diff --git a/hash/a2600.xml b/hash/a2600.xml
index 9b19ddf7c7c..21e1eacde42 100644
--- a/hash/a2600.xml
+++ b/hash/a2600.xml
@@ -18400,4 +18400,34 @@ Info from Atariage and Atarimania
 			</dataarea>
 		</part>
 	</software>
+
+
+<!-- Since the released cart is undumped, let us include at least these demos to test 3E bankswitch code -->
+	<software name="bdash">
+		<description>Boulder Dash (Demo v2)</description>
+		<year>2014</year>
+		<publisher>&lt;homebrew&gt;</publisher>
+		<part name="cart" interface="a2600_cart">
+			<feature name="slot" value="a26_3e" />
+			<dataarea name="rom" size="32768">
+				<rom name="boulder dash (demo 2).bin" size="32768" crc="2f7b6112" sha1="adcb4b38413ad6851a1562cacd376dbf25a4dd00" offset="0" />
+			</dataarea>
+			<dataarea name="ram" size="32768">
+			</dataarea>
+		</part>
+	</software>
+
+	<software name="bdash1" cloneof="bdash">
+		<description>Boulder Dash (Demo v1)</description>
+		<year>2011</year>
+		<publisher>&lt;homebrew&gt;</publisher>
+		<part name="cart" interface="a2600_cart">
+			<feature name="slot" value="a26_3e" />
+			<dataarea name="rom" size="32768">
+				<rom name="boulderdash100.bin" size="32768" crc="9ba60c62" sha1="660360ee11ab442d5f9db44848d3c0c99ee61e1c" offset="0" />
+			</dataarea>
+			<dataarea name="ram" size="32768">
+			</dataarea>
+		</part>
+	</software>
 </softwarelist>
diff --git a/src/emu/bus/vcs/rom.c b/src/emu/bus/vcs/rom.c
index 2953f705e2c..c83f0054e17 100755
--- a/src/emu/bus/vcs/rom.c
+++ b/src/emu/bus/vcs/rom.c
@@ -678,41 +678,36 @@ WRITE8_MEMBER(a26_rom_fe_device::write_bank)
 
 READ8_MEMBER(a26_rom_3e_device::read_rom)
 {
-	if (m_ram && m_ram_enable && offset >= 0x400 && offset < 0x600)
-	{
-		offset -= 0x400;
-		return m_ram[offset + (m_ram_bank * 0x200)];
-	}
+	if (m_ram && m_ram_enable && offset < 0x400)
+		return m_ram[offset + (m_ram_bank * 0x400)];
 	
 	if (offset >= 0x800)
-		return m_rom[offset + (m_num_bank - 1) * 0x800];
+		return m_rom[(offset & 0x7ff) + (m_num_bank - 1) * 0x800];
 	else
 		return m_rom[offset + m_base_bank * 0x800];
 }
 
 WRITE8_MEMBER(a26_rom_3e_device::write_bank)
 {
-	if (offset)	// 0x3f
+	if (offset == 0x3f)
 	{
 		m_base_bank = data & (m_num_bank - 1);
 		m_ram_enable = 0;
 	}
-	else	// 0x3e
+	else if (offset == 0x3e)
 	{
-		m_ram_bank = data & 0x3f;
+		m_ram_bank = data & 0x1f;
 		m_ram_enable = 1;
 	}
 }
 
 WRITE8_MEMBER(a26_rom_3e_device::write_ram)
 {
-	if (m_ram && m_ram_enable && offset >= 0x400 && offset < 0x600)
-	{
-		offset -= 0x400;
-		m_ram[offset + (m_ram_bank * 0x200)] = data;
-	}
+	if (m_ram && m_ram_enable && offset >= 0x400 && offset < 0x800)
+		m_ram[(offset & 0x3ff) + (m_ram_bank * 0x400)] = data;
 }
 
