diff --git a/src/mame/drivers/hh_hmcs40.cpp b/src/mame/drivers/hh_hmcs40.cpp
index 45e3f433897..beadd3ededd 100644
--- a/src/mame/drivers/hh_hmcs40.cpp
+++ b/src/mame/drivers/hh_hmcs40.cpp
@@ -19,9 +19,9 @@
  @04      HD38800A  1980, Gakken Heiankyo Alien
  @25      HD38800A  1981, Coleco Alien Attack
  @27      HD38800A  1981, Bandai Packri Monster
- *31      HD38800A  1981, Entex Select-a-Game cartridge: Space Invader 2 (have dump)
- *37      HD38800A  1981, Entex Select-a-Game cartridge: Baseball 4 (have dump)
- *38      HD38800A  1981, Entex Select-a-Game cartridge: Pinball (have dump)
+ @31      HD38800A  1981, Entex Select-a-Game cartridge: Space Invader 2
+ @37      HD38800A  1981, Entex Select-a-Game cartridge: Baseball 4
+ @38      HD38800A  1981, Entex Select-a-Game cartridge: Pinball
  *41      HD38800A  1982, Gakken Puck Monster
  *51      HD38800A  1981, Actronics(Hanzawa) Twinvader (larger white version)
  @70      HD38800A  1982, Coleco Galaxian
@@ -147,6 +147,7 @@ public:
 	TIMER_DEVICE_CALLBACK_MEMBER(display_decay_tick);
 	void display_update();
 	void set_display_size(int maxx, int maxy);
+	void set_display_segmask(UINT32 digits, UINT32 mask);
 	void display_matrix(int maxx, int maxy, UINT64 setx, UINT32 sety, bool update = true);
 
 protected:
@@ -276,6 +277,17 @@ void hh_hmcs40_state::set_display_size(int maxx, int maxy)
 	m_display_maxy = maxy;
 }
 
+void hh_hmcs40_state::set_display_segmask(UINT32 digits, UINT32 mask)
+{
+	// set a segment mask per selected digit, but leave unselected ones alone
+	for (int i = 0; i < 0x20; i++)
+	{
+		if (digits & 1)
+			m_display_segmask[i] = mask;
+		digits >>= 1;
+	}
+}
+
 void hh_hmcs40_state::display_matrix(int maxx, int maxy, UINT64 setx, UINT32 sety, bool update)
 {
 	set_display_size(maxx, maxy);
@@ -2503,6 +2515,136 @@ MACHINE_CONFIG_END
 
 
 
