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diff --git a/src/mame/drivers/gridlee.cpp b/src/mame/drivers/gridlee.cpp
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+// license:BSD-3-Clause
+// copyright-holders:Aaron Giles
+/***************************************************************************
+
+ Videa Gridlee hardware
+
+ driver by Aaron Giles
+
+ special thanks to Howard Delman, Roger Hector and Ed Rotberg for
+ allowing distribution of the Gridlee ROMs
+
+ Based on the Bally/Sente SAC system
+
+ Games supported:
+ * Gridlee
+
+ Known bugs:
+ * analog sound hardware is unemulated
+
+****************************************************************************
+
+ Memory map
+
+****************************************************************************
+
+ ========================================================================
+ CPU #1
+ ========================================================================
+ 0000-007F R/W xxxxxxxx Sprite RAM (32 entries x 4 bytes)
+ R/W xxxxxxxx (0: image number)
+ R/W -------- (1: unused?)
+ R/W xxxxxxxx (2: Y position, offset by 17 pixels)
+ R/W xxxxxxxx (3: X position)
+ 0080-07FF R/W xxxxxxxx Program RAM
+ 0800-7FFF R/W xxxxxxxx Video RAM (256x240 pixels)
+ R/W xxxx---- (left pixel)
+ R/W ----xxxx (right pixel)
+ 9000 W -------x Player 1 LED
+ 9010 W -------x Player 2 LED
+ 9020 W -------x Coin counter
+ 9060 W -------x Unknown (written once at startup)
+ 9070 W -------x Cocktail flip
+ 9200 W --xxxxxx Palette base select
+ 9380 W -------- Watchdog reset
+ 9500 R ---xxxxx Trackball Y position
+ R ---x---- Sign of delta
+ R ----xxxx Cumulative magnitude
+ 9501 R ---xxxxx Trackball X position
+ R ---x---- Sign of delta
+ R ----xxxx Cumulative magnitude
+ 9502 R ------x- Fire button 2
+ R -------x Fire button 1
+ 9503 R --xx---- Coinage switches
+ R ----x--- 2 player start
+ R -----x-- 1 player start
+ R ------x- Right coin
+ R -------x Left coin
+ 9600 R x------- Reset game data switch
+ R -x------ Reset hall of fame switch
+ R --x----- Cocktail/upright switch
+ R ---x---- Free play switch
+ R ----xx-- Lives switches
+ R ------xx Bonus lives switches
+ 9700 R x------- VBLANK
+ R -x------ Service advance
+ R --x----- Service switch
+ 9820 R xxxxxxxx Random number generator
+ 9828-982C W ???????? Unknown
+ 9830-983F W ???????? Unknown (sound-related)
+ 9C00-9CFF R/W -------- NVRAM
+ A000-FFFF R xxxxxxxx Fixed program ROM
+ ========================================================================
+ Interrupts:
+ NMI not connected
+ IRQ generated by 32L
+ FIRQ generated by ??? (but should be around scanline 92)
+ ========================================================================
+
+***************************************************************************/
+
+
+#include "emu.h"
+#include "cpu/m6809/m6809.h"
+#include "sound/samples.h"
+#include "machine/nvram.h"
+#include "includes/gridlee.h"
+
+
+/* constants */
+#define FIRQ_SCANLINE 92
+
+/*************************************
+ *
+ * Interrupt handling
+ *