+
 /*-------------------------------------------------
  "3F Bankswitch" Carts: 
  write access to 0x00-0x3f determines the 2K ROM bank 
diff --git a/src/mess/drivers/a2600.c b/src/mess/drivers/a2600.c
index c2f2dfea7cc..ab7ac4d4220 100644
--- a/src/mess/drivers/a2600.c
+++ b/src/mess/drivers/a2600.c
@@ -33,6 +33,7 @@ public:
 		m_joy1(*this, CONTROL1_TAG),
 		m_joy2(*this, CONTROL2_TAG) ,
 		m_cartslot(*this, "cartslot"),
+		m_tia(*this, "tia_video"),
 		m_maincpu(*this, "maincpu"),
 		m_screen(*this, "screen") { }
 
@@ -49,6 +50,7 @@ public:
 	DECLARE_READ8_MEMBER(a2600_get_databus_contents);
 	DECLARE_WRITE16_MEMBER(a2600_tia_vsync_callback);
 	DECLARE_WRITE16_MEMBER(a2600_tia_vsync_callback_pal);
+	DECLARE_WRITE8_MEMBER(cart_over_tia_w);
 	// investigate how the carts mapped here (Mapper JVP) interact with the RIOT device
 	DECLARE_READ8_MEMBER(cart_over_riot_r);
 	DECLARE_WRITE8_MEMBER(cart_over_riot_w);
@@ -57,6 +59,7 @@ protected:
 	required_device<vcs_control_port_device> m_joy1;
 	required_device<vcs_control_port_device> m_joy2;
 	required_device<vcs_cart_slot_device> m_cartslot;
+	required_device<tia_video_device> m_tia;
 
 	unsigned long detect_2600controllers();
 	required_device<m6502_device> m_maincpu;
@@ -246,6 +249,15 @@ WRITE8_MEMBER(a2600_state::cart_over_riot_w)
 	
 }
 
+WRITE8_MEMBER(a2600_state::cart_over_tia_w)
+{
+	// Both Cart & TIA see these addresses
+	if (m_cartslot)
+		m_cartslot->write_bank(space, offset, data);
+	
+	m_tia->write(space, offset, data);	
+}
+
 MACHINE_START_MEMBER(a2600_state,a2600)
 {
 	m_current_screen_height = m_screen->height();
@@ -279,11 +291,11 @@ MACHINE_START_MEMBER(a2600_state,a2600)
 			break;
 		case A26_3E:
 			m_maincpu->space(AS_PROGRAM).install_readwrite_handler(0x1000, 0x1fff, read8_delegate(FUNC(vcs_cart_slot_device::read_rom),(vcs_cart_slot_device*)m_cartslot), write8_delegate(FUNC(vcs_cart_slot_device::write_ram),(vcs_cart_slot_device*)m_cartslot));
-			m_maincpu->space(AS_PROGRAM).install_write_handler(0x3e, 0x3f, write8_delegate(FUNC(vcs_cart_slot_device::write_bank),(vcs_cart_slot_device*)m_cartslot));
+			m_maincpu->space(AS_PROGRAM).install_write_handler(0x00, 0x3f, write8_delegate(FUNC(a2600_state::cart_over_tia_w), this));
 			break;
 		case A26_3F:
 			m_maincpu->space(AS_PROGRAM).install_read_handler(0x1000, 0x1fff, read8_delegate(FUNC(vcs_cart_slot_device::read_rom),(vcs_cart_slot_device*)m_cartslot));
-			m_maincpu->space(AS_PROGRAM).install_write_handler(0x00, 0x3f, write8_delegate(FUNC(vcs_cart_slot_device::write_bank),(vcs_cart_slot_device*)m_cartslot));
+			m_maincpu->space(AS_PROGRAM).install_write_handler(0x00, 0x3f, write8_delegate(FUNC(a2600_state::cart_over_tia_w), this));
 			break;
 		case A26_UA:
 			m_maincpu->space(AS_PROGRAM).install_read_handler(0x1000, 0x1fff, read8_delegate(FUNC(vcs_cart_slot_device::read_rom),(vcs_cart_slot_device*)m_cartslot));