+/***************************************************************************
+
+  Entex Select-A-Game (HMCS40 MCU cartridges)
+  * see gamelist for cartridge info
+  * cyan/red VFD display Futaba DM-16Z + cyan VFD 9-digit panel Futaba 9-ST-11A 1F
+  
+  The console is the peripheral, the heart of the system is the cartridge.
+  Cartridges with a HMCS40 MCU are implemented in this driver.
+  
+  MAME external artwork is recommended, needed for per-game VFD overlays.
+
+***************************************************************************/
+
+class sag_state : public hh_hmcs40_state
+{
+public:
+	sag_state(const machine_config &mconfig, device_type type, const char *tag)
+		: hh_hmcs40_state(mconfig, type, tag)
+	{ }
+
+	void prepare_display();
+	DECLARE_WRITE8_MEMBER(plate_w);
+	DECLARE_WRITE16_MEMBER(grid_w);
+	DECLARE_READ16_MEMBER(input_r);
+};
+
+// handlers
+
+void sag_state::prepare_display()
+{
+	// grid 0-7 are the 'pixels'
+	for (int y = 0; y < 8; y++)
+		m_display_state[y] = (m_grid >> y & 1) ? m_plate : 0;
+	
+	// grid 8-11 are 7segs
+	set_display_segmask(0xf00, 0x7f);
+	UINT8 seg = BITSWAP8(m_plate,3,4,5,6,7,8,9,10);
+	for (int y = 8; y < 12; y++)
+		m_display_state[y] = (m_grid >> y & 1) ? seg : 0;
+
+	set_display_size(14, 12);
+	display_update();
+}
+
+WRITE8_MEMBER(sag_state::plate_w)
+{
+	// R0x-R3x: vfd matrix plate
+	int shift = offset * 4;
+	m_plate = (m_plate & ~(0xf << shift)) | (data << shift);
+	prepare_display();
+}
+
+WRITE16_MEMBER(sag_state::grid_w)
+{
+	// D0: speaker out
+	m_speaker->level_w(data & 1);
+
+	// D2-D7: input mux
+	m_inp_mux = data >> 2 & 0x3f;
+
+	// D1-D12: vfd matrix grid
+	m_grid = data >> 1 & 0xfff;
+	prepare_display();
+}
+
+READ16_MEMBER(sag_state::input_r)
+{
+	// D13-D15: multiplexed inputs
+	return read_inputs(6) << 13;
+}
+
+
+// config
+
+static INPUT_PORTS_START( sag )
+	PORT_START("IN.0") // D2
+	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_JOYSTICK_UP ) PORT_16WAY PORT_NAME("P1 Button 1")
+	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_JOYSTICK_DOWN ) PORT_COCKTAIL PORT_16WAY PORT_NAME("P2 Button 3")
+	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_UNUSED )
+
+	PORT_START("IN.1") // D3
+	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_JOYSTICK_RIGHT ) PORT_16WAY PORT_NAME("P1 Button 2")
+	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_JOYSTICK_LEFT ) PORT_COCKTAIL PORT_16WAY PORT_NAME("P2 Button 4")
+	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_UNUSED )
+
+	PORT_START("IN.2") // D4
+	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_JOYSTICK_DOWN ) PORT_16WAY PORT_NAME("P1 Button 3")
+	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_JOYSTICK_UP ) PORT_COCKTAIL PORT_16WAY PORT_NAME("P2 Button 1")
+	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_UNUSED )
+
+	PORT_START("IN.3") // D5
+	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_JOYSTICK_LEFT ) PORT_16WAY PORT_NAME("P1 Button 4")
+	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_JOYSTICK_RIGHT ) PORT_COCKTAIL PORT_16WAY PORT_NAME("P2 Button 2")
+	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_UNUSED )
+
+	PORT_START("IN.4") // D6
+	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_BUTTON3 ) PORT_NAME("P1 Button 5")
+	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_BUTTON3 ) PORT_COCKTAIL PORT_NAME("P2 Button 5")
+	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_BUTTON1 ) PORT_NAME("P1 Button 7")
+
+	PORT_START("IN.5") // D7
+	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_BUTTON2 ) PORT_NAME("P1 Button 6")
+	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_BUTTON2 ) PORT_COCKTAIL PORT_NAME("P2 Button 6")
+	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_BUTTON1 ) PORT_COCKTAIL PORT_NAME("P2 Button 7")
+INPUT_PORTS_END
+
+static MACHINE_CONFIG_START( sag, sag_state )
+
+	/* basic machine hardware */
+	MCFG_CPU_ADD("maincpu", HD38800, 450000) // approximation
+	MCFG_HMCS40_WRITE_R_CB(0, WRITE8(sag_state, plate_w))
+	MCFG_HMCS40_WRITE_R_CB(1, WRITE8(sag_state, plate_w))
+	MCFG_HMCS40_WRITE_R_CB(2, WRITE8(sag_state, plate_w))
+	MCFG_HMCS40_WRITE_R_CB(3, WRITE8(sag_state, plate_w))
+	MCFG_HMCS40_WRITE_D_CB(WRITE16(sag_state, grid_w))
+	MCFG_HMCS40_READ_D_CB(READ16(sag_state, input_r))
+
+	MCFG_TIMER_DRIVER_ADD_PERIODIC("display_decay", hh_hmcs40_state, display_decay_tick, attotime::from_msec(1))
+	MCFG_DEFAULT_LAYOUT(layout_hh_hmcs40_test)
+
+	/* sound hardware */
+	MCFG_SPEAKER_STANDARD_MONO("mono")
+	MCFG_SOUND_ADD("speaker", SPEAKER_SOUND, 0)
+	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.25)
+MACHINE_CONFIG_END
+
+
+
+
+
 /***************************************************************************
 
   Entex Galaxian 2 (manufactured in Japan)
@@ -4145,6 +4287,27 @@ ROM_START( cmspacmn )
 ROM_END
 
