diff --git a/cpu.cpp b/cpu.cpp
index 8f55edd..3a024b6 100644
--- a/cpu.cpp
+++ b/cpu.cpp
@@ -2423,6 +2423,18 @@ json_t *cpu::serialize()
 	if (trap_delay.has_value())
 		json_object_set(j, "trap_delay", json_integer(trap_delay.value()));
 
+	json_t *j_queued_interrupts = json_object();
+	for(auto & il: queued_interrupts) {
+		json_t *ja_qi_level = json_array();
+		for(auto & v: il.second)
+			json_array_append(ja_qi_level, json_integer(v));
+
+		json_object_set(j_queued_interrupts, format("%d", il.first).c_str(), ja_qi_level);
+	}
+	json_object_set(j, "queued_interrupts", j_queued_interrupts);
+
+	json_object_set(j, "any_queued_interrupts", json_boolean(any_queued_interrupts));
+
 	return j;
 }
 
@@ -2454,6 +2466,18 @@ cpu *cpu::deserialize(const json_t *const j, bus *const b, std::atomic_uint32_t
 		c->trap_delay    = json_integer_value(temp);
 	else
 		c->trap_delay.reset();
+	c->any_queued_interrupts = json_boolean_value(json_object_get(j, "any_queued_interrupts"));
+
+	c->init_interrupt_queue();
+	json_t *j_queued_interrupts = json_object_get(j, "queued_interrupts");
+	for(int level=0; level<8; level++) {
+		auto it = c->queued_interrupts.find(level);
+
+		json_t *ja_qi_level = json_object_get(j_queued_interrupts, format("%d", level).c_str());
+
+		for(size_t i=0; i<json_array_size(ja_qi_level); i++)
+			it->second.insert(json_integer_value(json_array_get(ja_qi_level, i)));
+	}
 
 	return c;
 }
diff --git a/cpu.h b/cpu.h
index e5aeab4..98d2430 100644
--- a/cpu.h
+++ b/cpu.h
@@ -62,6 +62,7 @@ private:
 
 	// level, vector
 	std::map<uint8_t, std::set<uint8_t> > queued_interrupts;
+	std::atomic_bool        any_queued_interrupts { false };
 #if defined(BUILD_FOR_RP2040)
 	SemaphoreHandle_t       qi_lock { xSemaphoreCreateBinary() };
 	QueueHandle_t           qi_q    { xQueueCreate(16, 1)      };
@@ -69,7 +70,6 @@ private:
 	std::mutex              qi_lock;
 	std::condition_variable qi_cv;
 #endif
-	std::atomic_bool        any_queued_interrupts { false };
 
 	std::map<int, breakpoint *> breakpoints;
 	int                         bp_nr       { 0 };
diff --git a/disk_backend.cpp b/disk_backend.cpp
index b1cb17d..971be4a 100644
--- a/disk_backend.cpp
+++ b/disk_backend.cpp
@@ -1,6 +1,8 @@
 // (C) 2018-2024 by Folkert van Heusden
 // Released under MIT license
 
+#include <cassert>
+
 #include "disk_backend.h"
 #include "disk_backend_file.h"
 #include "disk_backend_nbd.h"
@@ -17,17 +19,21 @@ disk_backend::~disk_backend()
 #if IS_POSIX
 disk_backend *disk_backend::deserialize(const json_t *const j)
 {
-	std::string type = json_string_value(json_object_get(j, "disk-backend-type"));
+	std::string   type = json_string_value(json_object_get(j, "disk-backend-type"));
+
+	disk_backend *d    = nullptr;
 
 	if (type == "file")
-		return disk_backend_file::deserialize(j);
+		d = disk_backend_file::deserialize(j);
 
-	if (type == "nbd")
-		return disk_backend_nbd::deserialize(j);
+	else if (type == "nbd")
+		d = disk_backend_nbd::deserialize(j);
 
 	// should not be reached
-	assert(false);
+	assert(d);
 
-	return nullptr;
+	d->begin();
+
+	return d;
 }
 #endif
diff --git a/main.cpp b/main.cpp
index c9505e4..d25804c 100644
--- a/main.cpp
+++ b/main.cpp
@@ -570,6 +570,9 @@ int main(int argc, char *argv[])
 		b = bus::deserialize(j, cnsl, &event);
 
 		json_decref(j);
+
+		DOLOG(warning, true, "DO NOT FORGET TO DELETE AND NOT TO RE-USE THE STATE FILE (\"%s\")! (unless updated)", deserialize.c_str());
+		myusleep(251000);
 	}
 
 	if (b->getTty() == nullptr) {