2, 2, 2, 0, 1, 2, 1, 0, 3, 3, 3, 3,
+/* 0x50 */  2, 2, 0, 0, 2, 2, 2, 0, 1, 3, 1, 0, 3, 3, 3, 3,
+/* 0x60 */  1, 2, 0, 0, 2, 2, 2, 0, 1, 2, 1, 0, 3, 3, 3, 3,
+/* 0x70 */  2, 2, 2, 0, 2, 2, 2, 0, 1, 3, 1, 0, 3, 3, 3, 3,
+/* 0x80 */  2, 2, 0, 0, 2, 2, 2, 0, 1, 0, 1, 0, 3, 3, 3, 3,
+/* 0x90 */  2, 2, 0, 0, 2, 2, 2, 0, 1, 3, 1, 0, 0, 3, 0, 3,
+/* 0xA0 */  2, 2, 2, 0, 2, 2, 2, 0, 1, 2, 1, 0, 3, 3, 3, 3,
+/* 0xB0 */  2, 2, 0, 0, 2, 2, 2, 0, 1, 3, 1, 0, 3, 3, 3, 3,
+/* 0xC0 */  2, 2, 0, 0, 2, 2, 2, 0, 1, 2, 1, 0, 3, 3, 3, 3,
+/* 0xD0 */  2, 2, 0, 0, 2, 2, 2, 0, 1, 3, 1, 0, 3, 3, 3, 3,
+/* 0xE0 */  2, 2, 0, 0, 2, 2, 2, 0, 1, 2, 1, 0, 3, 3, 3, 3,
+/* 0xF0 */  2, 2, 0, 0, 2, 2, 2, 0, 1, 3, 1, 0, 3, 3, 3, 3
 };