diff --git a/src/spider/runtime/instr/Instr_000-01F.cpp b/src/spider/runtime/instr/Instr_000-01F.cpp
index 088b8d9..21a8cf5 100644
--- a/src/spider/runtime/instr/Instr_000-01F.cpp
+++ b/src/spider/runtime/instr/Instr_000-01F.cpp
@@ -118,26 +118,102 @@ namespace spider {
 
     void CPU::INC() {
         // TODO: Implement INC
+        fetchOperDst();
+        switch(_size){
+            case 0b00: //byte
+                _dst->_u8 += 1;
+            case 0b01: //short
+                _dst->_u16 += 1;
+            case 0b10: //int
+                _dst->_u32 += 1;
+            case 0b11: //long
+                _dst->_u64 += 1;
+        }
+        (this->*_post)();
     }
 
     void CPU::DEC() {
         // TODO: Implement DEC
+        fetchOperDst();
+        switch(_size){
+            case 0b00: //byte
+                _dst->_u8 -= 1;
+            case 0b01: //short
+                _dst->_u16 -= 1;
+            case 0b10: //int
+                _dst->_u32 -= 1;
+            case 0b11: //long
+                _dst->_u64 -= 1;
+        }
+        (this->*_post)();
     }
 
     void CPU::ADD() {
         // TODO: Implement ADD
+        fetchOperSrc();
+        fetchOperDst();
+        switch(_size){
+            case 0b00: //byte
+                _dst->_u8 += _src->_u8;
+            case 0b01: //short
+                _dst->_u16 += _src->_u16;
+            case 0b10: //int
+                _dst->_u32 += _src->_u32;
+            case 0b11: //long
+                _dst->_u64 += _src->_u64;
+        }
+        (this->*_post)();
     }
 
     void CPU::SUB() {
         // TODO: Implement SUB
+        fetchOperSrc();
+        fetchOperDst();
+        switch(_size){
+            case 0b00: //byte
+                _dst->_u8 -= _src->_u8;
+            case 0b01: //short
+                _dst->_u16 -= _src->_u16;
+            case 0b10: //int
+                _dst->_u32 -= _src->_u32;
+            case 0b11: //long
+                _dst->_u64 -= _src->_u64;
+        }
+        (this->*_post)();
     }
 
     void CPU::MUL() {
         // TODO: Implement MUL
+        fetchOperSrc();
+        fetchOperDst();
+        switch(_size){
+            case 0b00: //byte
+                _dst->_u8 = _src->_u8 * _dst->_u8;
+            case 0b01: //short
+                _dst->_u16 = _src->_u16 * _dst->_u16;
+            case 0b10: //int
+                _dst->_u32 = _src->_u32 * _dst->_u32;
+            case 0b11: //long
+                _dst->_i64 = _src->_i64 * _dst->_i64;
+        }
+        (this->*_post)();
     }
 
     void CPU::UMUL() {
         // TODO: Implement UMUL
+        fetchOperSrc();
+        fetchOperDst();
+        switch(_size){
+            case 0b00: //byte
+                _dst->_u8 = _src->_u8 * _dst->_u8;
+            case 0b01: //short
+                _dst->_u16 = _src->_u16 * _dst->_u16;
+            case 0b10: //int
+                _dst->_u32 = _src->_u32 * _dst->_u32;
+            case 0b11: //long
+                _dst->_u64 = _src->_u64 * _dst->_u64;
+        }
+        (this->*_post)();
     }
 
     void CPU::DIV() {