New systems marked not working

------------------------------
unknown Top game [caius]

src/mame/mame.lst

@@ -31661,6 +31661,9 @@ unkhorse                        //
 @source:misc/unkpoker.cpp
 unkpoker                         //
 
+@source:misc/unktop.cpp
+unktop
+
 @source:misc/usbilliards.cpp
 sharkusb                        // (c) 1975 US Billiards
 

src/mame/misc/unktop.cpp

@@ -0,0 +1,98 @@
+// license:BSD-3-Clause
+// copyright-holders:
+
+/*
+Unknown PCB with no marking apart from L.C. and L.S. ('lato componenti' and 'lato saldature'),
+which may point to it being manufactured in Italy.
+It was sold as Top-01 Fashion Games, which Google doesn't seem to have relevant hits for.
+
+Main components are:
+
+HD63B03XP CPU
+4.000 MHz XTAL
+NEC D7759C ADPCM speech synthesizer
+
+Maybe just the sound PCB for something else?
+*/
+
+#include "emu.h"
+
+#include "cpu/m6800/m6801.h"
+#include "sound/upd7759.h"
+
+#include "speaker.h"
+
+
+namespace {
+
+class unktop_state : public driver_device
+{
+public:
+	unktop_state(const machine_config &mconfig, device_type type, const char *tag)
+		: driver_device(mconfig, type, tag),
+		m_maincpu(*this, "maincpu")
+	{
+	}
+
+	void unktop(machine_config &config);
+
+private:
+	required_device<hd6303x_cpu_device> m_maincpu;
+
+	void program_map(address_map &map);
+};
+
+
+void unktop_state::program_map(address_map &map)
+{
+	map(0x0000, 0x001f).m(m_maincpu, FUNC(hd6303x_cpu_device::hd6301x_io));
+	map(0x0040, 0x00ff).ram(); // internal RAM
+	//map(0x6000, 0x6000).w();
+	//map(0x6800, 0x6800).w();
+	//map(0x7800, 0x7800).r();
+	map(0xe000, 0xffff).rom().region("maincpu", 0);
+}
+
+
+static INPUT_PORTS_START( unktop )
+INPUT_PORTS_END
+
+
+void unktop_state::unktop(machine_config &config)
+{
+	HD6303X(config, m_maincpu, 4_MHz_XTAL); // HD63B03XP
+	m_maincpu->set_addrmap(AS_PROGRAM, &unktop_state::program_map);
+	m_maincpu->in_p1_cb().set_log("P1 read");
+	m_maincpu->out_p1_cb().set_log("P1 write");
+	m_maincpu->in_p2_cb().set_log("P2 read");
+	m_maincpu->out_p2_cb().set_log("P2 write");
+	m_maincpu->in_p3_cb().set_log("P3 read");
+	m_maincpu->out_p3_cb().set_log("P3 write");
+	m_maincpu->in_p4_cb().set_log("P4 read");
+	m_maincpu->out_p4_cb().set_log("P4 write");
+	m_maincpu->in_p5_cb().set_log("P5 read");
+	m_maincpu->out_p5_cb().set_log("P5 write");
+	m_maincpu->in_p6_cb().set_log("P6 read");
+	m_maincpu->out_p6_cb().set_log("P6 write");
+	m_maincpu->out_p7_cb().set_log("P7 write");
+	m_maincpu->out_sc2_cb().set_log("SC2 write");
+	m_maincpu->out_ser_tx_cb().set_log("serial TX");
+
+	SPEAKER(config, "mono").front_center();
+
+	UPD7759(config, "upd").add_route(ALL_OUTPUTS, "mono", 0.50);
+}
+
+
+ROM_START( unktop ) // all labels handwritten
+	ROM_REGION(0x2000, "maincpu", 0)
+	ROM_LOAD( "top_iii", 0x0000, 0x2000, CRC(d79a697e) SHA1(c04691383d4eb7781f7d8fdd927848cc2e629152) ) // 0xxxxxxxxxxxx = 0xFF
+
+	ROM_REGION( 0x20000, "upd", 0 )
+	ROM_LOAD( "top_it", 0x00000, 0x20000, CRC(388b129b) SHA1(e2fe5c0249f3a5682f93fef30c1d113f51608582) )
+ROM_END
+
+} // anonymous namespace
+
+
+GAME( 19??, unktop, 0, unktop, unktop, unktop_state, empty_init, ROT0, "<unknown>", "unknown Top game", MACHINE_IS_SKELETON )