diff --git a/include/instructions.h b/include/instructions.h
index 65c3508..8e81bff 100644
--- a/include/instructions.h
+++ b/include/instructions.h
@@ -136,5 +136,6 @@ public:
   void or_rm32_imm(int imm_flag);
   void adc_rm32_imm(int imm_flag);
   void sbb_rm32_imm(int imm_flag);
+  void and_rm32_imm(int imm_flag);
   void cmp_rm32_imm8();
 };
diff --git a/instructions.cpp b/instructions.cpp
index eb36fe9..a5dc016 100644
--- a/instructions.cpp
+++ b/instructions.cpp
@@ -484,7 +484,7 @@ void Instructions::opcode_81(){
       sbb_rm32_imm(IMM32);
       break;
     case 4:
-      // TODO: and_rm32_imm32();
+      and_rm32_imm(IMM32);
       break;
     case 5:
       // TODO: sub_rm32_imm32();
@@ -520,7 +520,7 @@ void Instructions::opcode_83(){
       sbb_rm32_imm(IMM8);
       break;
     case 4:
-      // TODO: and_rm32_imm8();
+      and_rm32_imm(IMM8);
       break;
     case 5:
       // TODO: sub_rm32_imm8();
@@ -856,6 +856,24 @@ void Instructions::sbb_rm32_imm(int imm_flag){
   this->eip++;
 }
 
+void Instructions::and_rm32_imm(int imm_flag){
+  //printf("and_rm32_imm called.\n");
+
+  this->eip++;
+
+  if(imm_flag == IMM8){
+    uint8_t imm8 = memory.read_uint8(this->eip);
+    this->registers[this->M] &= imm8;
+  } else if(imm_flag == IMM32){
+    uint32_t imm32 = memory.read_uint32(this->eip);
+    imm32 = swap_endian32(imm32);
+    this->registers[this->M] &= imm32;
+  } else {
+  }
+
+  this->eip++;
+}
+
 void Instructions::cmp_rm32_imm8(){
   //printf("cmp_rm32_imm8 called.\n");