new NOT WORKING machines (Lexibook) (#5989)

* new NOT WORKING machines
---
Lexibook JG7425 221-in-1 [TeamEurope]

* comments (nw)

* acknowledge that there is S+Core code in here at least (nw)

* mapping the code from ROM to RAM at 500000 after skipping the first 0x20 bytes means a lot of jumps go to the word after a 'br r3' so is probably where it gets copied to

scripts/target/mame/mess.lua

@@ -3754,6 +3754,7 @@ files {
 	MAME_DIR .. "src/mame/machine/xavix2002_io.h",
 	MAME_DIR .. "src/mame/drivers/xavix2.cpp",
 	MAME_DIR .. "src/mame/drivers/titan_soc.cpp",
+	MAME_DIR .. "src/mame/drivers/lexibook_jg7425.cpp",
 }
 
 createMESSProjects(_target, _subtarget, "ultimachine")

src/mame/drivers/lexibook_jg7425.cpp

@@ -0,0 +1,109 @@
+// license:BSD-3-Clause
+// copyright-holders:David Haywood
+
+
+/*
+
+a 221 games console which uses a 4GB sd-card for gamestorage and a MX29LV160 flashrom for the internal bios. (only 512kb are used from the 2mb romspace)
+Starting the console without SD-Card just show's a looping video with "Please insert Memory Card".
+
+SD card image produced with WinHex (hardware write blocker used to prevent Windows from corrupting data)
+compressed with "chdman createhd -i 4GBSD.img -o lexibook_jg7425_4gbsd.chd" (is this correct?)
+
+TODO:
+is there an internal ROM / bootstrap area, or does this SunPlus core use vectors in a different way to the one in hyperscan.cpp?
+If SPG290, should probably be merged with hyperscan.cpp
+
+(only noteworthy features of PCB are ROM + RAM + Cpu Glob)
+
+*/
+
+#include "emu.h"
+#include "screen.h"
+#include "cpu/score/score.h"
+
+class lexibook_jg7425_state : public driver_device
+{
+public:
+	lexibook_jg7425_state(const machine_config &mconfig, device_type type, const char *tag) :
+		driver_device(mconfig, type, tag),
+		m_maincpu(*this, "maincpu"),
+		m_screen(*this, "screen"),
+		m_mainram(*this, "mainram"),
+		m_romregion(*this, "maincpu")
+	{ }
+
+	void lexibook_jg7425(machine_config &config);
+
+	void map(address_map& map);
+
+protected:
+	uint32_t screen_update(screen_device& screen, bitmap_rgb32& bitmap, const rectangle& cliprect);
+
+private:
+	virtual void machine_start() override;
+	virtual void machine_reset() override;
+
+	required_device<score7_cpu_device> m_maincpu;
+	required_device<screen_device> m_screen;
+	required_shared_ptr<uint32_t> m_mainram;
+	required_region_ptr<uint32_t> m_romregion;
+};
+
+
+
+void lexibook_jg7425_state::machine_start()
+{
+	// I think this code should be running from RAM at least, probably some kind of bootstrap / internal ROM to copy it? (hyperscan.cpp indicates that SoC can have internal ROM at least)
+	
+	// first 0x20 bytes are probably pointers, code starts at 0x20 and is offset, maps at 0x500000
+	
+	for (int i = 0; i < 0x80000 / 4; i++)
+	{
+		m_mainram[i+(0x500000/4) - (0x20/4)] = m_romregion[i];
+	}
+}
+
+void lexibook_jg7425_state::machine_reset()
+{
+}
+
+static INPUT_PORTS_START( lexibook_jg7425 )
+INPUT_PORTS_END
+
+
+uint32_t lexibook_jg7425_state::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
+{
+	return 0;
+}
+
+void lexibook_jg7425_state::map(address_map &map)
+{
+	map(0x00000000, 0x00ffffff).ram().share("mainram");
+
+	map(0x9f000000, 0x9fffffff).ram().share("mainram");
+}
+
+
+void lexibook_jg7425_state::lexibook_jg7425(machine_config &config)
+{
+	/* basic machine hardware */
+	SCORE7(config, m_maincpu, XTAL(27'000'000) * 4);   // ? not certain on exact type
+	m_maincpu->set_addrmap(AS_PROGRAM, &lexibook_jg7425_state::map);
+
+	SCREEN(config, m_screen, SCREEN_TYPE_RASTER);
+	m_screen->set_refresh_hz(60);
+	m_screen->set_size(320, 262);
+	m_screen->set_visarea(0, 320-1, 0, 240-1);
+	m_screen->set_screen_update(FUNC(lexibook_jg7425_state::screen_update));
+}
+
+ROM_START( lx_jg7425 )
+	ROM_REGION( 0x200000, "maincpu", ROMREGION_32BIT | ROMREGION_LE )
+	ROM_LOAD32_DWORD( "mx29lv160.u6", 0x000000, 0x200000, CRC(43c90080) SHA1(4c9e5c8f880d40bd684357ce67ae45c3f5d24b62) )
+	
+	DISK_REGION( "ata:0:hdd:image" ) /* 4GB SD Card */
+	DISK_IMAGE( "lexibook_jg7425_4gbsd", 0, SHA1(dc0985103edec3992efdd493feef6185daedb3fd) )
+ROM_END
+
+CONS( 2015, lx_jg7425,   0,         0,      lexibook_jg7425,   lexibook_jg7425, lexibook_jg7425_state, empty_init, "Lexibook", "Lexibook JG7425 221-in-1", MACHINE_IS_SKELETON )

src/mame/mame.lst

@@ -18848,6 +18848,9 @@ lethalj                         // (c) 1996 The Game Room
 ripribit                        // (c) 1997 LAI Games
 ripribita                       // (c) 1997 LAI Games
 
+@source:lexibook_jg7425.cpp
+lx_jg7425
+
 @source:lft.cpp
 lft1230                         //
 lft1510                         //

src/mame/mess.flt

@@ -371,6 +371,7 @@ ibmpcjr.cpp
 icatel.cpp
 icebox.cpp
 ie15.cpp
+lx_jg7425.cpp
 if800.cpp
 ikt5a.cpp
 imds2.cpp