New systems marked not working

------------------------------
OB-SX [Siftware]

New working clones
------------------
Checkmate (set 2) [Siftware]

Author: Osso13

src/mame/mame.lst

@@ -29307,6 +29307,7 @@ blueshrkmr2
 boothill
 bowler
 checkmat
+checkmata
 clowns
 clowns1
 desertgu
@@ -36415,6 +36416,9 @@ obdmx
 @source:oberheim/ob8.cpp
 ob8
 
+@source:oberheim/obsx.cpp
+obsx
+
 @source:oberheim/xpander.cpp
 xpander
 

src/mame/midw8080/mw8080bw.cpp

@@ -2991,6 +2991,19 @@ ROM_START( checkmat )
 ROM_END
 
 
+ROM_START( checkmata ) // 80-900E PCB, no labels, only a red number stamped on the ROM
+	ROM_REGION( 0x10000, "maincpu", 0 )
+	ROM_LOAD( "1.h", 0x0000, 0x0200, CRC(15c90cde) SHA1(4721d7bd6331af71bbf51187d770f3f82324c030) )
+	ROM_LOAD( "2.g", 0x0200, 0x0200, CRC(af52a8d0) SHA1(a12c761544fb765afd5e0fd5ae25fdb7e272ace0) )
+	ROM_LOAD( "3.f", 0x0400, 0x0200, CRC(a4650524) SHA1(ef10ba1c57c98a7f323791a892c352936e181426) )
+	ROM_LOAD( "4.e", 0x0600, 0x0200, CRC(d02488c9) SHA1(8080e1c370f431c206a0a62e48157ac0c45cfaf0) )
+	ROM_LOAD( "5.d", 0x0800, 0x0200, CRC(a0477f03) SHA1(67f45468d58d3a1c9f5d24013416cc15231ec0db) )
+	ROM_LOAD( "6.c", 0x0a00, 0x0200, CRC(1ae4e225) SHA1(43476faccc361aacc68b8eca956d7e9b62607901) )
+	ROM_LOAD( "7.b", 0x0c00, 0x0200, CRC(1eb04641) SHA1(f956784cd80a817fe51f0c6c017eabcba203d352) )
+	ROM_LOAD( "8.a", 0x0e00, 0x0200, CRC(b5ce1a2a) SHA1(fe35bddf0ef558743ffc63ac46a1298d82a74df4) )
+ROM_END
+
+
 ROM_START( desertgu )
 	ROM_REGION( 0x10000, "maincpu", 0 )
 	ROM_LOAD( "9316.1h",    0x0000, 0x0800, CRC(c0030d7c) SHA1(4d0a3a59d4f8181c6e30966a6b1d19ba5b29c398) )
@@ -3255,7 +3268,8 @@ ROM_END
 /* 610 */ GAMEL( 1976, 280zzzapa,   280zzzap, zzzap,    zzzap,    zzzap_state,    empty_init, ROT0,   "Dave Nutting Associates / Midway",         "280-ZZZAP (set 2)",                              MACHINE_SUPPORTS_SAVE,                           layout_280zzzap )
 /* 611 */ GAMEL( 1976, maze,        0,        maze,     maze,     mw8080bw_state, empty_init, ROT0,   "Midway",                                   "Amazing Maze",                                   MACHINE_SUPPORTS_SAVE,                           layout_maze )
 /* 612 */ GAME(  1977, boothill,    0,        boothill, boothill, boothill_state, empty_init, ROT0,   "Dave Nutting Associates / Midway",         "Boot Hill",                                      MACHINE_SUPPORTS_SAVE )
-/* 615 */ GAME(  1977, checkmat,    0,        checkmat, checkmat, mw8080bw_state, empty_init, ROT0,   "Dave Nutting Associates / Midway",         "Checkmate",                                      MACHINE_IMPERFECT_SOUND | MACHINE_SUPPORTS_SAVE )
+/* 615 */ GAME(  1977, checkmat,    0,        checkmat, checkmat, mw8080bw_state, empty_init, ROT0,   "Dave Nutting Associates / Midway",         "Checkmate (set 1)",                              MACHINE_IMPERFECT_SOUND | MACHINE_SUPPORTS_SAVE )
+/* 615 */ GAME(  1977, checkmata,   checkmat, checkmat, checkmat, mw8080bw_state, empty_init, ROT0,   "Dave Nutting Associates / Midway",         "Checkmate (set 2)",                              MACHINE_IMPERFECT_SOUND | MACHINE_SUPPORTS_SAVE )
 /* 618 */ GAME(  1977, desertgu,    0,        desertgu, desertgu, desertgu_state, empty_init, ROT0,   "Dave Nutting Associates / Midway",         "Desert Gun",                                     MACHINE_IMPERFECT_SOUND | MACHINE_SUPPORTS_SAVE )
 /* 618 */ GAME(  1977, roadrunm,    desertgu, desertgu, desertgu, desertgu_state, empty_init, ROT0,   "Midway",                                   "Road Runner (Midway)",                           MACHINE_IMPERFECT_SOUND | MACHINE_SUPPORTS_SAVE )
 /* 619 */ GAME(  1977, dplay,       0,        dplay,    dplay,    dplay_state,    empty_init, ROT0,   "Midway",                                   "Double Play",                                    MACHINE_SUPPORTS_SAVE )

