diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1eb91ef..d8c8975 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -69,12 +69,15 @@ add_executable(unit_tests
         tests/CPU/testInternal.cpp
         sources/Ram/ExtendedRam.cpp
         sources/Ram/ExtendedRam.hpp
-        sources/Utility/Utility.hpp sources/Utility/Utility.cpp
+        sources/Utility/Utility.hpp
+        sources/Utility/Utility.cpp
         sources/APU/Instructions/Bit.cpp
         sources/APU/Instructions/Stack.cpp
         sources/APU/Instructions/Subroutine.cpp
         sources/APU/Instructions/ProgramFlow.cpp
-        sources/APU/Operand.cpp)
+        sources/APU/Operand.cpp
+        sources/APU/Instructions/DecimalCompensation.cpp;
+)
 
 # include criterion & coverage
 target_link_libraries(unit_tests criterion -lgcov)
@@ -160,7 +163,9 @@ add_executable(ComSquare
         sources/APU/Instructions/Stack.cpp
         sources/APU/Instructions/Subroutine.cpp
         sources/APU/Instructions/ProgramFlow.cpp
-        sources/APU/Operand.cpp)
+        sources/APU/Operand.cpp
+        sources/APU/Instructions/DecimalCompensation.cpp
+)
 
 target_compile_definitions(ComSquare PUBLIC DEBUGGER_ENABLED)
 
diff --git a/sources/APU/APU.cpp b/sources/APU/APU.cpp
index 2658bf5..0eb04b8 100644
--- a/sources/APU/APU.cpp
+++ b/sources/APU/APU.cpp
@@ -304,6 +304,8 @@ namespace ComSquare::APU
 			return this->CLR1(this->_getDirectAddr(), 5);
 		case 0xB3:
 			return this->BBC(this->_getDirectAddr(), 5);
+		case 0xBE:
+			return this->DAS();
 		case 0xC0:
 			return this->DI();
 		case 0xC1:
@@ -326,6 +328,8 @@ namespace ComSquare::APU
 			return this->BBC(this->_getDirectAddr(), 6);
 		case 0xDE:
 			return this->CBNE(this->_getDirectAddrByX(), true);
+		case 0xDF:
+			return this->DAA();
 		case 0xE1:
 			return this->TCALL(14);
 		case 0xE2:
diff --git a/sources/APU/APU.hpp b/sources/APU/APU.hpp
index 1088166..ed8db1f 100644
--- a/sources/APU/APU.hpp
+++ b/sources/APU/APU.hpp
@@ -267,6 +267,11 @@ namespace ComSquare::APU
 		int DBNZ(bool direct_addr = false);
 		//! @brief Jump to the specified location.
 		int JMP(uint24_t addr, bool by_x = false);
+
+		//! @brief Decimal adjusts A for addition.
+		int DAA();
+		//! @brief Decimal adjusts A for subtraction.
+		int DAS();
 	public:
 		explicit APU(std::shared_ptr<MemoryMap> &map);
 		APU(const APU &) = default;
diff --git a/sources/APU/Instructions/DecimalCompensation.cpp b/sources/APU/Instructions/DecimalCompensation.cpp
new file mode 100644
index 0000000..7098e0c
--- /dev/null
+++ b/sources/APU/Instructions/DecimalCompensation.cpp
@@ -0,0 +1,36 @@
+//
+// Created by Melefo on 25/02/2020.
+//
+
+#include "../APU.hpp"
+
+namespace ComSquare::APU
+{
+	int APU::DAA()
+	{
+		if (this->_internalRegisters.c || this->_internalRegisters.a > 0x99) {
+			this->_internalRegisters.c = true;
+			this->_internalRegisters.a += 0x60;
+		}
+		if (this->_internalRegisters.h || (this->_internalRegisters.a & 0x0Fu) > 0x09) {
+			this->_internalRegisters.a += 0x06;
+		}
+		this->_internalRegisters.n = this->_internalRegisters.a & 0x80u;
+		this->_internalRegisters.z = !this->_internalRegisters.a;
+		return 3;
+	}
+
+	int APU::DAS()
+	{
+		if (!this->_internalRegisters.c || this->_internalRegisters.a > 0x99) {
+			this->_internalRegisters.c = false;
+			this->_internalRegisters.a -= 0x60;
+		}
+		if (!this->_internalRegisters.h || (this->_internalRegisters.a & 0x0Fu) > 0x09) {
+			this->_internalRegisters.a -= 0x06;
+		}
+		this->_internalRegisters.n = this->_internalRegisters.a & 0x80u;
+		this->_internalRegisters.z = !this->_internalRegisters.a;
+		return 3;
+	}
+}
\ No newline at end of file
diff --git a/tests/APU/testAPUInstructions.cpp b/tests/APU/testAPUInstructions.cpp
index 2eb273a..2403348 100644
--- a/tests/APU/testAPUInstructions.cpp
+++ b/tests/APU/testAPUInstructions.cpp
@@ -466,11 +466,11 @@ Test(Subroutine, RETI)
 	cr_assert_eq(apu->_internalRegisters.pcl, 0x56);
 }
 
-/////////////////////////////
-//						   //
-// Subroutine Program Flow //
-//						   //
-/////////////////////////////
+////////////////////////
+//					  //
+// Program Flow tests //
+//					  //
+////////////////////////
 
 Test(ProgramFlow, BRA)
 {
@@ -696,4 +696,40 @@ Test(ProgramFlow, JMP)
 	result = apu->JMP(apu->_getAbsoluteAddrByX(), true);
 	cr_assert_eq(result, 6);
 	cr_assert_eq(apu->_internalRegisters.pc, 61712);
+}
+
+////////////////////////////////
+//							  //
+// Decimal Compensation tests //
+//							  //
+////////////////////////////////
+
+Test(DecimalCompensation, DAA)
+{
+	auto apu = Init().second.apu;
+	int result = 0;
+
+	apu->_internalRegisters.c = true;
+	apu->_internalRegisters.h = true;
+	apu->_internalRegisters.a = 0x1A;
+	result = apu->DAA();
+	cr_assert_eq(result, 3);
+	cr_assert_eq(apu->_internalRegisters.a, 0x80);
+	cr_assert_eq(apu->_internalRegisters.n, true);
+	cr_assert_eq(apu->_internalRegisters.z, false);
+}
+
+Test(DecimalCompensation, DAS)
+{
+	auto apu = Init().second.apu;
+	int result = 0;
+
+	apu->_internalRegisters.c = false;
+	apu->_internalRegisters.h = false;
+	apu->_internalRegisters.a = 0xFF;
+	result = apu->DAS();
+	cr_assert_eq(result, 3);
+	cr_assert_eq(apu->_internalRegisters.a, 0x99);
+	cr_assert_eq(apu->_internalRegisters.n, true);
+	cr_assert_eq(apu->_internalRegisters.z, false);
 }
\ No newline at end of file