(MESS) vc4000: properly supported 4K carts with no RAM. [Fabio Priuli]

hash/database.xml

@@ -157,8 +157,7 @@
 		<publisher>Voltmace?</publisher>
 		<info name="serial" value="No.13"/>
 		<part name="cart" interface="vc4000_cart">
-			<!-- FIXME: PCB has no RAM, but 4k ROM => it needs a new slot option -->
+			<feature name="slot" value="rom4k" />
-			<feature name="slot" value="std" />
 			<dataarea name="rom" size="4096">
 				<rom name="boxing.bin" size="4096" crc="922c9f0d" sha1="b49a37dd6d0272f6c71d778ffada6bc7c90f8348" offset="0" />
 			</dataarea>
@@ -229,8 +228,7 @@
 		<publisher>Voltmace?</publisher>
 		<info name="serial" value="No.24"/>
 		<part name="cart" interface="vc4000_cart">
-			<!-- FIXME: PCB has no RAM, but 4k ROM => it needs a new slot option -->
+			<feature name="slot" value="rom4k" />
-			<feature name="slot" value="std" />
 			<dataarea name="rom" size="4096">
 				<rom name="munchcrn.bin" size="4096" crc="704a1593" sha1="5f0b95904d6d36368727c1e0c91d94627a7471d6" offset="0" />
 			</dataarea>

hash/vc4000.xml

@@ -236,12 +236,10 @@
 		<publisher>Interton</publisher>
 		<info name="serial" value="18"/>
 		<part name="cart" interface="vc4000_cart">
-			<feature name="slot" value="ram1k" />
+			<feature name="slot" value="rom4k" />
 			<dataarea name="rom" size="4096">
 				<rom name="boxing.bin" size="4096" crc="922c9f0d" sha1="b49a37dd6d0272f6c71d778ffada6bc7c90f8348" offset="0" />
 			</dataarea>
-			<dataarea name="ram" size="1024">
-			</dataarea>
 		</part>
 	</software>
 

src/emu/bus/vc4000/rom.c

@@ -193,6 +193,7 @@
 //-------------------------------------------------
 
 const device_type VC4000_ROM_STD = &device_creator<vc4000_rom_device>;
+const device_type VC4000_ROM_ROM4K = &device_creator<vc4000_rom4k_device>;
 const device_type VC4000_ROM_RAM1K = &device_creator<vc4000_ram1k_device>;
 const device_type VC4000_ROM_CHESS2 = &device_creator<vc4000_chess2_device>;
 
@@ -209,6 +210,11 @@ vc4000_rom_device::vc4000_rom_device(const machine_config &mconfig, const char *
 {
 }
 
+vc4000_rom4k_device::vc4000_rom4k_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
+					: vc4000_rom_device(mconfig, VC4000_ROM_ROM4K, "VC 4000 Carts w/4K ROM", tag, owner, clock, "vc4000_rom4k", __FILE__)
+{
+}
+
 vc4000_ram1k_device::vc4000_ram1k_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
 					: vc4000_rom_device(mconfig, VC4000_ROM_RAM1K, "VC 4000 Carts w/1K RAM", tag, owner, clock, "vc4000_ram1k", __FILE__)
 {

src/emu/bus/vc4000/rom.h

@@ -24,6 +24,15 @@ public:
 	virtual DECLARE_READ8_MEMBER(read_rom);
 };
 
+// ======================> vc4000_rom4k_device
+
+class vc4000_rom4k_device : public vc4000_rom_device
+{
+public:
+	// construction/destruction
+	vc4000_rom4k_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
+};
+
 // ======================> vc4000_ram1k_device
 
 class vc4000_ram1k_device : public vc4000_rom_device
@@ -57,6 +66,7 @@ public:
 
 // device type definition
 extern const device_type VC4000_ROM_STD;
+extern const device_type VC4000_ROM_ROM4K;
 extern const device_type VC4000_ROM_RAM1K;
 extern const device_type VC4000_ROM_CHESS2;
 

src/emu/bus/vc4000/slot.c

@@ -127,6 +127,7 @@ struct vc4000_slot
 static const vc4000_slot slot_list[] =
 {
 	{ VC4000_STD,     "std" },
+	{ VC4000_ROM4K,   "rom4k" },
 	{ VC4000_RAM1K,   "ram1k" },
 	{ VC4000_CHESS2,  "chess2" }
 };
@@ -183,7 +184,7 @@ bool vc4000_cart_slot_device::call_load()
 			// attempt to identify the non-standard types
 			if (size > 0x1000)  // 6k rom + 1k ram - Chess2 only
 				m_type = VC4000_CHESS2;
-			else if (size > 0x0800) // some 4k roms have 1k of mirrored ram
+			else if (size > 0x0800) // some 4k roms have 1k of mirrored ram (those who don't still work with RAM emulated luckily)
 				m_type = VC4000_RAM1K;
 
 			if (m_type == VC4000_RAM1K || m_type == VC4000_CHESS2)

src/emu/bus/vc4000/slot.h

@@ -12,6 +12,7 @@
 enum
 {
 	VC4000_STD = 0,
+	VC4000_ROM4K,
 	VC4000_RAM1K,
 	VC4000_CHESS2
 };

src/mess/drivers/vc4000.c

@@ -369,6 +369,9 @@ void vc4000_state::machine_start()
 			case VC4000_STD:
 				m_maincpu->space(AS_PROGRAM).install_read_handler(0x0000, 0x07ff, read8_delegate(FUNC(vc4000_cart_slot_device::read_rom),(vc4000_cart_slot_device*)m_cart));
 				break;
+			case VC4000_ROM4K:
+				m_maincpu->space(AS_PROGRAM).install_read_handler(0x0000, 0x0fff, read8_delegate(FUNC(vc4000_cart_slot_device::read_rom),(vc4000_cart_slot_device*)m_cart));
+				break;
 			case VC4000_RAM1K:
 				m_maincpu->space(AS_PROGRAM).install_read_handler(0x0000, 0x0fff, read8_delegate(FUNC(vc4000_cart_slot_device::read_rom),(vc4000_cart_slot_device*)m_cart));
 				m_maincpu->space(AS_PROGRAM).install_readwrite_handler(0x1000, 0x15ff, read8_delegate(FUNC(vc4000_cart_slot_device::read_ram),(vc4000_cart_slot_device*)m_cart), write8_delegate(FUNC(vc4000_cart_slot_device::write_ram),(vc4000_cart_slot_device*)m_cart));
@@ -513,6 +516,7 @@ QUICKLOAD_LOAD_MEMBER( vc4000_state,vc4000)
 
 static SLOT_INTERFACE_START(vc4000_cart)
 	SLOT_INTERFACE_INTERNAL("std",      VC4000_ROM_STD)
+	SLOT_INTERFACE_INTERNAL("rom4k",    VC4000_ROM_ROM4K)
 	SLOT_INTERFACE_INTERNAL("ram1k",    VC4000_ROM_RAM1K)
 	SLOT_INTERFACE_INTERNAL("chess2",   VC4000_ROM_CHESS2)
 SLOT_INTERFACE_END