New machines marked as NOT_WORKING

----------------------------------
ADM-31 Data Display Terminal [Bitsavers]

scripts/target/mame/mess.lua

@@ -3711,6 +3711,7 @@ files {
 	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/adm31.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

@@ -249,6 +249,7 @@ const double XTAL::known_xtals[] = {
 	 18'720'000, /* 18.72_MHz_XTAL         Nokia MikroMikko 1 */
 	 18'869'600, /* 18.8696_MHz_XTAL       Memorex 2178 */
 	 19'339'600, /* 19.3396_MHz_XTAL       TeleVideo TVI-955 80-column display clock */
+	 19'584'000, /* 19.584_MHz_XTAL        ADM-42 */
 	 19'600'000, /* 19.6_MHz_XTAL          Universal Mr. Do - Model 8021 PCB */
 	 19'602'000, /* 19.602_MHz_XTAL        Ampex 210+ 80-column display clock */
 	 19'660'800, /* 19.6608_MHz_XTAL       Euro League (bootleg), labeled as "UKI 19.6608 20PF" */

src/mame/drivers/adm31.cpp

@@ -0,0 +1,145 @@
+// license:BSD-3-Clause
+// copyright-holders:AJR
+/****************************************************************************
+
+    Skeleton driver for ADM-31 terminal.
+
+    The ADM-31 and ADM-42 Data Display Terminals were Lear Siegler, Inc.'s
+    first microprocessor-based video terminals, introduced in 1978 as the
+    respective successors to their earlier ADM-1A and ADM-2 "smart"
+    terminals. The original ADM-31 model was apparently rebranded in 1980
+    as the ADM-31 Intermediate Terminal, and the ADM-32 was released a few
+    months later.
+
+    While the ADM-31 and ADM-32 only support 2 pages of display memory, the
+    ADM-42 could be upgraded to 8. Enhancements over the ADM-31 offered by
+    both the ADM-42 and ADM-32 include a status line, a larger monitor and
+    a detachable keyboard. Several other expansion options were offered for
+    the ADM-42, including synchronous serial and parallel printer ports.
+
+****************************************************************************/
+
+#include "emu.h"
+//#include "bus/rs232/rs232.h"
+#include "cpu/m6800/m6800.h"
+#include "machine/com8116.h"
+#include "machine/input_merger.h"
+#include "machine/6821pia.h"
+#include "machine/6850acia.h"
+#include "video/tms9927.h"
+#include "screen.h"
+
+class adm31_state : public driver_device
+{
+public:
+	adm31_state(const machine_config &mconfig, device_type type, const char *tag)
+		: driver_device(mconfig, type, tag)
+		, m_maincpu(*this, "maincpu")
+		, m_acia(*this, "acia%u", 1U)
+		, m_vtac(*this, "vtac")
+		, m_chargen(*this, "chargen")
+	{
+	}
+
+	void adm31(machine_config &mconfig);
+
+protected:
+	virtual void machine_start() override;
+
+private:
+	u32 screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect);
+
+	void mem_map(address_map &map);
+
+	required_device<cpu_device> m_maincpu;
+	required_device_array<acia6850_device, 2> m_acia;
+	required_device<crt5027_device> m_vtac;
+	required_region_ptr<u8> m_chargen;
+};
+
+
+void adm31_state::machine_start()
+{
+}
+
+
+u32 adm31_state::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
+{
+	return 0;
+}
+
+
+void adm31_state::mem_map(address_map &map)
+{
+	map(0x0000, 0x03ff).ram();
+	map(0x7000, 0x7000).nopw();
+	map(0x7800, 0x7803).rw("pia", FUNC(pia6821_device::read), FUNC(pia6821_device::write));