 
+ROM_START( sag_si2 )
+	ROM_REGION( 0x2000, "maincpu", ROMREGION_ERASE00 )
+	ROM_LOAD( "inv2_hd38800a31", 0x0000, 0x1000, BAD_DUMP CRC(29c8c100) SHA1(41cd413065659c6d7d5b2408de2ca6d51c49629a) )
+	ROM_CONTINUE(                0x1e80, 0x0100 )
+ROM_END
+
+
+ROM_START( sag_bb4 )
+	ROM_REGION( 0x2000, "maincpu", ROMREGION_ERASE00 )
+	ROM_LOAD( "b-b5_hd38800a37", 0x0000, 0x1000, CRC(64852bd5) SHA1(fb1c24ca43934ceb6fc35ac7c35b71e6e843dbc5) )
+	ROM_CONTINUE(                0x1e80, 0x0100 )
+ROM_END
+
+
+ROM_START( sag_pb )
+	ROM_REGION( 0x2000, "maincpu", ROMREGION_ERASE00 )
+	ROM_LOAD( "pinb_hd38800a38", 0x0000, 0x1000, CRC(6e53a56b) SHA1(13f057eab2e4cfbb3ef1247a041abff15ae727c9) )
+	ROM_CONTINUE(                0x1e80, 0x0100 )
+ROM_END
+
+
 ROM_START( egalaxn2 )
 	ROM_REGION( 0x2000, "maincpu", ROMREGION_ERASE00 )
 	ROM_LOAD( "hd38820a13", 0x0000, 0x1000, CRC(112b721b) SHA1(4a185bc57ea03fe64f61f7db4da37b16eeb0cb54) )
@@ -4304,6 +4467,9 @@ CONS( 1981, cpacman,   0,        0, cpacman,  cpacman,  driver_device, 0, "Colec
 CONS( 1981, cpacmanr1, cpacman,  0, cpacman,  cpacman,  driver_device, 0, "Coleco", "Pac-Man (Coleco, Rev. 28)", MACHINE_SUPPORTS_SAVE )
 CONS( 1983, cmspacmn,  0,        0, cmspacmn, cmspacmn, driver_device, 0, "Coleco", "Ms. Pac-Man (Coleco)", MACHINE_SUPPORTS_SAVE )
 
+CONS( 1981, sag_si2,   0,        0, sag,      sag,      driver_device, 0, "Entex", "Select-A-Game: Space Invader 2", MACHINE_SUPPORTS_SAVE | MACHINE_REQUIRES_ARTWORK | MACHINE_NOT_WORKING ) // suspect bad dump
+CONS( 1981, sag_bb4,   0,        0, sag,      sag,      driver_device, 0, "Entex", "Select-A-Game: Baseball 4", MACHINE_SUPPORTS_SAVE | MACHINE_REQUIRES_ARTWORK )
+CONS( 1981, sag_pb,    0,        0, sag,      sag,      driver_device, 0, "Entex", "Select-A-Game: Pinball", MACHINE_SUPPORTS_SAVE | MACHINE_REQUIRES_ARTWORK )
 CONS( 1981, egalaxn2,  0,        0, egalaxn2, egalaxn2, driver_device, 0, "Entex", "Galaxian 2 (Entex)", MACHINE_SUPPORTS_SAVE )
 CONS( 1981, epacman2,  0,        0, epacman2, epacman2, driver_device, 0, "Entex", "Pac Man 2 (Entex, cyan Pacman)", MACHINE_SUPPORTS_SAVE )
 CONS( 1981, epacman2r, epacman2, 0, epacman2, epacman2, driver_device, 0, "Entex", "Pac Man 2 (Entex, red Pacman)", MACHINE_SUPPORTS_SAVE )
diff --git a/src/mame/mame.lst b/src/mame/mame.lst
index 32e3aa6f14e..39d7101fcb8 100644
--- a/src/mame/mame.lst
+++ b/src/mame/mame.lst
@@ -14042,6 +14042,9 @@ mwcbaseb                        // Mattel
 packmon                         // Bandai
 pairmtch                        // Bandai
 pbqbert                         // Parker Brothers
+sag_si2                         // Entex
+sag_bb4                         // Entex
+sag_pb                          // Entex
 tmtron                          // Tomy
 vinvader                        // VTech
 zackman                         // Bandai