diff --git a/src/mame/drivers/popeye.cpp b/src/mame/drivers/popeye.cpp
index 01d2d95ac58..d9e7a29df2d 100644
--- a/src/mame/drivers/popeye.cpp
+++ b/src/mame/drivers/popeye.cpp
@@ -1,5 +1,5 @@
 // license:BSD-3-Clause
-// copyright-holders:Nicola Salmoria, Couriersud
+// copyright-holders:smf, Nicola Salmoria, Couriersud
 // thanks-to: Marc Lafontaine
 /***************************************************************************
 
@@ -21,7 +21,6 @@ Notes:
 #include "machine/eepromser.h"
 #include "machine/netlist.h"
 #include "netlist/devices/net_lib.h"
-#include "sound/ay8910.h"
 #include "screen.h"
 #include "speaker.h"
 
@@ -121,6 +120,22 @@ void tnx1_state::driver_start()
 	save_item(NAME(m_prot1));
 	save_item(NAME(m_prot_shift));
 	save_item(NAME(m_nmi_enabled));
+
+	m_prot0 = 0;
+	m_prot1 = 0;
+	m_prot_shift = 0;
+	m_nmi_enabled = false;
+}
+
+void tpp2_state::driver_start()
+{
+	tnx1_state::driver_start();
+
+	save_item(NAME(m_watchdog_enabled));
+	save_item(NAME(m_watchdog_counter));
+
+	m_watchdog_enabled = false;
+	m_watchdog_counter = 0;
 }
 
 void tnx1_state::decrypt_rom()
@@ -153,7 +168,21 @@ void tpp2_state::decrypt_rom()
 
 WRITE8_MEMBER(tnx1_state::refresh_w)
 {
-	m_nmi_enabled = ((offset >> 8) & 1) != 0;
+	const bool nmi_enabled = ((offset >> 8) & 1) != 0;
+	if (m_nmi_enabled != nmi_enabled)
+	{
+		m_nmi_enabled = nmi_enabled;
+
+		if (!m_nmi_enabled)
+			m_maincpu->set_input_line(INPUT_LINE_NMI, CLEAR_LINE);
+	}
+}
+
+WRITE8_MEMBER(tpp2_state::refresh_w)
+{
+	tnx1_state::refresh_w(space, offset, data, mem_mask);
+
+	m_watchdog_enabled = ((offset >> 9) & 1) != 0;
 }
 
 WRITE_LINE_MEMBER(tnx1_state::screen_vblank)
@@ -166,10 +195,32 @@ WRITE_LINE_MEMBER(tnx1_state::screen_vblank)
 
 		m_field ^= 1;
 		if (m_nmi_enabled)
-			m_maincpu->set_input_line(INPUT_LINE_NMI, PULSE_LINE);
+			m_maincpu->set_input_line(INPUT_LINE_NMI, ASSERT_LINE);
 	}
 }
 
+WRITE_LINE_MEMBER(tpp2_state::screen_vblank)
+{
+	tnx1_state::screen_vblank(state);
+
+	if (state)
+	{
+		uint8_t watchdog_counter = m_watchdog_counter;
+
+		if (m_nmi_enabled || !m_watchdog_enabled)
+			watchdog_counter = 0;
+		else
+			watchdog_counter = (watchdog_counter + 1) & 0xf;
+
+		if ((watchdog_counter ^ m_watchdog_counter) & 4)
+		{
+			m_maincpu->set_input_line(INPUT_LINE_RESET, watchdog_counter & 4 ? ASSERT_LINE : CLEAR_LINE);
+			m_aysnd->reset();
+		}
+
+		m_watchdog_counter = watchdog_counter;
+	}
+}
 
 /* the protection device simply returns the last two values written shifted left */
 /* by a variable amount. */
diff --git a/src/mame/includes/popeye.h b/src/mame/includes/popeye.h
index ba34a14c521..05cf375d78d 100644
--- a/src/mame/includes/popeye.h
+++ b/src/mame/includes/popeye.h
@@ -1,7 +1,8 @@
 // license:BSD-3-Clause
-// copyright-holders:Nicola Salmoria, Couriersud
+// copyright-holders:smf, Nicola Salmoria, Couriersud
 // thanks-to: Marc Lafontaine
 
+#include "sound/ay8910.h"
 #include "video/resnet.h"
 
 class tnx1_state : public driver_device
@@ -10,6 +11,7 @@ public:
 	tnx1_state(const machine_config &mconfig, device_type type, const char *tag)
 		: driver_device(mconfig, type, tag),
 		m_maincpu(*this, "maincpu"),
+		m_aysnd(*this, "aysnd"),
 		m_gfxdecode(*this, "gfxdecode"),
 		m_palette(*this, "palette"),
 		m_dmasource(*this, "dmasource"),
@@ -24,6 +26,7 @@ public:
 
 protected:
 	required_device<cpu_device> m_maincpu;
+	required_device<ay8910_device> m_aysnd;
 	required_device<gfxdecode_device> m_gfxdecode;
 	required_device<palette_device> m_palette;
 	required_shared_ptr<uint8_t> m_dmasource;
@@ -52,7 +55,7 @@ protected:
 	uint8_t m_dswbit;
 	bool m_nmi_enabled;
 
-	DECLARE_WRITE8_MEMBER(refresh_w);
+	virtual DECLARE_WRITE8_MEMBER(refresh_w);
 	DECLARE_READ8_MEMBER(protection_r);
 	DECLARE_WRITE8_MEMBER(protection_w);
 	DECLARE_WRITE8_MEMBER(popeye_videoram_w);
@@ -64,7 +67,7 @@ protected:
 	virtual void video_start() override;
 	virtual DECLARE_PALETTE_INIT(palette_init);
 	uint32_t screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
-	DECLARE_WRITE_LINE_MEMBER(screen_vblank);
+	virtual DECLARE_WRITE_LINE_MEMBER(screen_vblank);
 	void update_palette();
 	virtual void decrypt_rom();
 	virtual void draw_background(bitmap_ind16 &bitmap, const rectangle &cliprect);
@@ -97,6 +100,12 @@ class tpp2_state : public tpp1_state
 public:
 	virtual void config(machine_config &config) override;
 protected:
+	bool m_watchdog_enabled;
+	uint8_t m_watchdog_counter;
+
+	virtual void driver_start() override;
+	virtual DECLARE_WRITE8_MEMBER(refresh_w) override;
+	virtual DECLARE_WRITE_LINE_MEMBER(screen_vblank) override;
 	virtual void maincpu_program_map(address_map &map) override;
 	virtual void decrypt_rom() override;
 	virtual void draw_background(bitmap_ind16 &bitmap, const rectangle &cliprect) override;
diff --git a/src/mame/video/popeye.cpp b/src/mame/video/popeye.cpp
index e12e832ec06..b33c1ddd24a 100644
--- a/src/mame/video/popeye.cpp
+++ b/src/mame/video/popeye.cpp
@@ -1,5 +1,5 @@
 // license:BSD-3-Clause
-// copyright-holders:Nicola Salmoria, Couriersud
+// copyright-holders:smf, Nicola Salmoria, Couriersud
 // thanks-to: Marc Lafontaine
 /***************************************************************************