diff --git a/src/spider/runtime/instr/Instr_000-01F.cpp b/src/spider/runtime/instr/Instr_000-01F.cpp
index b96b3a3..80b6f16 100644
--- a/src/spider/runtime/instr/Instr_000-01F.cpp
+++ b/src/spider/runtime/instr/Instr_000-01F.cpp
@@ -295,19 +295,23 @@ namespace spider {
         (this->*_post)();
     }
 
-    void CPU::DMOD() { //It gives error and I dont understand why
+    void CPU::DMOD() {
         // TODO: Implement DMOD 
         fetchOperSrc();
         fetchOperDst();
         switch(_size){
             case 0b00: //byte
-                //_dst->_i8 / _src->_i8 = RX * _src + RY;
+                RX._i8 = _dst->_i8 / _src->_i8;
+                RY._i8 = _dst->_i8 % _src->_i8;
             case 0b01: //short
-                //_dst->_i16 / _src->_i16 = RX * _src->_i16 + RY;
+                RX._i16 = _dst->_i16 / _src->_i16;
+                RY._i16 = _dst->_i16 % _src->_i16;
             case 0b10: //int
-                //_dst->_i32 / _src->_i32 = RX * _src->_i32 + RY;
+                RX._i32 = _dst->_i32 / _src->_i32;
+                RY._i32 = _dst->_i32 % _src->_i32;
             case 0b11: //long
-                //_dst->_i64 / _src->_i64 = RX * _src->_i64 + RY;
+                RX._i64 = _dst->_i64 / _src->_i64;
+                RY._i64 = _dst->_i64 % _src->_i64;
         }
         (this->*_post)();
     }
@@ -318,13 +322,17 @@ namespace spider {
         fetchOperDst();
         switch(_size){
             case 0b00: //byte
-                //_dst->_u8 / _src->_u8 = RX * _src->_u8 + RY;
+                RX._u8 = _dst->_u8 / _src->_u8;
+                RY._u8 = _dst->_u8 % _src->_u8;
             case 0b01: //short
-                //_dst->_u16 / _src->_u16 = RX * _src->_u16 + RY;
+                RX._u16 = _dst->_u16 / _src->_u16;
+                RY._u16 = _dst->_u16 % _src->_u16;
             case 0b10: //int
-                //_dst->_u32 / _src->_u32 = RX * _src->_u32 + RY;
+                RX._u32 = _dst->_u32 / _src->_u32;
+                RY._u32 = _dst->_u32 % _src->_u32;
             case 0b11: //long
-                //_dst->_u64 / _src->_u64 = RX * _src->_u64 + RY;
+                RX._u64 = _dst->_u64 / _src->_u64;
+                RY._u64 = _dst->_u64 % _src->_u64;
         }
         (this->*_post)();
     }
@@ -334,13 +342,13 @@ namespace spider {
         fetchOperDst();
         switch(_size){
             case 0b00: //byte
-                _dst->_u8 = 1;
+                RF = (RF & ~(0x3 << 9)) | ((_dst->_u8 >> 9) & 0x3) << 9;
             case 0b01: //short
-                _dst->_u16 = 1;
+                RF = (RF & ~(0x3 << 9)) | ((_dst->_u16 >> 9) & 0x3) << 9;
             case 0b10: //int
-                _dst->_u32 = 1;
+                RF = (RF & ~(0x3 << 9)) | ((_dst->_u32 >> 9) & 0x3) << 9;
             case 0b11: //long
-                _dst->_u64 = 1;
+                RF = (RF & ~(0x3 << 9)) | ((_dst->_u64 >> 9) & 0x3) << 9;
         }
         (this->*_post)();
     }
diff --git a/src/spider/runtime/instr/Instr_020-03F.cpp b/src/spider/runtime/instr/Instr_020-03F.cpp
index 58a8805..42d1838 100644
--- a/src/spider/runtime/instr/Instr_020-03F.cpp
+++ b/src/spider/runtime/instr/Instr_020-03F.cpp
@@ -13,7 +13,8 @@ namespace spider {
         fetchOperDst();
         switch(_size){
             case 0b00: //byte
-                _dst->_u8 = 1;
+            
+                _dst->_u8 = _src->_u8 == 0;
             case 0b01: //short
                 _dst->_u16 = 1;
             case 0b10: //int