diff --git a/src/mame/drivers/spaceg.c b/src/mame/drivers/spaceg.c
index 20fd1f2b867..0b17ccb3a7c 100644
--- a/src/mame/drivers/spaceg.c
+++ b/src/mame/drivers/spaceg.c
@@ -180,7 +180,7 @@ public:
 		: driver_device(machine, config) { }
 
 	UINT8 *  videoram;
-	UINT8 *  unkram;
+	UINT8 *  colorram;
 	UINT8 *  io9400;
 	UINT8 *  io9401;
 };
@@ -198,7 +198,7 @@ static PALETTE_INIT( spaceg )
 	for (i = 0; i < 128; i++)
 		palette_set_color (machine, i, MAKE_RGB(0x00,0x00,0x00));
 
-
+	// proms are currently undumped...
 	palette_set_color (machine, 0, MAKE_RGB(0x00,0x00,0x00));	//ok czarny
 	palette_set_color (machine, 1, MAKE_RGB(0x7f,0x00,0x00));//???
 	palette_set_color (machine, 2, MAKE_RGB(0xff,0xff,0xff));	//ok+ bialy
@@ -216,41 +216,47 @@ static PALETTE_INIT( spaceg )
 	palette_set_color (machine, 13, MAKE_RGB(0x7f,0xbf,0xff));	//ok j.niebieski (jasniejszy od 9)
 	palette_set_color (machine, 14, MAKE_RGB(0x00,0xff,0xff));//???
 	palette_set_color (machine, 15, MAKE_RGB(0x7f,0x7f,0x7f));//???
-
 }
 
 static WRITE8_HANDLER( zvideoram_w )
 {
 	spaceg_state *state = space->machine->driver_data<spaceg_state>();
-	int col;
-
-	col = state->unkram[0x400];
-
-	if (col > 0x0f)
-		popmessage("color > 0x0f = %2d", col);
+	int col = state->colorram[0x400];
+	int xoff = *state->io9400 >> 5 & 7;
+	UINT16 offset2 = (offset + 0x100) & 0x1fff;
+	UINT16 sdata = data << (8 - xoff);
+	UINT16 vram_data = state->videoram[offset] << 8 | (state->videoram[offset2]);
 
+	if (col > 0x0f) popmessage("color > 0x0f = %2d", col);
 	col &= 0x0f;
 
 	switch (*state->io9401)
 	{
-	case 0x0d:	/* 1101 */
-		state->videoram[offset] &= ~data;
-		data = state->videoram[offset];
-		break;
+		// draw
+		case 0:
+			vram_data &= ~(0xff00 >> xoff);
+			// (fall through)
+		case 1:
+			vram_data |= sdata;
 
-	case 0x01:	/* 0001 */
-	case 0x00:	/* 0000 */
-		state->videoram[offset] = data;
-		break;
+			// update colorram
+			if (sdata&0xff00) state->colorram[offset] = col;
+			if (sdata&0x00ff) state->colorram[offset2] = col;
+			break;
 
-	default:
-		logerror("mode = %02x pc = %04x\n", *state->io9401, cpu_get_pc(space->cpu));
-		popmessage("mode = %02x pc = %04x\n", *state->io9401, cpu_get_pc(space->cpu));
-		return;
+		// erase
+		case 0xd:
+			vram_data &= ~sdata;
+			break;
+
+		default:
+			logerror("mode = %02x pc = %04x\n", *state->io9401, cpu_get_pc(space->cpu));
+			popmessage("mode = %02x pc = %04x\n", *state->io9401, cpu_get_pc(space->cpu));
+			return;
 	}
 
-
-	state->unkram[offset] = col;
+	state->videoram[offset]=vram_data>>8;
+	state->videoram[offset2]=vram_data&0xff;
 }
 
 
@@ -261,7 +267,7 @@ static READ8_HANDLER(spaceg_colorram_r)
 
 	if (offset < 0x400)
 	{
-		rgbcolor = (state->unkram[offset] << 1) | ((offset &0x100) >> 8);
+		rgbcolor = (state->colorram[offset] << 1) | ((offset &0x100) >> 8);
 
 		if ((offset >= 0x200) && (offset < 0x220)) /* 0xa200- 0xa21f */
 		{
@@ -276,13 +282,13 @@ static READ8_HANDLER(spaceg_colorram_r)
 			palette_set_color_rgb(space->machine, 0x10 + 0x00 + col_ind, pal3bit(rgbcolor >> 0), pal3bit(rgbcolor >> 6), pal3bit(rgbcolor >> 3));
 		}
 		else
-			logerror("palette? read from unkram offset = %04x\n",offset);
+			logerror("palette? read from colorram offset = %04x\n",offset);
 	}
 
 	if (*state->io9401 != 0x40)
-		logerror("unkram read in mode: 9401 = %02x (offset = %04x)\n", *state->io9401, offset);
+		logerror("colorram read in mode: 9401 = %02x (offset = %04x)\n", *state->io9401, offset);
 
