ti74 skeleton driver, i will flesh it out later

.gitattributes

@@ -8368,6 +8368,7 @@ src/mess/drivers/terak.c svneol=native#text/plain
 src/mess/drivers/test_t400.c svneol=native#text/plain
 src/mess/drivers/thomson.c svneol=native#text/plain
 src/mess/drivers/ti630.c svneol=native#text/plain
+src/mess/drivers/ti74.c svneol=native#text/xml
 src/mess/drivers/ti85.c svneol=native#text/plain
 src/mess/drivers/ti89.c svneol=native#text/plain
 src/mess/drivers/ti990_10.c svneol=native#text/plain
@@ -8764,6 +8765,7 @@ src/mess/layout/sym1.lay svneol=native#text/xml
 src/mess/layout/tavernie.lay svneol=native#text/xml
 src/mess/layout/tec1.lay svneol=native#text/xml
 src/mess/layout/tecnbras.lay svneol=native#text/plain
+src/mess/layout/ti74.lay svneol=native#text/xml
 src/mess/layout/tk80.lay svneol=native#text/xml
 src/mess/layout/tm990189.lay svneol=native#text/xml
 src/mess/layout/tm990189v.lay svneol=native#text/xml

src/mess/drivers/cc40.c

@@ -498,7 +498,7 @@ MACHINE_CONFIG_END
 
 /***************************************************************************
 
-  Game drivers
+  ROM Definitions
 
 ***************************************************************************/
 

src/mess/drivers/ti74.c

@@ -0,0 +1,136 @@
+// license:BSD-3-Clause
+// copyright-holders:hap
+/***************************************************************************
+
+  TI-74
+
+
+  TODO:
+  - x
+
+***************************************************************************/
+
+#include "emu.h"
+#include "cpu/tms7000/tms7000.h"
+#include "video/hd44780.h"
+
+#include "ti74.lh"
+
+
+class ti74_state : public driver_device
+{
+public:
+	ti74_state(const machine_config &mconfig, device_type type, const char *tag)
+		: driver_device(mconfig, type, tag),
+		m_maincpu(*this, "maincpu")
+	{ }
+
+	required_device<tms70c46_device> m_maincpu;
+
+	virtual void machine_reset();
+	virtual void machine_start();
+	DECLARE_PALETTE_INIT(ti74);
+};
+
+
+/***************************************************************************
+
+  Video
+
+***************************************************************************/
+
+PALETTE_INIT_MEMBER(ti74_state, ti74)
+{
+	palette.set_pen_color(0, rgb_t(138, 146, 148));
+	palette.set_pen_color(1, rgb_t(92, 83, 88));
+}
+
+
+
+/***************************************************************************
+
+  I/O, Memory Maps
+
+***************************************************************************/
+
+static ADDRESS_MAP_START( main_map, AS_PROGRAM, 8, ti74_state )
+	ADDRESS_MAP_UNMAP_HIGH
+ADDRESS_MAP_END
+
+
+
+/***************************************************************************
+
+  Inputs
+
+***************************************************************************/
+
+static INPUT_PORTS_START( ti74 )
+	PORT_START("IN0")
+	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_UNUSED )
+	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_UNUSED )
+	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_UNUSED )
+	PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_UNUSED )
+	PORT_BIT( 0x10, IP_ACTIVE_HIGH, IPT_UNUSED )
+	PORT_BIT( 0x20, IP_ACTIVE_HIGH, IPT_UNUSED )
+	PORT_BIT( 0x40, IP_ACTIVE_HIGH, IPT_UNUSED )
+	PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_UNUSED )
+INPUT_PORTS_END
+
+
+
+/***************************************************************************
+
+  Machine Config
+
+***************************************************************************/
+
+void ti74_state::machine_reset()
+{
+}
+
+void ti74_state::machine_start()
+{
+}
+
+static MACHINE_CONFIG_START( ti74, ti74_state )
+
+	/* basic machine hardware */
+	MCFG_CPU_ADD("maincpu", TMS70C46, 2500000)
+	MCFG_CPU_PROGRAM_MAP(main_map)
+
+	/* video hardware */
+	MCFG_SCREEN_ADD("screen", LCD)
+	MCFG_SCREEN_REFRESH_RATE(60) // arbitrary
+	MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500))
+	MCFG_SCREEN_SIZE(6*16, 9*2)
+	MCFG_SCREEN_VISIBLE_AREA(0, 6*16-1, 0, 9*2-1)
+	MCFG_DEFAULT_LAYOUT(layout_ti74)
+	MCFG_SCREEN_UPDATE_DEVICE("hd44780", hd44780_device, screen_update)
+	MCFG_SCREEN_PALETTE("palette")
+
+	MCFG_PALETTE_ADD("palette", 2)
+	MCFG_PALETTE_INIT_OWNER(ti74_state, ti74)
+
+	MCFG_HD44780_ADD("hd44780")
+	MCFG_HD44780_LCD_SIZE(2, 16)
+MACHINE_CONFIG_END
+
+
+
+/***************************************************************************
+
+  ROM Definitions
+
+***************************************************************************/
+
+ROM_START( ti74 )
+	ROM_REGION( 0x10000, "maincpu", 0 )
+	ROM_LOAD( "tms70c46.bin", 0xf000, 0x1000, CRC(55a2f7c0) SHA1(530e3de42f2e304c8f4805ad389f38a459ec4e33) ) // internal cpu rom
+
+	ROM_REGION( 0x8000, "system", 0 )
+	ROM_LOAD( "ti74.bin",     0x0000, 0x8000, CRC(019aaa2f) SHA1(04a1e694a49d50602e45a7834846de4d9f7d587d) ) // system rom, banked
+ROM_END
+
+
+COMP( 1986, ti74, 0, 0, ti74, ti74, driver_device, 0, "Texas Instruments", "TI-74", GAME_IS_SKELETON )

