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diff --git a/3c_disasm/instr/sth.cpp b/3c_disasm/instr/sth.cpp
new file mode 100644
index 0000000..aa2c1c3
--- /dev/null
+++ b/3c_disasm/instr/sth.cpp
@@ -0,0 +1,96 @@
+#include "../Iinstr.hpp"
+
+
+class Csth : public Iinstr {
+	public:
+		Csth();
+		void evalInstr();
+		void execInstr();
+		std::string toString();
+		Iinstr* getNew();
+};
+
+/**
+ * Name:      create_instruction
+ * Purpose:   if compiled as shared library, this functions creates the 
+              instruction object
+
+ * Returns:   pointer to instruction object
+ */
+extern "C" Iinstr* create_instruction() {
+    return new Csth();
+}
+
+Iinstr* Csth::getNew()
+{
+    return new Csth();
+}
+
+/**
+ * Name:      destroy_instruction
+ * Purpose:   if compiled as shared library, this functions destoys the 
+              instruction object
+
+ * Parameter: IInstruction - the instruction object to delete
+ */
+extern "C" void destroy_instruction(Iinstr* p) {
+    delete p;
+}
+
+Csth::Csth()
+{
+	opcode = B5(10001);
+	name = "sth";
+}
+
+void Csth::evalInstr()
+{
+	this->m_s = true;
+
+	dynamic_bitset<> immb = argbits;
+	immb.resize(15);
+	this->m_imm = this->generate15ImmSign(immb.to_ulong());
+
+	argbits >>= 15;
+	m_ra = this->getRegister(argbits);
+	argbits >>= 4;
+	m_rd = this->getRegister(argbits);
+
+}
+
+#include <iomanip>
+#define AS_HEX std::hex << setw(8) << setfill('0')
+
+void Csth::execInstr()
+{
+	//cout << "should exec " << this->toString() << endl;
+	CDat addr = this->m_cpu->getRegister(this->m_ra);
+	addr += m_imm;
+	MEMORY_ADDRESS temp = (addr & (~(BYTE_COUNT-1)));
+	CDat offset = addr-temp;
+	if(offset%2 == 1) {
+		cerr << "you try to get an invalid halfword!" << endl;
+		return;
+	}
+	CDat val = this->m_cpu->getRAM(temp);
+
+	val = val & ~( ((1<<16)-1) << (offset*8));
+
+	//data to insert
+	CDat source = this->m_cpu->getRegister(this->m_rd);
+	source = (source & (((1<<16)-1))) << (offset*8);
+
+	val += source;
+
+	this->m_cpu->setRAM(temp, val);
+}
+
+std::string Csth::toString()
+{
+	stringstream op;
+	op << this->getName();
+
+	op << this->getConditionFlag() << " r" << m_rd << ", " << m_imm << "(r" <<  m_ra << ")";
+
+	return op.str();
+}