New machines marked as NOT_WORKING

----------------------------------
ADM 23 Smart Terminal [Bitsavers]

scripts/target/mame/mess.lua

@@ -3700,6 +3700,7 @@ files {
 	MAME_DIR .. "src/mame/drivers/aaa.cpp",
 	MAME_DIR .. "src/mame/drivers/acd.cpp",
 	MAME_DIR .. "src/mame/drivers/aceex.cpp",
+	MAME_DIR .. "src/mame/drivers/adm23.cpp",
 	MAME_DIR .. "src/mame/drivers/akaiax80.cpp",
 	MAME_DIR .. "src/mame/drivers/alcat7100.cpp",
 	MAME_DIR .. "src/mame/drivers/alesis_qs.cpp",

src/emu/xtal.cpp

@@ -199,6 +199,7 @@ const double XTAL::known_xtals[] = {
 	 14'318'181, /* 14.318181_MHz_XTAL     Extremely common, used on 100's of PCBs (4x NTSC subcarrier) */
 	 14'580'000, /* 14.58_MHz_XTAL         Fortune 32:16 Video Controller */
 	 14'705'882, /* 14.705882_MHz_XTAL     Aleck64 */
+	 14'742'800, /* 14.7428_MHz_XTAL       ADM 23 */
 	 14'745'600, /* 14.7456_MHz_XTAL       Namco System 12 & System Super 22/23 for JVS */
 	 14'784'000, /* 14.784_MHz_XTAL        Zenith Z-29 */
 	 14'916'000, /* 14.916_MHz_XTAL        ADDS Viewpoint 122 */

src/mame/drivers/adm23.cpp

@@ -0,0 +1,86 @@
+// license:BSD-3-Clause
+// copyright-holders:AJR
+/***************************************************************************
+
+    Skeleton driver for ADM 23 terminal.
+
+***************************************************************************/
+
+#include "emu.h"
+#include "cpu/z8/z8.h"
+#include "video/mc6845.h"
+#include "screen.h"
+
+class adm23_state : public driver_device
+{
+public:
+	adm23_state(const machine_config &mconfig, device_type type, const char *tag)
+		: driver_device(mconfig, type, tag)
+		, m_chargen(*this, "chargen")
+	{
+	}
+
+	void adm23(machine_config &config);
+
+private:
+	MC6845_UPDATE_ROW(update_row);
+	MC6845_ON_UPDATE_ADDR_CHANGED(addr_changed);
+
+	void mem_map(address_map &map);
+
+	required_region_ptr<u8> m_chargen;
+};
+
+MC6845_UPDATE_ROW(adm23_state::update_row)
+{
+}
+
+MC6845_ON_UPDATE_ADDR_CHANGED(adm23_state::addr_changed)
+{
+}
+
+void adm23_state::mem_map(address_map &map)
+{
+	map(0x0800, 0x1fff).rom().region("program", 0x0800);
+	map(0x2020, 0x2020).nopr();
+	map(0x2080, 0x2080).rw("crtc", FUNC(mc6845_device::status_r), FUNC(mc6845_device::address_w));
+	map(0x2081, 0x2081).rw("crtc", FUNC(mc6845_device::register_r), FUNC(mc6845_device::register_w));
+	map(0xc080, 0xc080).nopw();
+	map(0xd080, 0xd080).nopr();
+}
+
+
+static INPUT_PORTS_START(adm23)
+INPUT_PORTS_END
+
+
+void adm23_state::adm23(machine_config &config)
+{
+	z8_device &maincpu(Z8682(config, "maincpu", 14.7428_MHz_XTAL / 2));
+	maincpu.set_addrmap(AS_PROGRAM, &adm23_state::mem_map);
+
+	screen_device &screen(SCREEN(config, "screen", SCREEN_TYPE_RASTER));
+	screen.set_raw(14.7428_MHz_XTAL, 873, 0, 720, 281, 0, 264);
+	screen.set_screen_update("crtc", FUNC(mc6845_device::screen_update));
+
+	mc6845_device &crtc(SY6545_1(config, "crtc", 14.7428_MHz_XTAL / 9));
+	crtc.set_char_width(9);
+	crtc.set_show_border_area(false);
+	crtc.set_screen("screen");
+	crtc.set_update_row_callback(FUNC(adm23_state::update_row), this);
+	crtc.set_on_update_addr_change_callback(FUNC(adm23_state::addr_changed), this);
+}
+
+ROM_START(adm23)
+	ROM_REGION(0x2000, "program", 0) // CPU is clearly a Z8682, though its location is labeled "Z8 8681"
+	ROM_LOAD("136261-083_u9.bin", 0x0000, 0x2000, CRC(85da07e7) SHA1(a1305d0f06c7e3c6075b05ca0f11c53a901b5013))
+
+	ROM_REGION(0x0800, "chargen", 0)
+	ROM_LOAD("chr_u10.bin", 0x0000, 0x0800, CRC(cd053232) SHA1(6b4136a91d0dcd9cb5df92c54c9c30b1cb5f1974))
+
+	ROM_REGION(0x0020, "proms", 0)
+	ROM_LOAD("129253-61_u3.bin", 0x0000, 0x0020, NO_DUMP) // N82S123N at location labeled "S288"
+ROM_END
+
+
+COMP(1982, adm23, 0, 0, adm23, adm23, adm23_state, empty_init, "Lear Siegler", "ADM 23 Smart Terminal", MACHINE_IS_SKELETON)

src/mame/mame.lst

@@ -904,6 +904,9 @@ viruscl                         // (c) 2004 Access GmbH
 @source:adam.cpp
 adam                            // Coleco Adam
 
+@source:adm23.cpp
+adm23                           //
+
 @source:adp.cpp
 fashiong                        // (c) 1997
 fashiong2                       // (c) 1997

src/mame/mess.flt

@@ -20,6 +20,7 @@ acrnsys1.cpp
 acrnsys.cpp
 acvirus.cpp
 adam.cpp
+adm23.cpp
 advision.cpp
 agat.cpp
 aim65.cpp