diff --git a/bus.cpp b/bus.cpp
index a565a9c..cbc4e74 100644
--- a/bus.cpp
+++ b/bus.cpp
@@ -423,6 +423,11 @@ uint16_t bus::write(const uint16_t a, const bool word_mode, uint16_t value, cons
 			return value;
 		}
 
+		if (a == 0177570) {  // switch register
+			switch_register = value;
+			return value;
+		}
+
 		///////////
 
 		if (a == 0177374) { // FIXME
diff --git a/bus.h b/bus.h
index 93ffe0e..4051e78 100644
--- a/bus.h
+++ b/bus.h
@@ -33,6 +33,8 @@ private:
 
 	uint16_t MMR2 { 0 }, MMR3 { 0 }, CPUERR { 0 }, PIR { 0 }, CSR { 0 };
 
+	uint16_t switch_register { 0 };
+
 public:
 	bus();
 	~bus();
@@ -59,5 +61,7 @@ public:
 
 	void setMMR2(const uint16_t value) { MMR2 = value; }
 
+	uint16_t get_switch_register() const { return switch_register; }
+
 	uint32_t calculate_full_address(const uint16_t a);
 };
diff --git a/main.cpp b/main.cpp
index 0acc542..4f3e568 100644
--- a/main.cpp
+++ b/main.cpp
@@ -16,10 +16,14 @@
 #include "error.h"
 
 struct termios org_tty_opts { 0 };
+bool withUI = false;
 
 void reset_terminal()
 {
-	tcsetattr(STDIN_FILENO, TCSANOW, &org_tty_opts);
+	if (withUI)
+		endwin();
+	else
+		tcsetattr(STDIN_FILENO, TCSANOW, &org_tty_opts);
 }
 
 void loadbin(bus *const b, uint16_t base, const char *const file)
@@ -225,7 +229,7 @@ int main(int argc, char *argv[])
 
 	c -> setEmulateMFPT(true);
 
-	bool testMode = false, testCases = false, withUI = false;
+	bool testMode = false, testCases = false;
 	int opt = -1;
 	while((opt = getopt(argc, argv, "hm:T:R:p:nL:")) != -1)
 	{
@@ -333,9 +337,10 @@ int main(int argc, char *argv[])
 					tty_->sendChar(ch);
 			}
 
-			if (icount % 1000000 == 0 && withUI) {
+			if (icount % 100000 == 0 && withUI) {
 				unsigned long now = get_ms();
 				mvwprintw(w_main_b -> win, 0, 24, "%.1f/s   ", icount * 1000.0 / (now - start));
+				mvwprintw(w_main_b -> win, 0, 42, "%06o", b->get_switch_register());
 				mydoupdate();
 			}
 		}