diff --git a/src/mame/drivers/g627.c b/src/mame/drivers/g627.c
index df241cc22f8..2f23085a7bd 100644
--- a/src/mame/drivers/g627.c
+++ b/src/mame/drivers/g627.c
@@ -7,20 +7,44 @@
 
     Only one of its kind
 
+    This is a cocktail pinball game, for up to 4 players. The board is round.
+    When it is another player's turn, the playboard will turn around to face
+    him. And so, the system has a motor and an infrared shaft-locating system.
+    If this system does not return the expected data, the machine will refuse
+    to start.
+
+    Schematic and PinMAME used as references
+
+ToDo:
+- Battery backup
+- Inputs
+- Outputs
+- Displays / Layout
+- Diagnostic keyboard
+- Possibility of a rom missing (most likely it is optional)
+
 *******************************************************************************/
 
 
 #include "emu.h"
 #include "cpu/z80/z80.h"
+#include "machine/i8155.h"
+#include "sound/astrocde.h"
+
 
 class g627_state : public driver_device
 {
 public:
 	g627_state(const machine_config &mconfig, device_type type, const char *tag)
 		: driver_device(mconfig, type, tag),
-		  m_maincpu(*this, "maincpu")
+	m_maincpu(*this, "maincpu")
 	{ }
 
+	DECLARE_READ8_MEMBER(porta_r);
+	DECLARE_READ8_MEMBER(portb_r);
+	DECLARE_WRITE8_MEMBER(portc_w);
+	DECLARE_WRITE8_MEMBER(disp_w);
+
 protected:
 
 	// devices
@@ -28,23 +52,23 @@ protected:
 
 	// driver_device overrides
 	virtual void machine_reset();
-public:
-	DECLARE_DRIVER_INIT(g627);
+private:
+	UINT8 m_seg[6];
 };
 
 
 static ADDRESS_MAP_START( g627_map, AS_PROGRAM, 8, g627_state )
-	AM_RANGE(0x0000, 0x17ff) AM_ROM
-	AM_RANGE(0xc000, 0xc0ff) AM_RAM
+	AM_RANGE(0x0000, 0x1fff) AM_ROM
+	AM_RANGE(0xc000, 0xc0ff) AM_DEVREADWRITE("i8156", i8155_device, memory_r, memory_w)
+	AM_RANGE(0xe000, 0xe0ff) AM_RAM // battery backed
 ADDRESS_MAP_END
 
 static ADDRESS_MAP_START( g627_io, AS_IO, 8, g627_state )
 	ADDRESS_MAP_GLOBAL_MASK(0xff)
-	//AM_RANGE(0x00, 0x02) AM_WRITE(disp_w)
+	AM_RANGE(0x00, 0x02) AM_WRITE(disp_w)
 	//AM_RANGE(0x03, 0x07) AM_WRITE(port_0x_w)
-	//AM_RANGE(0x10, 0x17) AM_WRITE(port_1x_w)
-	//AM_RANGE(0x21, 0x22) AM_READ(port_2x_r)
-	//AM_RANGE(0x20, 0x25) AM_WRITE(port_2x_w)
+	AM_RANGE(0x10, 0x17) AM_DEVWRITE_LEGACY("astrocade", astrocade_sound_w)
+	AM_RANGE(0x20, 0x27) AM_DEVREADWRITE("i8156", i8155_device, io_r, io_w)
 ADDRESS_MAP_END
 
 static INPUT_PORTS_START( g627 )
@@ -54,26 +78,64 @@ void g627_state::machine_reset()
 {
 }
 
-DRIVER_INIT_MEMBER(g627_state,g627)
+READ8_MEMBER( g627_state::porta_r )
 {
+	return 0;
 }
 
+READ8_MEMBER( g627_state::portb_r )
+{
+	return 0;
+}
+
+// write the 6 digits of 1 display panel
+WRITE8_MEMBER( g627_state::portc_w )
+{
+	if (data < 7)
+		for (int i = 0; i < 6; i++)
+			output_set_digit_value(data * 10 + i, m_seg[i]);
+}
+
+// save segments until we can write the digits
+WRITE8_MEMBER( g627_state::disp_w )
+{
+	static const UINT8 patterns[16] = { 0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07, 0x7f, 0x6f, 0, 0, 0, 0, 0, 0 };
+	offset <<= 1;
+	m_seg[offset]=patterns[data>>4];
+	m_seg[++offset]=patterns[data&15];
+}
+
+static I8156_INTERFACE(i8156_intf)
+{
+	DEVCB_DRIVER_MEMBER(g627_state,porta_r), // Port A in
+	DEVCB_NULL, // Port A out
+	DEVCB_DRIVER_MEMBER(g627_state,portb_r), // Port B in
+	DEVCB_NULL, // Port B out
+	DEVCB_NULL, // Port C in
+	DEVCB_DRIVER_MEMBER(g627_state,portc_w), // Port C out
+	DEVCB_CPU_INPUT_LINE("maincpu", INPUT_LINE_NMI) // timer out
+};
+
 static MACHINE_CONFIG_START( g627, g627_state )
 	/* basic machine hardware */
 	MCFG_CPU_ADD("maincpu", Z80, 14138000/8)
 	MCFG_CPU_PROGRAM_MAP(g627_map)
 	MCFG_CPU_IO_MAP(g627_io)
+	MCFG_I8156_ADD("i8156", 14138000/8, i8156_intf)
+	MCFG_SPEAKER_STANDARD_MONO("mono")
+	MCFG_SOUND_ADD("astrocade",  ASTROCADE, 14138000/8) // 0066-117XX audio chip
+	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.0)
 MACHINE_CONFIG_END
 
 /*-------------------------------------------------------------------
 / Rotation VIII (09/1978)
 /-------------------------------------------------------------------*/
 ROM_START(rotation)
-	ROM_REGION(0x10000, "maincpu", 0)
+	ROM_REGION(0x10000, "maincpu", 0) // schematic shows 4x 2716 roms
 	ROM_LOAD("rot-a117.dat", 0x0000, 0x0800, CRC(7bb6beb3) SHA1(5ee62246032158c68d426c11a4a9a889ee7655d7))
 	ROM_LOAD("rot-b117.dat", 0x0800, 0x0800, CRC(538e37b2) SHA1(d283ac4d0024388b92b6494fcde63957b705bf48))
 	ROM_LOAD("rot-c117.dat", 0x1000, 0x0800, CRC(3321ff08) SHA1(d6d94fea27ef58ca648b2829b32d62fcec108c9b))
 ROM_END
 
 
-GAME(1978,  rotation,  0,  g627,  g627, g627_state,  g627,  ROT0,  "Midway",    "Rotation VIII",      GAME_IS_SKELETON_MECHANICAL)
+GAME(1978,  rotation,  0,  g627,  g627, driver_device,  0,  ROT0,  "Midway", "Rotation VIII", GAME_MECHANICAL | GAME_NOT_WORKING | GAME_IMPERFECT_KEYBOARD)