diff --git a/src/huc6280.h b/src/huc6280.h
index b3df760..fb24249 100644
--- a/src/huc6280.h
+++ b/src/huc6280.h
@@ -131,6 +131,11 @@ class HuC6280
     void OPCodes_TRB(u16 address);
     void OPCodes_TSB(u16 address);
     void OPCodes_TST(u8 value, u16 address);
+    void OPCodes_TAI();
+    void OPCodes_TDD();
+    void OPCodes_TIA();
+    void OPCodes_TII();
+    void OPCodes_TIN();
 
     void InitOPCodeFunctors();
 
diff --git a/src/huc6280_opcodes.cpp b/src/huc6280_opcodes.cpp
index 8552b50..a105cfe 100644
--- a/src/huc6280_opcodes.cpp
+++ b/src/huc6280_opcodes.cpp
@@ -849,9 +849,9 @@ void HuC6280::OPCode0x72()
 
 void HuC6280::OPCode0x73()
 {
-    // UNOFFICIAL
-    // RRA ($n),Y
-    UnofficialOPCode();
+    // OK
+    // TII
+    OPCodes_TII();
 }
 
 void HuC6280::OPCode0x74()
@@ -1421,9 +1421,9 @@ void HuC6280::OPCode0xC2()
 
 void HuC6280::OPCode0xC3()
 {
-    // UNOFFICIAL
-    // DCP $(nn,X)
-    UnofficialOPCode();
+    // OK
+    // TDD
+    OPCodes_TDD();
 }
 
 void HuC6280::OPCode0xC4()
@@ -1533,9 +1533,9 @@ void HuC6280::OPCode0xD2()
 
 void HuC6280::OPCode0xD3()
 {
-    // UNOFFICIAL
-    // DCP ($n),Y
-    UnofficialOPCode();
+    // OK
+    // TIN
+    OPCodes_TIN();
 }
 
 void HuC6280::OPCode0xD4()
@@ -1645,9 +1645,9 @@ void HuC6280::OPCode0xE2()
 
 void HuC6280::OPCode0xE3()
 {
-    // UNOFFICIAL
-    // ISC $(nn,X)
-    UnofficialOPCode();
+    // OK
+    // TIA
+    OPCodes_TIA();
 }
 
 void HuC6280::OPCode0xE4()
@@ -1751,9 +1751,9 @@ void HuC6280::OPCode0xF2()
 
 void HuC6280::OPCode0xF3()
 {
-    // UNOFFICIAL
-    // ISC ($n),Y
-    UnofficialOPCode();
+    // OK
+    // TAI
+    OPCodes_TAI();
 }
 
 void HuC6280::OPCode0xF4()
diff --git a/src/huc6280_opcodes_inline.h b/src/huc6280_opcodes_inline.h
index 3278bce..baf42c5 100644
--- a/src/huc6280_opcodes_inline.h
+++ b/src/huc6280_opcodes_inline.h
@@ -554,4 +554,79 @@ inline void HuC6280::OPCodes_TST(u8 value, u16 address)
     SetOverflowFlagFromResult(result);
 }
 