src/mess/layout/ti74.lay

@@ -0,0 +1,8 @@
+<?xml version="1.0"?>
+<mamelayout version="2">
+	<view name="Internal Layout">
+		<screen index="0">
+			<bounds left="0" top="0" right="~scr0width~" bottom="~scr0height~" />
+		</screen>
+	</view>
+</mamelayout>

src/mess/mess.lst

@@ -1049,6 +1049,7 @@ avigo_it     // 1997 Avigo (Italian)
 
 // Texas Instruments Calculators
 ti73      // 1990 TI-73
+ti74      // 1986 TI-74
 ti81      // 1990 TI-81 (Z80 2 MHz)
 ti81v2  // 1990 TI-81 (Z80 2 MHz)
 ti85      // 1992 TI-85 (Z80 6 MHz)
@@ -1066,6 +1067,10 @@ v200      // 2002 Voyage 200 PLT
 ti89t    // 2004 TI-89 Titanium
 evmbug
 
+// Exelvision (founded by former TI employees)
+exl100
+exeltel
+
 // NEC
 pc6001
 pc6001a
@@ -1849,10 +1854,6 @@ poly8813
 // Bondwell
 bw2
 
-// Exeltel
-exl100
-exeltel
-
 // Comx World Operations Ltd
 comx35p
 comx35n

src/mess/mess.mak

@@ -683,7 +683,6 @@ DRVLIBS += \
 	$(MESSOBJ)/entex.a \
 	$(MESSOBJ)/epoch.a \
 	$(MESSOBJ)/epson.a \
-	$(MESSOBJ)/exeltel.a \
 	$(MESSOBJ)/exidy.a \
 	$(MESSOBJ)/fairch.a \
 	$(MESSOBJ)/fidelity.a \
@@ -1273,9 +1272,6 @@ $(MESSOBJ)/epson.a:             \
 	$(MESS_DRIVERS)/qx10.o      \
 	$(MESS_MACHINE)/qx10kbd.o   \
 
-$(MESSOBJ)/exeltel.a:           \
-	$(MESS_DRIVERS)/exelv.o     \
-
 $(MESSOBJ)/exidy.a:             \
 	$(MESS_MACHINE)/sorcerer.o  \
 	$(MESS_DRIVERS)/sorcerer.o  \
@@ -1885,6 +1881,7 @@ $(MESSOBJ)/thomson.a:           \
 	$(MESS_MACHINE)/thomflop.o  \
 
 $(MESSOBJ)/ti.a:                \
+	$(MESS_DRIVERS)/ti74.o      \
 	$(MESS_DRIVERS)/ti85.o      \
 	$(MESS_VIDEO)/ti85.o        \
 	$(MESS_MACHINE)/ti85.o      \
@@ -1914,8 +1911,9 @@ $(MESSOBJ)/ti.a:                \
 	$(MESS_DRIVERS)/ti99_2.o    \
 	$(MESS_VIDEO)/avigo.o       \
 	$(MESS_DRIVERS)/avigo.o     \
-	$(MESS_DRIVERS)/evmbug.o    \
 	$(MESS_DRIVERS)/cc40.o      \
+	$(MESS_DRIVERS)/evmbug.o    \
+	$(MESS_DRIVERS)/exelv.o     \
 
 $(MESSOBJ)/tiger.a:             \
 	$(MESS_DRIVERS)/gamecom.o   \
@@ -2338,6 +2336,7 @@ $(MESS_DRIVERS)/sym1.o:     $(MESS_LAYOUT)/sym1.lh
 $(MESS_DRIVERS)/tavernie.o: $(MESS_LAYOUT)/tavernie.lh
 $(MESS_DRIVERS)/tec1.o:     $(MESS_LAYOUT)/tec1.lh
 $(MESS_DRIVERS)/tecnbras.o: $(MESS_LAYOUT)/tecnbras.lh
+$(MESS_DRIVERS)/ti74.o:     $(MESS_LAYOUT)/ti74.lh
 $(MESS_DRIVERS)/tk80.o:     $(MESS_LAYOUT)/tk80.lh
 $(MESS_DRIVERS)/tm990189.o: $(MESS_LAYOUT)/tm990189.lh \
 							$(MESS_LAYOUT)/tm990189v.lh