diff --git a/src/spider/runtime/instr/Instr_000-01F.cpp b/src/spider/runtime/instr/Instr_000-01F.cpp
index d2933e9..89f661d 100644
--- a/src/spider/runtime/instr/Instr_000-01F.cpp
+++ b/src/spider/runtime/instr/Instr_000-01F.cpp
@@ -69,10 +69,34 @@ namespace spider {
 
     void CPU::COM() {
         // TODO: Implement COM
+        fetchOperDst();
+        switch(_size){
+            case 0b00:
+                _dst->_u8 = ~_dst->_u8;
+            case 0b01:
+                _dst->_u16 = ~_dst->_u16;
+            case 0b10:
+                _dst->_u32 = ~_dst->_u32;
+            case 0b11:
+                _dst->_u64 = ~_dst->_u64;
+        }
+        (this->*_post)();
     }
 
     void CPU::NEG() {
         // TODO: Implement NEG
+        fetchOperDst();
+        switch(_size){
+            case 0b00:
+                _dst->_u8 = 1 + ~_dst->_u8;
+            case 0b01:
+                _dst->_u16 = 1+ ~_dst->_u16;
+            case 0b10:
+                _dst->_u32 = 1 + ~_dst->_u32;
+            case 0b11:
+                _dst->_u64 = 1 + ~_dst->_u64;
+        }
+        (this->*_post)();
     }
 
     void CPU::EXS() {