src/mame/oberheim/ob8.cpp

@@ -5,7 +5,7 @@ The OB-8 is an 8-voice digitally-controlled analog synthesizer.
 
 The firmware runs on a Z80.
 
-The driver is based on the OB8 srevice manual and schematics, and is intended
+The driver is based on the OB8 service manual and schematics, and is intended
 as an educational tool.
 
 This driver is very much an early-stage skeleton.

src/mame/oberheim/obsx.cpp

@@ -0,0 +1,74 @@
+// license:BSD-3-Clause
+// copyright-holders:
+
+/*
+Oberheim OB-SX synthesizer
+Six voice with 56 programs
+
+Oberheim 1458 B PCB
+
+Z8400 PS CPU
+lots of logic chips
+*/
+
+#include "emu.h"
+
+#include "cpu/z80/z80.h"
+
+
+namespace {
+
+class obsx_state : public driver_device
+{
+public:
+	obsx_state(const machine_config &mconfig, device_type type, const char *tag) ATTR_COLD
+		: driver_device(mconfig, type, tag)
+		, m_maincpu(*this, "maincpu")
+	{
+	}
+
+	void obsx(machine_config &config) ATTR_COLD;
+
+private:
+	required_device<z80_device> m_maincpu;
+
+	void program_map(address_map &map) ATTR_COLD;
+	void io_map(address_map &map) ATTR_COLD;
+};
+
+
+void obsx_state::program_map(address_map &map)
+{
+	map(0x0000, 0x0bff).rom();
+	map(0x4000, 0x40ff).ram();
+}
+
+void obsx_state::io_map(address_map &map)
+{
+	map.unmap_value_high();
+}
+
+
+INPUT_PORTS_START(obsx)
+INPUT_PORTS_END
+
+
+void obsx_state::obsx(machine_config &config)
+{
+	Z80(config, m_maincpu, 4'000'000); // clock not verified
+	m_maincpu->set_addrmap(AS_PROGRAM, &obsx_state::program_map);
+	m_maincpu->set_addrmap(AS_IO, &obsx_state::io_map);
+}
+
+
+ROM_START( obsx )
+	ROM_REGION( 0xc00, "maincpu", 0 )
+	ROM_LOAD( "sx-c0.30", 0x000, 0x400, CRC(8d35d2d2) SHA1(94baafb1b17c00c396a98ce69e18078294fe1710) )
+	ROM_LOAD( "sxc1.31",  0x400, 0x400, CRC(f6325457) SHA1(ae6749aa6c79c3bd16310616387b7d262f767b59) )
+	ROM_LOAD( "sxc2.32",  0x800, 0x400, CRC(1471d3b6) SHA1(1c5ec479986e98a3ca6ea38d9c14d2d418a38f02) )
+ROM_END
+
+} // anonymous namespace
+
+
+SYST( 1980, obsx, 0, 0, obsx, obsx, obsx_state, empty_init, "Oberheim", "OB-SX", MACHINE_NOT_WORKING | MACHINE_NO_SOUND )