trs/mc10.cpp: Add "Multiport" cartridge and RAM expansion for the Mat…

…ra & Hachette Alice (#12080)

scripts/src/bus.lua

@@ -2079,6 +2079,8 @@ if (BUSES["MC10"]~=null) then
 		MAME_DIR .. "src/devices/bus/mc10/pak.h",
 		MAME_DIR .. "src/devices/bus/mc10/ram.cpp",
 		MAME_DIR .. "src/devices/bus/mc10/ram.h",
+		MAME_DIR .. "src/devices/bus/mc10/multiports_ext.cpp",
+		MAME_DIR .. "src/devices/bus/mc10/multiports_ext.h",
 	}
 end
 

src/devices/bus/mc10/mc10_cart.cpp

@@ -27,6 +27,10 @@
         16  A3                 33  GND
         17  A5                 34  GND
 
+	Alice 32 and Alice 90 have 2 more pins:
+		35  IRQ (optional)
+		36  SOUND
+
     SEL is an input to the MC-10 that allows the cartridge to remove
     the internal chips from the bus.
 
@@ -38,6 +42,7 @@
 #include "mcx128.h"
 #include "pak.h"
 #include "ram.h"
+#include "multiports_ext.h"
 
 //#define VERBOSE 1
 #include "logmacro.h"
@@ -104,6 +109,8 @@ std::pair<std::error_condition, std::string> mc10cart_slot_device::call_load()
 				util::string_format("Unsupported cartridge size (must be no more than %u bytes)", m_cart->max_rom_length()));
 	}
 
+	// TODO: add the min_rom_length() method to the interface
+
 	if (!loaded_through_softlist())
 	{
 		LOG("Allocating %u byte cartridge ROM region\n", len);
@@ -198,6 +205,7 @@ void mc10_cart_add_basic_devices(device_slot_interface &device)
 	device.option_add("mcx128", MC10_PAK_MCX128);
 	device.option_add("pak", MC10_PAK);
 	device.option_add("ram", MC10_PAK_RAM);
+	device.option_add("multi", ALICE_MULTIPORTS_EXT);
 }
 
 //-------------------------------------------------
@@ -210,6 +218,7 @@ void alice_cart_add_basic_devices(device_slot_interface &device)
 	device.option_add("alice128", ALICE_PAK_MCX128);
 	device.option_add("pak", MC10_PAK);
 	device.option_add("ram", MC10_PAK_RAM);
+	device.option_add("multi", ALICE_MULTIPORTS_EXT);
 }
 
 //-------------------------------------------------
@@ -221,4 +230,5 @@ void alice32_cart_add_basic_devices(device_slot_interface &device)
 	// basic devices
 	device.option_add("pak", MC10_PAK);
 	device.option_add("ram", MC10_PAK_RAM);
+	device.option_add("multi", ALICE_MULTIPORTS_EXT);
 }