+ *************************************/
+
+TIMER_CALLBACK_MEMBER(gridlee_state::irq_off_tick)
+{
+ m_maincpu->set_input_line(M6809_IRQ_LINE, CLEAR_LINE);
+}
+
+
+TIMER_CALLBACK_MEMBER(gridlee_state::irq_timer_tick)
+{
+ /* next interrupt after scanline 256 is scanline 64 */
+ if (param == 256)
+ m_irq_timer->adjust(m_screen->time_until_pos(64), 64);
+ else
+ m_irq_timer->adjust(m_screen->time_until_pos(param + 64), param + 64);
+
+ /* IRQ starts on scanline 0, 64, 128, etc. */
+ m_maincpu->set_input_line(M6809_IRQ_LINE, ASSERT_LINE);
+
+ /* it will turn off on the next HBLANK */
+ m_irq_off->adjust(m_screen->time_until_pos(param, GRIDLEE_HBSTART));
+}
+
+
+TIMER_CALLBACK_MEMBER(gridlee_state::firq_off_tick)
+{
+ m_maincpu->set_input_line(M6809_FIRQ_LINE, CLEAR_LINE);
+}
+
+
+TIMER_CALLBACK_MEMBER(gridlee_state::firq_timer_tick)
+{
+ /* same time next frame */
+ m_firq_timer->adjust(m_screen->time_until_pos(FIRQ_SCANLINE));
+
+ /* IRQ starts on scanline FIRQ_SCANLINE? */
+ m_maincpu->set_input_line(M6809_FIRQ_LINE, ASSERT_LINE);
+
+ /* it will turn off on the next HBLANK */
+ m_firq_off->adjust(m_screen->time_until_pos(FIRQ_SCANLINE, GRIDLEE_HBSTART));
+}
+
+void gridlee_state::machine_start()
+{
+ /* create the polynomial tables */
+ poly17_init();
+
+ save_item(NAME(m_last_analog_input));
+ save_item(NAME(m_last_analog_output));
+
+ m_irq_off = machine().scheduler().timer_alloc(timer_expired_delegate(FUNC(gridlee_state::irq_off_tick),this));
+ m_irq_timer = machine().scheduler().timer_alloc(timer_expired_delegate(FUNC(gridlee_state::irq_timer_tick),this));
+ m_firq_off = machine().scheduler().timer_alloc(timer_expired_delegate(FUNC(gridlee_state::firq_off_tick),this));
+ m_firq_timer = machine().scheduler().timer_alloc(timer_expired_delegate(FUNC(gridlee_state::firq_timer_tick),this));
+}
+
+
+void gridlee_state::machine_reset()
+{
+ /* start timers to generate interrupts */
+ m_irq_timer->adjust(m_screen->time_until_pos(0));
+ m_firq_timer->adjust(m_screen->time_until_pos(FIRQ_SCANLINE));
+}
+
+
+
+/*************************************
+ *
+ * ADC handlers
+ *
+ *************************************/
+
+READ8_MEMBER(gridlee_state::analog_port_r)
+{
+ int delta, sign, magnitude;
+ UINT8 newval;
+ static const char *const portnames[] = { "TRACK0_Y", "TRACK0_X", "TRACK1_Y", "TRACK1_X" };
+
+ /* first read the new trackball value and compute the signed delta */
+ newval = ioport(portnames[offset + 2 * m_cocktail_flip])->read();
+ delta = (int)newval - (int)m_last_analog_input[offset];
+
+ /* handle the case where we wrap around from 0x00 to 0xff, or vice versa */
+ if (delta >= 0x80)
+ delta -= 0x100;
+ if (delta <= -0x80)
+ delta += 0x100;
+
+ /* just return the previous value for deltas less than 2, which are ignored */
+ if (delta >= -1 && delta <= 1)
+ return m_last_analog_output[offset];
+ m_last_analog_input[offset] = newval;
+
+ /* compute the sign and the magnitude */
+ sign = (delta < 0) ? 0x10 : 0x00;
+ magnitude = (delta < 0) ? -delta : delta;
+
