Fixed Zumwalt banking thru the Multi-Pak.

src/devices/bus/coco/coco_multi.cpp

@@ -100,6 +100,7 @@ namespace
 		virtual void device_add_mconfig(machine_config &config) override;
 
 		virtual uint8_t* get_cart_base() override;
+		virtual uint32_t get_cart_size() override;
 
 		// these are only public so they can be in a MACHINE_CONFIG_START
 		// declaration; don't think about them as publically accessable
@@ -443,6 +444,16 @@ uint8_t* coco_multipak_device::get_cart_base()
 }
 
 
+//-------------------------------------------------
+//  get_cart_size
+//-------------------------------------------------
+
+uint32_t coco_multipak_device::get_cart_size()
+{
+	return active_cts_slot().get_cart_size();
+}
+
+
 //-------------------------------------------------
 //  scs_read
 //-------------------------------------------------

src/devices/bus/coco/coco_pak.cpp

@@ -95,6 +95,15 @@ const tiny_rom_entry *coco_pak_device::device_rom_region() const
 	return ROM_NAME( coco_pak );
 }
 
+//-------------------------------------------------
+//  get_cart_size
+//-------------------------------------------------
+
+uint32_t coco_pak_device::get_cart_size()
+{
+	return 0x8000;
+}
+
 /*-------------------------------------------------
     device_reset - device-specific startup
 -------------------------------------------------*/
@@ -121,6 +130,17 @@ uint8_t* coco_pak_device::get_cart_base()
 	return memregion(CARTSLOT_TAG)->base();
 }
 
+/*-------------------------------------------------
+    get_cart_memregion
+-------------------------------------------------*/
+
+memory_region* coco_pak_device::get_cart_memregion()
+{
+	return memregion(CARTSLOT_TAG);
+}
+
+
+
 /***************************************************************************
     BANKED CARTRIDGES
 ***************************************************************************/
@@ -199,7 +219,7 @@ uint8_t *coco_pak_banked_device::get_cart_base()
 
 uint32_t coco_pak_banked_device::get_cart_size()
 {
-	return 0x20000;
+	return 0x4000;
 }
 
 //-------------------------------------------------

src/devices/bus/coco/coco_pak.h

@@ -26,6 +26,8 @@ public:
 	virtual ioport_constructor device_input_ports() const override;
 
 	virtual uint8_t* get_cart_base() override;
+	virtual uint32_t get_cart_size() override;
+	virtual memory_region* get_cart_memregion() override;
 
 protected:
 	coco_pak_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock);

src/devices/bus/coco/cococart.cpp

@@ -387,9 +387,9 @@ uint32_t cococart_slot_device::get_cart_size()
 {
 	if (m_cart != nullptr)
 		return m_cart->get_cart_size();
-	return 0;
-}
 
+	return 0x8000;
+}
 
 //-------------------------------------------------
 //  set_cart_base_update
@@ -410,20 +410,24 @@ image_init_result cococart_slot_device::call_load()
 {
 	if (m_cart)
 	{
-		offs_t read_length;
+		memory_region *cart_mem = m_cart->get_cart_memregion();
+		uint8_t *base = cart_mem->base();
+		offs_t read_length, cart_legnth = cart_mem->bytes();;
+
 		if (!loaded_through_softlist())
 		{
-			read_length = fread(m_cart->get_cart_base(), m_cart->get_cart_size());
+			read_length = fread(base, cart_legnth);
 		}
 		else
 		{
 			read_length = get_software_region_length("rom");
-			memcpy(m_cart->get_cart_base(), get_software_region("rom"), read_length);
+			memcpy(base, get_software_region("rom"), read_length);
 		}
-		while(read_length < m_cart->get_cart_size())
+
+		while (read_length < cart_legnth)
 		{
 			offs_t len = std::min(read_length, m_cart->get_cart_size() - read_length);
-			memcpy(m_cart->get_cart_base() + read_length, m_cart->get_cart_base(), len);
+			memcpy(base + read_length, base, len);
 			read_length += len;
 		}
 	}
@@ -565,8 +569,22 @@ void device_cococart_interface::cart_base_changed(void)
 {
 	if (!m_update.isnull())
 		m_update(get_cart_base());
+	else
+	{
+		// propagate up to host interface
+		device_cococart_interface *host = dynamic_cast<device_cococart_interface*>(m_host);
+		host->cart_base_changed();
+	}
 }
 
+/*-------------------------------------------------
+    get_cart_memregion
+-------------------------------------------------*/
+
+memory_region* device_cococart_interface::get_cart_memregion()
+{
+	return 0;
+}
 
 //-------------------------------------------------
 //  cartridge_space

src/devices/bus/coco/cococart.h

@@ -114,7 +114,7 @@ public:
 
 	// cart base
 	uint8_t *get_cart_base();
-	uint32_t get_cart_size();
+	virtual uint32_t get_cart_size();
 	void set_cart_base_update(cococart_base_update_delegate update);
 
 private:
@@ -180,6 +180,8 @@ public:
 	virtual uint8_t* get_cart_base();
 	virtual uint32_t get_cart_size();
 	void set_cart_base_update(cococart_base_update_delegate update);
+	virtual memory_region* get_cart_memregion();
+
 
 	virtual void interface_config_complete() override;
 	virtual void interface_pre_start() override;