diff --git a/bus.cpp b/bus.cpp
index a081aed..fa741fd 100644
--- a/bus.cpp
+++ b/bus.cpp
@@ -563,6 +563,38 @@ bool bus::get_use_data_space(const int run_mode) const
 	return !!(MMR3 & di_ena_mask[run_mode]);
 }
 
+std::pair<trap_action_t, int> bus::get_trap_action(const int run_mode, const bool d, const int apf, const bool is_write)
+{
+	const int access_control = pages[run_mode][d][apf].pdr & 7;
+
+	trap_action_t trap_action = T_PROCEED;
+
+	if (access_control == 0)
+		trap_action = T_ABORT_4;
+	else if (access_control == 1)
+		trap_action = is_write ? T_ABORT_4 : T_TRAP_250;
+	else if (access_control == 2) {
+		if (is_write)
+			trap_action = T_ABORT_4;
+	}
+	else if (access_control == 3)
+		trap_action = T_ABORT_4;
+	else if (access_control == 4)
+		trap_action = T_TRAP_250;
+	else if (access_control == 5) {
+		if (is_write)
+			trap_action = T_TRAP_250;
+	}
+	else if (access_control == 6) {
+		// proceed
+	}
+	else if (access_control == 7) {
+		trap_action = T_ABORT_4;
+	}
+
+	return { trap_action, access_control };
+}
+
 uint32_t bus::calculate_physical_address(const int run_mode, const uint16_t a, const bool trap_on_failure, const bool is_write, const bool peek_only, const d_i_space_t space)
 {
 	uint32_t m_offset = a;
@@ -586,32 +618,9 @@ uint32_t bus::calculate_physical_address(const int run_mode, const uint16_t a, c
 
 		if (trap_on_failure) {
 			{
-				const int access_control = pages[run_mode][d][apf].pdr & 7;
-
-				enum { T_PROCEED, T_ABORT_4, T_TRAP_250 } trap_action { T_PROCEED };
-
-				if (access_control == 0)
-					trap_action = T_ABORT_4;
-				else if (access_control == 1)
-					trap_action = is_write ? T_ABORT_4 : T_TRAP_250;
-				else if (access_control == 2) {
-					if (is_write)
-						trap_action = T_ABORT_4;
-				}
-				else if (access_control == 3)
-					trap_action = T_ABORT_4;
-				else if (access_control == 4)
-					trap_action = T_TRAP_250;
-				else if (access_control == 5) {
-					if (is_write)
-						trap_action = T_TRAP_250;
-				}
-				else if (access_control == 6) {
-					// proceed
-				}
-				else if (access_control == 7) {
-					trap_action = T_ABORT_4;
-				}
+				auto rc = get_trap_action(run_mode, d, apf, is_write);
+				auto trap_action    = rc.first;
+				int  access_control = rc.second;
 
 				if (trap_action != T_PROCEED) {
 					if (is_write)
diff --git a/bus.h b/bus.h
index d3042b0..b56e453 100644
--- a/bus.h
+++ b/bus.h
@@ -69,6 +69,8 @@ typedef enum { wm_word = 0, wm_byte = 1 } word_mode_t;
 
 typedef enum { rm_prev, rm_cur } rm_selection_t;
 
+typedef enum { T_PROCEED, T_ABORT_4, T_TRAP_250 } trap_action_t;
+
 typedef struct {
 	uint16_t virtual_address;
 	uint8_t  apf;  // active page field
@@ -184,6 +186,7 @@ public:
 	uint32_t get_io_base() const { return MMR0 & 1 ? (MMR3 & 16 ? 017760000 : 0760000) : 0160000; }
 	bool     is_psw(const uint16_t addr, const int run_mode, const d_i_space_t space) const;
 
+	std::pair<trap_action_t, int> get_trap_action(const int run_mode, const bool d, const int apf, const bool is_write);
 	uint32_t calculate_physical_address(const int run_mode, const uint16_t a, const bool trap_on_failure, const bool is_write, const bool peek_only, const d_i_space_t space);
 
 	bool get_use_data_space(const int run_mode) const;
diff --git a/debugger.cpp b/debugger.cpp
index fccf694..7fb1be9 100644
--- a/debugger.cpp
+++ b/debugger.cpp
@@ -621,6 +621,18 @@ void mmu_dump(console *const cnsl, bus *const b, const bool verbose)
 	}
 }
 
+const char *trap_action_to_str(const trap_action_t ta)
+{
+	if (ta == T_PROCEED)
+		return "proceed";
+	if (ta == T_ABORT_4)
+		return "abort (trap 4)";
+	if (ta == T_TRAP_250)
+		return "trap 250";
+
+	return "?";
+}
+
 void mmu_resolve(console *const cnsl, bus *const b, const uint16_t va)
 {
 	int  run_mode = b->getCpu()->getPSW_runmode();
@@ -647,6 +659,14 @@ void mmu_resolve(console *const cnsl, bus *const b, const uint16_t va)
 		dump_par_pdr(cnsl, b, ADDR_PDR_U_START,       ADDR_PAR_U_START,       "user i-space", 0, data.apf);
 		dump_par_pdr(cnsl, b, ADDR_PDR_U_START + 020, ADDR_PAR_U_START + 020, "user d-space", 1 + (!!(mmr3 & 4)), data.apf);
 	}
+
+	for(int i=0; i<2; i++) {
+		auto ta_i = b->get_trap_action(run_mode, false, data.apf, i);
+		auto ta_d = b->get_trap_action(run_mode, true,  data.apf, i);
+
+		cnsl->put_string_lf(format("Instruction action: %s (%s)", trap_action_to_str(ta_i.first), i ? "write" : "read"));
+		cnsl->put_string_lf(format("Data action       : %s (%s)", trap_action_to_str(ta_d.first), i ? "write" : "read"));
+	}
 }
 
 void reg_dump(console *const cnsl, cpu *const c)