+inline void HuC6280::OPCodes_TAI()
+{
+    // TODO
+    u16 source = Fetch16();
+    u16 dest = Fetch16();
+    u16 length = Fetch16();
+
+    for (u16 i = 0; i < length; i++)
+    {
+        u8 value = m_memory->Read(source + i);
+        m_memory->Write(dest + i, value);
+        m_t_states += 6;
+    }
+}
+
+inline void HuC6280::OPCodes_TDD()
+{
+    // TODO
+    u16 source = Fetch16();
+    u16 dest = Fetch16();
+    u16 length = Fetch16();
+
+    for (u16 i = 0; i < length; i++)
+    {
+        u8 value = m_memory->Read(source + i);
+        m_memory->Write(dest + i, value);
+        m_t_states += 6;
+    }
+}
+
+inline void HuC6280::OPCodes_TIA()
+{
+    // TODO
+    u16 source = Fetch16();
+    u16 dest = Fetch16();
+    u16 length = Fetch16();
+
+    for (u16 i = 0; i < length; i++)
+    {
+        u8 value = m_memory->Read(source + i);
+        m_memory->Write(dest + i, value);
+        m_t_states += 6;
+    }
+}
+
+inline void HuC6280::OPCodes_TII()
+{
+    // TODO
+    u16 source = Fetch16();
+    u16 dest = Fetch16();
+    u16 length = Fetch16();
+
+    for (u16 i = 0; i < length; i++)
+    {
+        u8 value = m_memory->Read(source + i);
+        m_memory->Write(dest + i, value);
+        m_t_states += 6;
+    }
+}
+
+inline void HuC6280::OPCodes_TIN()
+{
+    // TODO
+    u16 source = Fetch16();
+    u16 dest = Fetch16();
+    u16 length = Fetch16();
+
+    for (u16 i = 0; i < length; i++)
+    {
+        u8 value = m_memory->Read(source + i);
+        m_memory->Write(dest + i, value);
+        m_t_states += 6;
+    }
+}
+
 #endif /* HUC6280_OPCODES_INLINE_H */
\ No newline at end of file
diff --git a/src/huc6280_timing.h b/src/huc6280_timing.h
index 84bc847..6cdfb83 100644
--- a/src/huc6280_timing.h
+++ b/src/huc6280_timing.h
@@ -32,15 +32,15 @@ const u8 k_opcode_tstates[256] =
 /* 0x40 */  7, 7, 3, 4, 8, 4, 6, 7, 3, 2, 2, 2, 4, 5, 7, 6,
 /* 0x50 */  2, 7, 7, 5, 4, 4, 6, 7, 2, 5, 3, 7, 4, 5, 7, 6,
 /* 0x60 */  7, 7, 2, 8, 4, 4, 6, 7, 4, 2, 2, 2, 7, 5, 7, 6,
-/* 0x70 */  2, 7, 7, 8, 4, 4, 6, 7, 2, 5, 4, 7, 7, 5, 7, 6,
+/* 0x70 */  2, 7, 7, 17, 4, 4, 6, 7, 2, 5, 4, 7, 7, 5, 7, 6,
 /* 0x80 */  2, 7, 2, 7, 4, 4, 4, 7, 2, 2, 2, 2, 5, 5, 5, 6,
 /* 0x90 */  2, 7, 7, 8, 4, 4, 4, 7, 2, 5, 2, 5, 5, 5, 5, 6,
 /* 0xA0 */  2, 7, 2, 7, 4, 4, 4, 7, 2, 2, 2, 2, 5, 5, 5, 6,
 /* 0xB0 */  2, 7, 7, 8, 4, 4, 4, 7, 2, 5, 2, 4, 5, 5, 5, 6,
-/* 0xC0 */  2, 7, 2, 8, 4, 4, 6, 7, 2, 2, 2, 2, 5, 5, 7, 6,
-/* 0xD0 */  2, 7, 7, 8, 4, 4, 6, 7, 2, 5, 3, 7, 4, 5, 7, 6,
-/* 0xE0 */  2, 6, 2, 8, 4, 3, 6, 7, 2, 2, 2, 2, 5, 4, 7, 6,
-/* 0xF0 */  2, 5, 2, 8, 2, 4, 6, 7, 2, 4, 4, 7, 4, 4, 7, 6
+/* 0xC0 */  2, 7, 2, 17, 4, 4, 6, 7, 2, 2, 2, 2, 5, 5, 7, 6,
+/* 0xD0 */  2, 7, 7, 17, 4, 4, 6, 7, 2, 5, 3, 7, 4, 5, 7, 6,
+/* 0xE0 */  2, 6, 2, 17, 4, 3, 6, 7, 2, 2, 2, 2, 5, 4, 7, 6,
+/* 0xF0 */  2, 5, 2, 17, 2, 4, 6, 7, 2, 4, 4, 7, 4, 4, 7, 6
 };
 
 const u8 k_opcode_sizes[256] =
@@ -53,15 +53,15 @@ const u8 k_opcode_sizes[256] =
 /* 0x40 */  1, 2, 1, 2, 2, 2, 2, 2, 1, 2, 1, 0, 3, 3, 3, 3,
 /* 0x50 */  2, 2, 2, 2, 2, 2, 2, 2, 1, 3, 1, 0, 3, 3, 3, 3,
 /* 0x60 */  1, 2, 1, 0, 2, 2, 2, 2, 1, 2, 1, 0, 3, 3, 3, 3,
-/* 0x70 */  2, 2, 2, 0, 2, 2, 2, 2, 1, 3, 1, 0, 3, 3, 3, 3,
+/* 0x70 */  2, 2, 2, 7, 2, 2, 2, 2, 1, 3, 1, 0, 3, 3, 3, 3,
 /* 0x80 */  2, 2, 1, 3, 2, 2, 2, 2, 1, 2, 1, 0, 3, 3, 3, 3,
 /* 0x90 */  2, 2, 2, 4, 2, 2, 2, 2, 1, 3, 1, 0, 3, 3, 3, 3,
 /* 0xA0 */  2, 2, 2, 3, 2, 2, 2, 2, 1, 2, 1, 0, 3, 3, 3, 3,
 /* 0xB0 */  2, 2, 2, 4, 2, 2, 2, 2, 1, 3, 1, 0, 3, 3, 3, 3,
-/* 0xC0 */  2, 2, 1, 0, 2, 2, 2, 2, 1, 2, 1, 0, 3, 3, 3, 3,
-/* 0xD0 */  2, 2, 2, 0, 2, 2, 2, 2, 1, 3, 1, 0, 3, 3, 3, 3,
-/* 0xE0 */  2, 2, 0, 0, 2, 2, 2, 2, 1, 2, 1, 0, 3, 3, 3, 3,
-/* 0xF0 */  2, 2, 0, 0, 1, 2, 2, 2, 1, 3, 1, 0, 3, 3, 3, 3
+/* 0xC0 */  2, 2, 1, 7, 2, 2, 2, 2, 1, 2, 1, 0, 3, 3, 3, 3,
+/* 0xD0 */  2, 2, 2, 7, 2, 2, 2, 2, 1, 3, 1, 0, 3, 3, 3, 3,
+/* 0xE0 */  2, 2, 0, 7, 2, 2, 2, 2, 1, 2, 1, 0, 3, 3, 3, 3,
+/* 0xF0 */  2, 2, 0, 7, 1, 2, 2, 2, 1, 3, 1, 0, 3, 3, 3, 3
 };
 
 const u8 k_opcode_tstates_cross_paged[256] =