+	map(0x7900, 0x7900).portr("7900");
+	map(0x7a00, 0x7a01).rw(m_acia[0], FUNC(acia6850_device::read), FUNC(acia6850_device::write));
+	map(0x7c00, 0x7c01).rw(m_acia[1], FUNC(acia6850_device::read), FUNC(acia6850_device::write));
+	map(0x7d00, 0x7d00).portr("7D00");
+	map(0x7e00, 0x7e00).portr("7E00");
+	map(0x7f00, 0x7f0f).rw(m_vtac, FUNC(crt5027_device::read), FUNC(crt5027_device::write));
+	map(0x8000, 0x8fff).ram();
+	map(0xe000, 0xffff).rom().region("program", 0);
+}
+
+
+static INPUT_PORTS_START(adm31)
+	PORT_START("7900")
+	PORT_BIT(0xff, IP_ACTIVE_LOW, IPT_UNKNOWN)
+
+	PORT_START("7D00")
+	PORT_BIT(0xff, IP_ACTIVE_LOW, IPT_UNKNOWN)
+
+	PORT_START("7E00")
+	PORT_DIPNAME(0x02, 0x02, "Refresh Rate")
+	PORT_DIPSETTING(0x00, "50 Hz")
+	PORT_DIPSETTING(0x02, "60 Hz")
+	PORT_BIT(0xfd, IP_ACTIVE_LOW, IPT_UNKNOWN)
+INPUT_PORTS_END
+
+void adm31_state::adm31(machine_config &config)
+{
+	M6800(config, m_maincpu, 19.584_MHz_XTAL / 20);
+	m_maincpu->set_addrmap(AS_PROGRAM, &adm31_state::mem_map);
+
+	INPUT_MERGER_ANY_HIGH(config, "mainirq").output_handler().set_inputline(m_maincpu, M6800_IRQ_LINE);
+
+	PIA6821(config, "pia");
+
+	ACIA6850(config, m_acia[0]);
+	m_acia[0]->irq_handler().set("mainirq", FUNC(input_merger_device::in_w<0>));
+
+	ACIA6850(config, m_acia[1]);
+	m_acia[0]->irq_handler().set("mainirq", FUNC(input_merger_device::in_w<1>));
+
+	com8116_device &brg(COM8116(config, "brg", 5.0688_MHz_XTAL));
+	brg.fr_handler().set(m_acia[0], FUNC(acia6850_device::write_rxc));
+	brg.fr_handler().append(m_acia[0], FUNC(acia6850_device::write_txc));
+	brg.ft_handler().set(m_acia[1], FUNC(acia6850_device::write_rxc));
+	brg.ft_handler().append(m_acia[1], FUNC(acia6850_device::write_txc));
+
+	screen_device &screen(SCREEN(config, "screen", SCREEN_TYPE_RASTER));
+	screen.set_raw(19.584_MHz_XTAL, 1020, 0, 800, 320, 0, 300);
+	screen.set_screen_update(FUNC(adm31_state::screen_update));
+
+	CRT5027(config, m_vtac, 19.584_MHz_XTAL / 10);
+	m_vtac->set_screen("screen");
+	m_vtac->set_char_width(10);
+}
+
+
+ROM_START(adm31)
+	ROM_REGION(0x2000, "program", 0)
+	ROM_LOAD("adm-31-u62.bin", 0x0000, 0x0800, CRC(57e557a5) SHA1(cb3021ab570c279cbaa673b5de8fa1ca9eb48188))
+	ROM_LOAD("adm-31-u63.bin", 0x0800, 0x0800, CRC(1268a59c) SHA1(f0cd8562e0d5faebf84d8decaa848ff28f2ac637))
+	ROM_LOAD("adm-31-u64.bin", 0x1000, 0x0800, CRC(8939fa00) SHA1(00f6a8a49e51a9501cd9d1e2aae366fb070a5a1d))
+	ROM_LOAD("adm-31-u65.bin", 0x1800, 0x0800, CRC(53e4e2f1) SHA1(bf30241815c790de3354e1acfe84e760c889cbb1))
+
+	ROM_REGION(0x0800, "chargen", 0)
+	ROM_LOAD("chargen.bin", 0x0000, 0x0800, NO_DUMP)
+ROM_END
+
+
+COMP(1978, adm31, 0, 0, adm31, adm31, adm31_state, empty_init, "Lear Siegler", "ADM-31 Data Display Terminal", MACHINE_IS_SKELETON)

src/mame/mame.lst

@@ -907,6 +907,9 @@ adam                            // Coleco Adam
 @source:adm23.cpp
 adm23                           //
 
+@source:adm31.cpp
+adm31                           //
+
 @source:adp.cpp
 fashiong                        // (c) 1997
 fashiong2                       // (c) 1997

src/mame/mess.flt

@@ -21,6 +21,7 @@ acrnsys.cpp
 acvirus.cpp
 adam.cpp
 adm23.cpp
+adm31.cpp
 advision.cpp
 agat.cpp
 aim65.cpp