+ /* add the magnitude to the running total */
+ m_last_analog_output[offset] += magnitude;
+
+ /* or in the sign bit and return that */
+ return (m_last_analog_output[offset] & 15) | sign;
+}
+
+
+
+/*************************************
+ *
+ * MM5837 noise generator
+ *
+ * NOTE: this is stolen straight from
+ * POKEY.c
+ *
+ * NOTE: this is assumed to be the
+ * same as balsente.c
+ *
+ *************************************/
+
+#define POLY17_BITS 17
+#define POLY17_SIZE ((1 << POLY17_BITS) - 1)
+#define POLY17_SHL 7
+#define POLY17_SHR 10
+#define POLY17_ADD 0x18000
+
+void gridlee_state::poly17_init()
+{
+ UINT32 i, x = 0;
+ UINT8 *p, *r;
+
+ /* allocate memory */
+ p = m_poly17 = auto_alloc_array(machine(), UINT8, 2 * (POLY17_SIZE + 1));
+ r = m_rand17 = m_poly17 + POLY17_SIZE + 1;
+
+ /* generate the polynomial */
+ for (i = 0; i < POLY17_SIZE; i++)
+ {
+ /* store new values */
+ *p++ = x & 1;
+ *r++ = x >> 3;
+
+ /* calculate next bit */
+ x = ((x << POLY17_SHL) + (x >> POLY17_SHR) + POLY17_ADD) & POLY17_SIZE;
+ }
+}
+
+
+
+/*************************************
+ *
+ * Hardware random numbers
+ *
+ *************************************/
+
+READ8_MEMBER(gridlee_state::random_num_r)
+{
+ UINT32 cc;
+
+ /* CPU runs at 1.25MHz, noise source at 100kHz --> multiply by 12.5 */
+ cc = m_maincpu->total_cycles();
+
+ /* 12.5 = 8 + 4 + 0.5 */
+ cc = (cc << 3) + (cc << 2) + (cc >> 1);
+ return m_rand17[cc & POLY17_SIZE];
+}
+
+
+
+/*************************************
+ *
+ * Misc handlers
+ *
+ *************************************/
+
+WRITE8_MEMBER(gridlee_state::led_0_w)
+{
+ set_led_status(machine(), 0, data & 1);
+ logerror("LED 0 %s\n", (data & 1) ? "on" : "off");
+}
+
+
+WRITE8_MEMBER(gridlee_state::led_1_w)
+{
+ set_led_status(machine(), 1, data & 1);
+ logerror("LED 1 %s\n", (data & 1) ? "on" : "off");
+}
+
+
+WRITE8_MEMBER(gridlee_state::gridlee_coin_counter_w)
+{
+ coin_counter_w(machine(), 0, data & 1);
+ logerror("coin counter %s\n", (data & 1) ? "on" : "off");
+}
+
+
+
+/*************************************
+ *
+ * Main CPU memory handlers
+ *
+ *************************************/
+
+/* CPU 1 read addresses */
+static ADDRESS_MAP_START( cpu1_map, AS_PROGRAM, 8, gridlee_state )
+ AM_RANGE(0x0000, 0x07ff) AM_RAM AM_SHARE("spriteram")
+ AM_RANGE(0x0800, 0x7fff) AM_RAM_WRITE(gridlee_videoram_w) AM_SHARE("videoram")
+ AM_RANGE(0x9000, 0x9000) AM_WRITE(led_0_w)
+ AM_RANGE(0x9010, 0x9010) AM_WRITE(led_1_w)
+ AM_RANGE(0x9020, 0x9020) AM_WRITE(gridlee_coin_counter_w)
+/* { 0x9060, 0x9060, unknown - only written to at startup */
+ AM_RANGE(0x9070, 0x9070) AM_WRITE(gridlee_cocktail_flip_w)
+ AM_RANGE(0x9200, 0x9200) AM_WRITE(gridlee_palette_select_w)
+ AM_RANGE(0x9380, 0x9380) AM_WRITE(watchdog_reset_w)
+ AM_RANGE(0x9500, 0x9501) AM_READ(analog_port_r)
+ AM_RANGE(0x9502, 0x9502) AM_READ_PORT("IN0")
+ AM_RANGE(0x9503, 0x9503) AM_READ_PORT("IN1")
+ AM_RANGE(0x9600, 0x9600) AM_READ_PORT("DSW")
+ AM_RANGE(0x9700, 0x9700) AM_READ_PORT("IN2") AM_WRITENOP
+ AM_RANGE(0x9820, 0x9820) AM_READ(random_num_r)
