New machines marked as NOT_WORKING

----------------------------------
Systel System 100 [Al Kossow, Bitsavers]

scripts/target/mame/mess.lua

@@ -4002,6 +4002,7 @@ files {
 	MAME_DIR .. "src/mame/drivers/sys2900.cpp",
 	MAME_DIR .. "src/mame/drivers/sys9002.cpp",
 	MAME_DIR .. "src/mame/drivers/systec.cpp",
+	MAME_DIR .. "src/mame/drivers/systel1.cpp",
 	MAME_DIR .. "src/mame/drivers/talkingbb.cpp",
 	MAME_DIR .. "src/mame/drivers/talkingfb.cpp",
 	MAME_DIR .. "src/mame/drivers/tavernie.cpp",

src/emu/xtal.cpp

@@ -160,6 +160,7 @@ const double XTAL::known_xtals[] = {
 	 10'733'000, /* 10.733_MHz_XTAL        The Fairyland Story */
 	 10'738'635, /* 10.738635_MHz_XTAL     TMS9918 family (3x NTSC subcarrier) */
 	 10'816'000, /* 10.816_MHz_XTAL        Universal 1979-1980 (Cosmic Alien, etc) */
+	 10'886'400, /* 10.8864_MHz_XTAL       Systel System 100 */
 	 10'920'000, /* 10.92_MHz_XTAL         ADDS Viewpoint 60, Viewpoint A2 */
 	 11'000'000, /* 11_MHz_XTAL            Mario I8039 sound */
 	 11'004'000, /* 11.004_MHz_XTAL        TI 911 VDT */

