diff --git a/bus.cpp b/bus.cpp
index a38aa08..b84b0b0 100644
--- a/bus.cpp
+++ b/bus.cpp
@@ -263,6 +263,15 @@ uint16_t bus::read(const uint16_t a, const bool word_mode, const bool use_prev)
 	return temp;
 }
 
+uint32_t bus::calculate_full_address(const uint16_t a)
+{
+	const uint8_t apf = a >> 13; // active page field
+	bool is_user = c -> getBitPSW(14) && c -> getBitPSW(15);
+	uint32_t m_offset = pages[apf + is_user * 8].par * 64;
+
+	return m_offset + (a & 8191);
+}
+
 uint16_t bus::write(const uint16_t a, const bool word_mode, uint16_t value, const bool use_prev)
 {
 	// fprintf(stderr, "write [%d] %06o to %06o\n", word_mode, value, a);
diff --git a/bus.h b/bus.h
index c6954f0..0b352d6 100644
--- a/bus.h
+++ b/bus.h
@@ -56,4 +56,6 @@ public:
 	uint16_t writeWord(const uint16_t a, const uint16_t value);
 
 	void setMMR2(const uint16_t value) { MMR2 = value; }
+
+	uint32_t calculate_full_address(const uint16_t a);
 };
diff --git a/cpu.cpp b/cpu.cpp
index b3389d7..f097165 100644
--- a/cpu.cpp
+++ b/cpu.cpp
@@ -26,7 +26,7 @@ void cpu::reset()
 	memset(sp, 0x00, sizeof sp);
 	pc = 0;
 	psw = fpsr = 0;
-	resetFlag = haltFlag = false;
+	runMode = resetFlag = haltFlag = false;
 }
 
 uint16_t cpu::getRegister(const int nr, const bool prev_mode) const
diff --git a/cpu.h b/cpu.h
index 7397add..4344a6f 100644
--- a/cpu.h
+++ b/cpu.h
@@ -16,6 +16,7 @@ private:
 	uint16_t psw { 0 }, fpsr { 0 };
 	uint16_t stackLimitRegister { 0 };
 	bool haltFlag { false }, resetFlag { false };
+	bool runMode  { false };
 
 	bool emulateMFPT { false };
 
@@ -60,6 +61,8 @@ public:
 
 	void setEmulateMFPT(const bool v) { emulateMFPT = v; }
 
+	bool getRunMode() { return runMode; }
+
 	bool getPSW_c() const;
 	bool getPSW_v() const;
 	bool getPSW_z() const;