+ AM_RANGE(0x9828, 0x993f) AM_DEVWRITE("gridlee", gridlee_sound_device, gridlee_sound_w)
+ AM_RANGE(0x9c00, 0x9cff) AM_RAM AM_SHARE("nvram")
+ AM_RANGE(0xa000, 0xffff) AM_ROM
+ADDRESS_MAP_END
+
+
+
+/*************************************
+ *
+ * Port definitions
+ *
+ *************************************/
+
+static INPUT_PORTS_START( gridlee )
+ PORT_START("TRACK0_Y") /* 9500 (fake) */
+ PORT_BIT( 0xff, 0, IPT_TRACKBALL_Y ) PORT_SENSITIVITY(20) PORT_KEYDELTA(8)
+
+ PORT_START("TRACK0_X") /* 9501 (fake) */
+ PORT_BIT( 0xff, 0, IPT_TRACKBALL_X ) PORT_SENSITIVITY(20) PORT_KEYDELTA(8) PORT_REVERSE
+
+ PORT_START("TRACK1_Y") /* 9500 (fake) */
+ PORT_BIT( 0xff, 0, IPT_TRACKBALL_Y ) PORT_SENSITIVITY(20) PORT_KEYDELTA(8) PORT_COCKTAIL
+
+ PORT_START("TRACK1_X") /* 9501 (fake) */
+ PORT_BIT( 0xff, 0, IPT_TRACKBALL_X ) PORT_SENSITIVITY(20) PORT_KEYDELTA(8) PORT_REVERSE PORT_COCKTAIL
+
+ PORT_START("IN0") /* 9502 */
+ PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_BUTTON1 )
+ PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_COCKTAIL
+ PORT_BIT( 0xfc, IP_ACTIVE_LOW, IPT_UNKNOWN )
+
+ PORT_START("IN1") /* 9503 */
+ PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_COIN1 )
+ PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_COIN2 )
+ PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_START1 )
+ PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_START2 )
+ PORT_DIPNAME( 0x30, 0x00, DEF_STR( Coinage ))
+ PORT_DIPSETTING( 0x20, DEF_STR( 2C_1C ))
+ PORT_DIPSETTING( 0x00, DEF_STR( 1C_1C ))
+ PORT_DIPSETTING( 0x10, DEF_STR( 1C_2C ))
+ PORT_BIT( 0xc0, IP_ACTIVE_LOW, IPT_UNKNOWN )
+
+ PORT_START("DSW") /* 9600 */
+ PORT_DIPNAME( 0x03, 0x01, DEF_STR( Bonus_Life ))
+ PORT_DIPSETTING( 0x00, "8000 points" )
+ PORT_DIPSETTING( 0x01, "10000 points" )
+ PORT_DIPSETTING( 0x02, "12000 points" )
+ PORT_DIPSETTING( 0x03, "14000 points" )
+ PORT_DIPNAME( 0x0c, 0x04, DEF_STR( Lives ))
+ PORT_DIPSETTING( 0x00, "2" )
+ PORT_DIPSETTING( 0x04, "3" )
+ PORT_DIPSETTING( 0x08, "4" )
+ PORT_DIPSETTING( 0x0c, "5" )
+ PORT_DIPNAME( 0x10, 0x00, DEF_STR( Free_Play ))
+ PORT_DIPSETTING( 0x00, DEF_STR( Off ))
+ PORT_DIPSETTING( 0x10, DEF_STR( On ))
+ PORT_DIPNAME( 0x20, 0x00, DEF_STR( Cabinet ) )
+ PORT_DIPSETTING( 0x00, DEF_STR( Upright ) )
+ PORT_DIPSETTING( 0x20, DEF_STR( Cocktail ) )
+ PORT_DIPNAME( 0x40, 0x00, "Reset Hall of Fame" )
+ PORT_DIPSETTING( 0x00, DEF_STR( No ))
+ PORT_DIPSETTING( 0x40, DEF_STR( Yes ))
+ PORT_DIPNAME( 0x80, 0x00, "Reset Game Data" )
+ PORT_DIPSETTING( 0x00, DEF_STR( No ))
+ PORT_DIPSETTING( 0x80, DEF_STR( Yes ))
+
+ PORT_START("IN2") /* 9700 */
+ PORT_BIT( 0x1f, IP_ACTIVE_LOW, IPT_UNKNOWN )
+ PORT_SERVICE( 0x20, IP_ACTIVE_LOW )
+ PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_SERVICE1 )
+ PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_CUSTOM ) PORT_VBLANK("screen")
+INPUT_PORTS_END
+
+
+
+/*************************************
+ *
+ * Sound definitions
+ *
+ *************************************/
+
+static const char *const sample_names[] =
