diff --git a/src/mame/drivers/gauntlet.cpp b/src/mame/drivers/gauntlet.cpp
index 605a8b871bf..608179bd511 100644
--- a/src/mame/drivers/gauntlet.cpp
+++ b/src/mame/drivers/gauntlet.cpp
@@ -259,7 +259,7 @@ void gauntlet_state::main_map(address_map &map)
 {
 	map.unmap_value_high();
 	map(0x000000, 0x037fff).mirror(0x280000).rom();
-	map(0x038000, 0x03ffff).mirror(0x280000).rom(); // slapstic maps here
+	map(0x038000, 0x03ffff).mirror(0x280000).bankr(m_slapstic_bank); // slapstic maps here
 	map(0x040000, 0x07ffff).mirror(0x280000).rom();
 
 	// MBUS
@@ -1651,10 +1651,24 @@ void gauntlet_state::swap_memory(void *ptr1, void *ptr2, int bytes)
 	}
 }
 
+void gauntlet_state::slapstic_tweak(offs_t offset, u16 &, u16)
+{
+	m_slapstic->slapstic_tweak(m_maincpu->space(AS_PROGRAM), (offset >> 1) & 0x3fff);
+	m_slapstic_bank->set_entry(m_slapstic->slapstic_bank());
+}
+
+void gauntlet_state::machine_reset()
+{
+	m_slapstic_bank->set_entry(m_slapstic->slapstic_bank());
+}
+
 void gauntlet_state::common_init(int vindctr2)
 {
-	uint8_t *rom = memregion("maincpu")->base();
-	m_slapstic->legacy_configure(*m_maincpu, 0x038000, 0, memregion("maincpu")->base() + 0x38000);
+	u8 *rom = memregion("maincpu")->base();
+	m_slapstic_bank->configure_entries(0, 4, rom + 0x38000, 0x2000);
+	m_maincpu->space(AS_PROGRAM).install_readwrite_tap(0x38000, 0x3ffff, 0x280000, "slapstic",
+													   [this](offs_t offset, u16 &data, u16 mem_mask) { slapstic_tweak(offset, data, mem_mask); },
+													   [this](offs_t offset, u16 &data, u16 mem_mask) { slapstic_tweak(offset, data, mem_mask); });
 
 	// swap the top and bottom halves of the main CPU ROM images
 	swap_memory(rom + 0x000000, rom + 0x008000, 0x8000);
diff --git a/src/mame/includes/gauntlet.h b/src/mame/includes/gauntlet.h
index adc945a6dfc..0ee7a83a51b 100644
--- a/src/mame/includes/gauntlet.h
+++ b/src/mame/includes/gauntlet.h
@@ -35,6 +35,7 @@ public:
 		m_tms5220(*this, "tms"),
 		m_soundctl(*this, "soundctl"),
 		m_slapstic(*this, "slapstic"),
+		m_slapstic_bank(*this, "slapstic_bank"),
 		m_gfxdecode(*this, "gfxdecode"),
 		m_screen(*this, "screen"),
 		m_playfield_tilemap(*this, "playfield"),
@@ -53,6 +54,7 @@ public:
 
 protected:
 	virtual void video_start() override;
+	virtual void machine_reset() override;
 
 private:
 	void video_int_ack_w(uint16_t data = 0);
@@ -86,6 +88,7 @@ private:
 	required_device<tms5220_device> m_tms5220;
 	required_device<ls259_device> m_soundctl;
 	required_device<atari_slapstic_device> m_slapstic;
+	required_memory_bank m_slapstic_bank;
 
 	required_device<gfxdecode_device> m_gfxdecode;
 	required_device<screen_device> m_screen;
@@ -101,6 +104,8 @@ private:
 	uint8_t           m_playfield_color_bank;
 
 	static const atari_motion_objects_config s_mob_config;
+
+	void slapstic_tweak(offs_t offset, u16 &, u16);
 };
 
 #endif // MAME_INCLUDES_GAUNTLET_H