New machine added as MACHINE_NOT_WORKING:

- GMX Micro 20 [Al Kossow, R. Belmont]

scripts/target/mame/mess.lua

@@ -3303,6 +3303,7 @@ files {
 	MAME_DIR .. "src/mame/drivers/mes.cpp",
 	MAME_DIR .. "src/mame/drivers/mice.cpp",
 	MAME_DIR .. "src/mame/drivers/micral.cpp",
+	MAME_DIR .. "src/mame/drivers/micro20.cpp",
 	MAME_DIR .. "src/mame/drivers/micronic.cpp",
 	MAME_DIR .. "src/mame/includes/micronic.h",
 	MAME_DIR .. "src/mame/drivers/mini2440.cpp",

src/mame/drivers/micro20.cpp

@@ -0,0 +1,109 @@
+// license:BSD-3-Clause
+// copyright-holders: R. Belmont
+/****************************************************************************
+
+    micro20.cpp
+    GMX Micro 20 single-board computer
+    
+    68020 + 68881 FPU
+    
+
+****************************************************************************/
+
+#include "emu.h"
+#include "cpu/m68000/m68000.h"
+#include "machine/mc68681.h"
+#include "machine/msm58321.h"
+#include "machine/wd_fdc.h"
+#include "softlist.h"
+
+#define MAINCPU_TAG "maincpu"
+#define DUART_A_TAG "duarta"
+#define DUART_B_TAG "duartb"
+#define RTC_TAG		"rtc"
+#define FDC_TAG		"fdc"
+
+class micro20_state : public driver_device
+{
+public:
+	micro20_state(const machine_config &mconfig, device_type type, const char *tag)
+		: driver_device(mconfig, type, tag),
+		m_maincpu(*this, "maincpu"),
+		m_rom(*this, "bootrom"),
+		m_mainram(*this, "mainram")
+	{
+	}
+
+	required_device<cpu_device> m_maincpu;
+	required_memory_region m_rom;
+	required_shared_ptr<uint32_t> m_mainram;
+	
+	virtual void machine_start() override;
+	virtual void machine_reset() override;
+	
+private:
+
+};
+
+void micro20_state::machine_start()
+{
+}
+
+void micro20_state::machine_reset()
+{
+	uint32_t *pROM = (uint32_t *)m_rom->base();
+	uint32_t *pRAM = (uint32_t *)m_mainram.target();
+	
+	pRAM[0] = pROM[0];
+	pRAM[1] = pROM[1];
+	m_maincpu->reset();
+}
+
+/***************************************************************************
+    ADDRESS MAPS
+***************************************************************************/
+
+static ADDRESS_MAP_START(micro20_map, AS_PROGRAM, 32, micro20_state )
+	AM_RANGE(0x000000, 0x1fffff) AM_RAM AM_SHARE("mainram")
+	AM_RANGE(0x800000, 0x83ffff) AM_ROM AM_REGION("bootrom", 0)
+ADDRESS_MAP_END
+
+static MACHINE_CONFIG_START( micro20, micro20_state )
+	/* basic machine hardware */
+	MCFG_CPU_ADD(MAINCPU_TAG, M68020, XTAL_16_67MHz)
+	MCFG_CPU_PROGRAM_MAP(micro20_map)
+	
+	MCFG_MC68681_ADD(DUART_A_TAG, XTAL_3_6864MHz)
+//	MCFG_MC68681_IRQ_CALLBACK(WRITELINE(vt240_state, irq13_w))
+//	MCFG_MC68681_A_TX_CALLBACK(DEVWRITELINE("host", rs232_port_device, write_txd))
+//	MCFG_MC68681_B_TX_CALLBACK(DEVWRITELINE("printer", rs232_port_device, write_txd))
+//	MCFG_MC68681_OUTPORT_CALLBACK(WRITE8(vt240_state, duartout_w))
+
+	MCFG_MC68681_ADD(DUART_B_TAG, XTAL_3_6864MHz)
+	
+	MCFG_DEVICE_ADD(RTC_TAG, MSM58321, XTAL_32_768kHz)
+	
+	MCFG_WD1772_ADD(FDC_TAG, XTAL_16_67MHz / 2)
+MACHINE_CONFIG_END
+
+static INPUT_PORTS_START( micro20 )
+INPUT_PORTS_END
+
+/***************************************************************************
+
+  Machine driver(s)
+
+***************************************************************************/
+
+
+ROM_START( micro20 )
+	ROM_REGION32_BE(0x40000, "bootrom", 0)
+	ROM_LOAD32_BYTE( "d00-07_u6_6791.bin",  0x000003, 0x010000, CRC(63d66ea1) SHA1(c5dfbc4d81920e1d2e981c52c1af3d486d382a35) ) 
+	ROM_LOAD32_BYTE( "d08-15_u8_0dc6.bin",  0x000002, 0x010000, CRC(d62ef21f) SHA1(2779d430b1a0b835807627e707d46547b29ef579) ) 
+	ROM_LOAD32_BYTE( "d16-23_u10_e5b0.bin", 0x000001, 0x010000, CRC(cd7acf86) SHA1(db994ed714a1079fbb66616355e8f18d2d1a2005) ) 
+	ROM_LOAD32_BYTE( "d24-31_u13_d115.bin", 0x000000, 0x010000, CRC(3646d943) SHA1(97ee54063e2fe49fef2ff68d0f2e39345a75eac5) ) 
+ROM_END
+
+COMP( 1984, micro20,  0,        0,      micro20,  micro20, driver_device, 0,  "GMX", "Micro 20",  MACHINE_NOT_WORKING | MACHINE_NO_SOUND )
+
+

src/mame/mame.lst

@@ -20118,6 +20118,9 @@ mice                            //
 @source:micral.cpp
 micral                          //
 
+@source:micro20.cpp
+micro20							// (c) 1984 GMX
+
 @source:micro3d.cpp
 botss                           // (c) 1992 Microprose Games Inc.
 botss11                         // (c) 1992 Microprose Games Inc.

src/mame/mess.flt

@@ -333,6 +333,7 @@ mephisto.cpp
 mes.cpp
 mice.cpp
 micral.cpp
+micro20.cpp
 microdec.cpp
 microkit.cpp
 micronic.cpp