-	return state->unkram[offset];
+	return state->colorram[offset];
 }
 
 
@@ -295,13 +301,12 @@ static VIDEO_UPDATE( spaceg )
 	{
 		int i;
 		UINT8 data = state->videoram[offs];
-
 		int y = offs & 0xff;
-		UINT8 x = ((offs >> 8) << 3) - ((*state->io9400 & 0xe0) >> 5);
+		int x = (offs >> 8) << 3;
 
 		for (i = 0; i < 8; i++)
 		{
-			*BITMAP_ADDR16(bitmap, y, x) = (data & 0x80) ? state->unkram[offs] : 0;
+			*BITMAP_ADDR16(bitmap, y, x) = (data & 0x80) ? state->colorram[offs] : 0;
 
 			x++;
 			data <<= 1;
@@ -323,7 +328,7 @@ static ADDRESS_MAP_START( spaceg_map, ADDRESS_SPACE_PROGRAM, 8 )
 	AM_RANGE(0x3000, 0x3fff) AM_ROM
 	AM_RANGE(0x7000, 0x77ff) AM_RAM
 
-	AM_RANGE(0xa000, 0xbfff) AM_RAM_READ(spaceg_colorram_r) AM_BASE_MEMBER(spaceg_state, unkram)
+	AM_RANGE(0xa000, 0xbfff) AM_RAM_READ(spaceg_colorram_r) AM_BASE_MEMBER(spaceg_state, colorram)
 	AM_RANGE(0xc000, 0xdfff) AM_RAM_WRITE(zvideoram_w) AM_BASE_MEMBER(spaceg_state, videoram)
 
 	AM_RANGE(0x9400, 0x9400) AM_WRITEONLY AM_BASE_MEMBER(spaceg_state, io9400) /* gfx ctrl */
@@ -381,18 +386,18 @@ static INPUT_PORTS_START( spaceg )
 	PORT_BIT( 0x10, IP_ACTIVE_HIGH, IPT_START2 )
 
 	PORT_START("9805")    /* player 1 */
-	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_JOYSTICK_LEFT  ) PORT_8WAY PORT_PLAYER(1)
-	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_JOYSTICK_RIGHT ) PORT_8WAY PORT_PLAYER(1)
+	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_JOYSTICK_LEFT  ) PORT_2WAY PORT_PLAYER(1)
+	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_JOYSTICK_RIGHT ) PORT_2WAY PORT_PLAYER(1)
 
 	PORT_START("9806")    /* player 2 */
-	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_JOYSTICK_LEFT  ) PORT_8WAY PORT_PLAYER(2)
-	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_JOYSTICK_RIGHT ) PORT_8WAY PORT_PLAYER(2)
+	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_JOYSTICK_LEFT  ) PORT_2WAY PORT_PLAYER(2)
+	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_JOYSTICK_RIGHT ) PORT_2WAY PORT_PLAYER(2)
 INPUT_PORTS_END
 
 
 /*************************************
  *
- *  Machine driver
+ *  Machine config
  *
  *************************************/
 
@@ -406,7 +411,7 @@ static MACHINE_CONFIG_START( spaceg, spaceg_state )
 	/* video hardware */
 	MCFG_SCREEN_ADD("screen", RASTER)
 	MCFG_SCREEN_REFRESH_RATE(60)
-	MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(0))
+	MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500)) /* not accurate */
 	MCFG_SCREEN_FORMAT(BITMAP_FORMAT_INDEXED16)
 	MCFG_SCREEN_SIZE(256, 256)
 	MCFG_SCREEN_VISIBLE_AREA(0, 255, 32, 255)
@@ -416,7 +421,7 @@ static MACHINE_CONFIG_START( spaceg, spaceg_state )
 	MCFG_VIDEO_UPDATE( spaceg )
 
 	/* sound hardware */
-	MCFG_SPEAKER_STANDARD_MONO("mono")
+//	MCFG_SPEAKER_STANDARD_MONO("mono")
 
 //  MCFG_SOUND_ADD("sn1", SN76496, 15468480/4)
 //  MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.0)
@@ -452,6 +457,10 @@ ROM_START( spaceg )
 	ROM_LOAD( "14.8g", 0x3400, 0x0400, CRC(dc9a10c2) SHA1(8fb2316d6e8aeef558d0da5029e2932abf47a6b4) )
 	ROM_LOAD( "15.9h", 0x3800, 0x0400, CRC(55e2950d) SHA1(2241c3620c9a6df8b8bd234ccee9af5d3d19a5d4) )
 	ROM_LOAD( "16.8h", 0x3c00, 0x0400, CRC(567259c4) SHA1(b2c3f7aaceabea075af6a43b89fb7331732278c8) )
+
+	ROM_REGION( 0x40, "proms", 0 )
+	ROM_LOAD( "prom1", 0x0000, 0x0020, NO_DUMP )
+	ROM_LOAD( "prom2", 0x0020, 0x0020, NO_DUMP )
 ROM_END