src/mame/drivers/systel1.cpp

@@ -0,0 +1,134 @@
+// license:BSD-3-Clause
+// copyright-holders:AJR
+/***************************************************************************
+
+    Skeleton driver for Systel System 1/System 100 computer.
+
+    This minimalistic luggable computer has a green-screen monitor and
+    5¼-inch floppy drive (Shugart SA455) built into the unit. The detached
+    keyboard may be replaced with a standard electric typewriter. There is
+    a TYPE/WP switch on the front of the unit.
+
+***************************************************************************/
+
+#include "emu.h"
+#include "cpu/z80/z80.h"
+#include "machine/clock.h"
+#include "machine/i8251.h"
+#include "machine/i8257.h"
+#include "machine/wd_fdc.h"
+#include "video/i8275.h"
+#include "screen.h"
+
+class systel1_state : public driver_device
+{
+public:
+	systel1_state(const machine_config &mconfig, device_type type, const char *tag)
+		: driver_device(mconfig, type, tag)
+		, m_maincpu(*this, "maincpu")
+		, m_dmac(*this, "dmac")
+		, m_chargen(*this, "chargen")
+	{
+	}
+
+	void systel1(machine_config &config);
+
+private:
+	DECLARE_WRITE_LINE_MEMBER(hrq_w);
+	u8 memory_r(offs_t offset);
+	void memory_w(offs_t offset, u8 data);
+
+	I8275_DRAW_CHARACTER_MEMBER(draw_character);
+
+	void mem_map(address_map &map);
+	void io_map(address_map &map);
+
+	required_device<cpu_device> m_maincpu;
+	required_device<i8257_device> m_dmac;
+	required_region_ptr<u8> m_chargen;
+};
+
+WRITE_LINE_MEMBER(systel1_state::hrq_w)
+{
+	m_maincpu->set_input_line(INPUT_LINE_HALT, state);
+	m_dmac->hlda_w(state);
+}
+
+u8 systel1_state::memory_r(offs_t offset)
+{
+	return m_maincpu->space(AS_PROGRAM).read_byte(offset);
+}
+
+void systel1_state::memory_w(offs_t offset, u8 data)
+{
+	m_maincpu->space(AS_PROGRAM).write_byte(offset, data);
+}
+
+I8275_DRAW_CHARACTER_MEMBER(systel1_state::draw_character)
+{
+}
+
+void systel1_state::mem_map(address_map &map)
+{
+	map(0x0000, 0x07ff).rom().region("program", 0);
+	map(0x4000, 0xffff).ram();
+}
+
+void systel1_state::io_map(address_map &map)
+{
+	map.global_mask(0xff);
+	map(0x00, 0x00).portr("JUMPERS");
+	map(0x10, 0x11).rw("usart", FUNC(i8251_device::read), FUNC(i8251_device::write));
+	map(0x20, 0x29).rw(m_dmac, FUNC(i8257_device::read), FUNC(i8257_device::write));
+	map(0x40, 0x41).rw("crtc", FUNC(i8276_device::read), FUNC(i8276_device::write));
+}
+
+static INPUT_PORTS_START(systel1)
+	PORT_START("JUMPERS") // probably at J6
+	PORT_DIPNAME(0x02, 0x00, "Screen Refresh")
+	PORT_DIPSETTING(0x02, "50 Hz")
+	PORT_DIPSETTING(0x00, "60 Hz")
+INPUT_PORTS_END
+
+void systel1_state::systel1(machine_config &config)
+{
+	Z80(config, m_maincpu, 2_MHz_XTAL); // Z8400A; clock not verified
+	m_maincpu->set_addrmap(AS_PROGRAM, &systel1_state::mem_map);
+	m_maincpu->set_addrmap(AS_IO, &systel1_state::io_map);
+
+	I8257(config, m_dmac, 2_MHz_XTAL); // P8257-5
+	m_dmac->out_hrq_cb().set(FUNC(systel1_state::hrq_w));
+	m_dmac->in_memr_cb().set(FUNC(systel1_state::memory_r));
+	m_dmac->out_memw_cb().set(FUNC(systel1_state::memory_w));
+	m_dmac->out_iow_cb<2>().set("crtc", FUNC(i8276_device::dack_w));
+
+	I8251(config, "usart", 2_MHz_XTAL); // AMD P8251A
+
+	clock_device &baudclock(CLOCK(config, "baudclock", 2_MHz_XTAL / 13)); // rate not verified, but also probably fixed
+	baudclock.signal_handler().set("usart", FUNC(i8251_device::write_rxc));
+	baudclock.signal_handler().append("usart", FUNC(i8251_device::write_txc));
+
+	screen_device &screen(SCREEN(config, "screen", SCREEN_TYPE_RASTER));
+	screen.set_color(rgb_t::green());
+	screen.set_raw(10.8864_MHz_XTAL, 672, 0, 560, 270, 0, 250);
+	screen.set_screen_update("crtc", FUNC(i8276_device::screen_update));
+
+	i8276_device &crtc(I8276(config, "crtc", 10.8864_MHz_XTAL / 7)); // WD8276PL-00
+	crtc.set_character_width(7);
+	crtc.set_display_callback(FUNC(systel1_state::draw_character));
+	crtc.drq_wr_callback().set(m_dmac, FUNC(i8257_device::dreq2_w));
+
+	FD1797(config, "fdc", 2_MHz_XTAL);
+}
+
+// XTALs: 10.8864 (Y1), 2.000 (Y2)
+// Silkscreened on PCB: "SYSTEL / SYSTEM 1 / 1031-3101-00 REV H"
+ROM_START(systel100)
+	ROM_REGION(0x800, "program", 0) // TMS2716JL-45
+	ROM_LOAD("u11.bin", 0x000, 0x800, CRC(29f1414a) SHA1(c87adfaaec45d0e5f4cf5946d2f04de0332b3413))
+
+	ROM_REGION(0x800, "chargen", 0) // TMS2516JL-45
+	ROM_LOAD("u16.bin", 0x000, 0x800, CRC(61a8d742) SHA1(69dada638a17353f91bff34a1e2319a35d8a3ebf))
+ROM_END
+
+COMP(198?, systel100, 0, 0, systel1, systel1, systel1_state, empty_init, "Systel Computer", "System 100", MACHINE_IS_SKELETON)

src/mame/mame.lst

@@ -36847,6 +36847,9 @@ sys9002                         //
 @source:systec.cpp
 systec                          //
 
+@source:systel1.cpp
+systel100                       //
+
 @source:system1.cpp
 4dwarrio                        // 834-5918 (c) 1985 Coreland / Sega (S1)
 blockgal                        // 834-6303 (S1)

src/mame/mess.flt

@@ -762,6 +762,7 @@ symbolics.cpp
 sys2900.cpp
 sys9002.cpp
 systec.cpp
+systel1.cpp
 talkingbb.cpp
 talkingfb.cpp
 tamag1.cpp