src/devices/bus/mc10/multiports_ext.cpp

@@ -0,0 +1,133 @@
+/***************************************************************************
+
+	multiports_ext.cpp
+
+	Emulation of the Alice Multiports Extension
+
+	Features:
+		The extension provides an extension doubler and two joystick ports.
+
+		The extension also provides (for the whole Alice family and MC-10):
+		- 16K of RAM expansion ($5000-$8FFF)
+		- 64K of ROM expansion in two possible configurations:
+			- 8K of ROM between $1000 and $2FFF, as 8 banks (Cartridge mode).
+			- 16K of ROM between $C000 and $FFFF, as 4 banks (ROM mode).
+
+		Only the RAM/ROM expansion is emulated here.
+
+	Banks are selected by writing to:
+		- $1000 to $1FFF in Cartridge mode (number of bank between 0 and 7)
+		- $C000 to $CFFF in ROM mode (number of bank between 0 and 3)
+
+***************************************************************************/
+
+#include "emu.h"
+#include "multiports_ext.h"
+
+//**************************************************************************
+//  TYPE DECLARATIONS
+//**************************************************************************
+
+class mc10_multiports_ext_device : public device_t,
+								   public device_mc10cart_interface
+{
+public:
+	mc10_multiports_ext_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock);
+
+	virtual int max_rom_length() const override;
+	virtual std::pair<std::error_condition, std::string> load() override;
+
+protected:
+	mc10_multiports_ext_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, u32 clock);
+
+	// device_t implementation
+	virtual void device_start() override;
+	virtual void device_reset() override;
+	virtual void device_post_load() override;
+
+	void control_register_write(offs_t offset, u8 data);
+
+	void multiports_mem(address_map &map);
+	void update_bank();
+
+private:
+	memory_bank_creator m_bank;
+	uint8_t rom_bank_index;
+	memory_share_creator<u8> m_extention_ram;
+};
+
+DEFINE_DEVICE_TYPE_PRIVATE(ALICE_MULTIPORTS_EXT, device_mc10cart_interface, mc10_multiports_ext_device, "mc10_multiports_ext", "Fred_72 and 6502man's Multiports Extension")
+
+//-------------------------------------------------
+//   IMPLEMENTATION
+//-------------------------------------------------
+
+mc10_multiports_ext_device::mc10_multiports_ext_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock)
+	: mc10_multiports_ext_device(mconfig, ALICE_MULTIPORTS_EXT, tag, owner, clock)
+{
+}
+
+mc10_multiports_ext_device::mc10_multiports_ext_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, u32 clock)
+	: device_t(mconfig, type, tag, owner, clock), device_mc10cart_interface(mconfig, *this), m_bank(*this, "cart_bank"), rom_bank_index(0), m_extention_ram(*this, "ext_ram", 1024 * 16, ENDIANNESS_BIG)
+{
+}
+
+int mc10_multiports_ext_device::max_rom_length() const
+{
+	return 1024 * 64;
+}
+
+void mc10_multiports_ext_device::multiports_mem(address_map &map)
+{
+	map(0x0000, 0x1fff).bankr("cart_bank").w(FUNC(mc10_multiports_ext_device::control_register_write));
+}
+
+//-------------------------------------------------
+
+void mc10_multiports_ext_device::device_start()
+{
+	save_item(NAME(rom_bank_index));
+
+	owning_slot().memspace().install_device(0x1000, 0x2fff, *this, &mc10_multiports_ext_device::multiports_mem);
+	owning_slot().memspace().install_ram(0x5000, 0x8fff, &m_extention_ram[0]);
+}
+
+//-------------------------------------------------
+
+void mc10_multiports_ext_device::device_reset()
+{
+	rom_bank_index = 0;
+	update_bank();
+}
+
+void mc10_multiports_ext_device::device_post_load()
+{
+	update_bank();
+}
+
+void mc10_multiports_ext_device::control_register_write(offs_t offset, u8 data)
+{
+	if (offset < 0x1000)
+	{
+		rom_bank_index = data & 0x07;
+		update_bank();
+	}
+}
+
+void mc10_multiports_ext_device::update_bank()
+{
+	m_bank.target()->set_entry(rom_bank_index);
+}
+
+std::pair<std::error_condition, std::string> mc10_multiports_ext_device::load()
+{
+	memory_region *const romregion(memregion("^rom"));
+	if (!romregion)
+	{
+		return std::make_pair(image_error::BADSOFTWARE, "Software item lacks 'rom' data area");
+	}
+
+	m_bank.target()->configure_entries(0, 8, romregion->base(), 0x2000);
+
+	return std::make_pair(std::error_condition(), std::string());
+}

src/devices/bus/mc10/multiports_ext.h

@@ -0,0 +1,12 @@
+#ifndef MAME_BUS_MC10_MULTIPORTS_EXT_H
+#define MAME_BUS_MC10_MULTIPORTS_EXT_H
+
+#pragma once
+
+#include "mc10_cart.h"
+
+// device type definition
+DECLARE_DEVICE_TYPE(ALICE_MULTIPORTS_EXT, device_mc10cart_interface)
+
+#endif // MAME_BUS_MC10_MC10_MULTIPORTS_EXT_H
+