+{
+ "*gridlee",
+ "bounce1",
+ "bounce2",
+ 0 /* end of array */
+};
+
+/*************************************
+ *
+ * Machine driver
+ *
+ *************************************/
+
+static MACHINE_CONFIG_START( gridlee, gridlee_state )
+
+ /* basic machine hardware */
+ MCFG_CPU_ADD("maincpu", M6809, GRIDLEE_CPU_CLOCK)
+ MCFG_CPU_PROGRAM_MAP(cpu1_map)
+
+ MCFG_NVRAM_ADD_0FILL("nvram")
+
+ /* video hardware */
+ MCFG_SCREEN_ADD("screen", RASTER)
+ MCFG_SCREEN_RAW_PARAMS(GRIDLEE_PIXEL_CLOCK, GRIDLEE_HTOTAL, GRIDLEE_HBEND, GRIDLEE_HBSTART, GRIDLEE_VTOTAL, GRIDLEE_VBEND, GRIDLEE_VBSTART)
+ MCFG_SCREEN_UPDATE_DRIVER(gridlee_state, screen_update_gridlee)
+ MCFG_SCREEN_PALETTE("palette")
+
+ MCFG_PALETTE_ADD("palette", 2048)
+ MCFG_PALETTE_INIT_OWNER(gridlee_state,gridlee)
+
+ /* sound hardware */
+ MCFG_SPEAKER_STANDARD_MONO("mono")
+
+ MCFG_SOUND_ADD("gridlee", GRIDLEE, 0)
+ MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.0)
+
+ MCFG_SOUND_ADD("samples", SAMPLES, 0)
+ MCFG_SAMPLES_CHANNELS(8)
+ MCFG_SAMPLES_NAMES(sample_names)
+ MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.40)
+MACHINE_CONFIG_END
+
+
+
+/*************************************
+ *
+ * ROM definitions
+ *
+ *************************************/
+
+ROM_START( gridlee )
+ ROM_REGION( 0x10000, "maincpu", 0 )
+ ROM_LOAD( "gridfnla.bin", 0xa000, 0x1000, CRC(1c43539e) SHA1(8b4a6f5c2c22bb021937157606d2129e2b01f718) )
+ ROM_LOAD( "gridfnlb.bin", 0xb000, 0x1000, CRC(c48b91b8) SHA1(651210470ddf7c14f16f6c3046a9b8e903824ab8) )
+ ROM_LOAD( "gridfnlc.bin", 0xc000, 0x1000, CRC(6ad436dd) SHA1(f393b63077f249d34a8e85649aea58b27a0425b1) )
+ ROM_LOAD( "gridfnld.bin", 0xd000, 0x1000, CRC(f7188ddb) SHA1(eeb3f7dd8c61689cdd9992280ee1b3b5dc79a54c) )
+ ROM_LOAD( "gridfnle.bin", 0xe000, 0x1000, CRC(d5330bee) SHA1(802bb5705d4cd22d556c1bcbcf730d688ca8e8ab) )
+ ROM_LOAD( "gridfnlf.bin", 0xf000, 0x1000, CRC(695d16a3) SHA1(53d22cbedbedad8c89a964b6a38b7075c43cf03b) )
+
+ ROM_REGION( 0x4000, "gfx1", 0 )
+ ROM_LOAD( "gridpix0.bin", 0x0000, 0x1000, CRC(e6ea15ae) SHA1(2c482e25ea44aafd63ca5533b5a2e2dd8bf89365) )
+ ROM_LOAD( "gridpix1.bin", 0x1000, 0x1000, CRC(d722f459) SHA1(8cad028eefbba387bdd57fb8bb3a855ae314fb32) )
+ ROM_LOAD( "gridpix2.bin", 0x2000, 0x1000, CRC(1e99143c) SHA1(89c2f772cd15f2c37c8167a03dc4c7d1c923e4c3) )
+ ROM_LOAD( "gridpix3.bin", 0x3000, 0x1000, CRC(274342a0) SHA1(818cfd4132183d922ff4585c73f2cd6e4546c75b) )
+
+ ROM_REGION( 0x1800, "proms", 0 )
+ ROM_LOAD( "grdrprom.bin", 0x0000, 0x800, CRC(f28f87ed) SHA1(736f38c3ec5455de1266aad348ba708d7201b21a) )
+ ROM_LOAD( "grdgprom.bin", 0x0800, 0x800, CRC(921b0328) SHA1(59d1a3d3a90bd680a75adca5dd1b4682236c673b) )
+ ROM_LOAD( "grdbprom.bin", 0x1000, 0x800, CRC(04350348) SHA1(098fec3073143e0b8746e728d7d321f2a353286f) )
+ROM_END
+
+
+
+/*************************************
+ *
+ * Game drivers
+ *
+ *************************************/
+
+GAME( 1983, gridlee, 0, gridlee, gridlee, driver_device, 0, ROT0, "Videa", "Gridlee", MACHINE_SUPPORTS_SAVE | MACHINE_IMPERFECT_SOUND )