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// license:BSD-3-Clause
// copyright-holders:Bernd Wiebelt
/***************************************************************************
Midway Omega Race hardware
driver by Bernd Wiebelt
Games supported:
* Omega Race [2 sets]
* Delta Race (Omega Race bootleg by Allied Leisure)
Known bugs:
* none at this time
****************************************************************************
This driver is dedicated to my loving wife Natalia Wiebelt
and my daughter Lara Anna Maria
Summer 1997 Bernd Wiebelt
Many thanks to Al Kossow for the original sources and the solid documentation.
Without him, I could never had completed this driver.
--------
Omega Race Memory Map
Version 1.1 (Jul 24,1997)
---------------------
0000 - 3fff PROM
4000 - 4bff RAM (3k)
5c00 - 5cff NVRAM (256 x 4bits)
8000 - 8fff Vec RAM (4k)
9000 - 9fff Vec ROM (4k)
15 14 13 12 11 10
--+--+--+--+--+--
0 0 0 0 M8 - 2732 (4k)
0 0 0 1 L8 - 2732
0 0 1 0 K8 - 2732
0 0 1 1 J8 - 2732
0 1 - 0 0 0 RAM (3k)
0 1 - 0 0 1
0 1 - 0 1 0
0 1 - 1 1 1 4 Bit BB RAM (d0-d3)
1 - - 0 0 Vec RAM (4k)
1 - - 0 1
1 - - 1 0 Vec ROM (2k) E1
1 - - 1 1 Vec ROM (2k) F1
I/O Ports
8 Start/ (VG start)
9 WDOG/ (Reset watchdog)
A SEQRES/ (VG stop/reset?)
B RDSTOP/ d7 = stop (VG running if 0)
10 I DIP SW C4 (game ship settings)
6 5 4 3 2 1
1st bonus ship at
| | | | 0 0 40,000
| | | | 0 1 50,000
| | | | 1 0 70,000
| | | | 1 1 100,000
| | | | 2nd and 3rd bonus ships
| | 0 0 150,000 250,000
| | 0 1 250,000 500,000
| | 1 0 500,000 750,000
| | 1 1 750,000 1,500,000
| | ships per credit
0 0 1 credit = 2 ships / 2 credits = 4 ships
0 1 1 credit = 2 ships / 2 credits = 5 ships
1 0 1 credit = 3 ships / 2 credits = 6 ships
1 1 1 credit = 3 ships / 2 credits = 7 ships
11 I 7 = Test
6 = P1 Fire
5 = P1 Thrust
4 = Tilt
1 = Coin 2
0 = Coin 1
12 I 7 = 1P1CR
6 = 1P2CR
3 = 2P2CR -+
2 = 2P1CR |
1 = P2Fire |
0 = P2Thr -+ cocktail only
13 O 7 =
6 = screen reverse
5 = 2 player 2 credit start LED
4 = 2 player 1 credit start LED
3 = 1 player 1 credit start LED
2 = 1 player 1 credit start LED
1 = coin meter 2
0 = coin meter 1
14 O sound command (interrupts sound Z80)
15 I encoder 1 (d7-d2)
The encoder is a 64 position Grey Code encoder, or a
pot and A to D converter.
Unlike the quadrature inputs on Atari and Sega games,
Omega Race's controller is an absolute angle.
0x00, 0x04, 0x14, 0x10, 0x18, 0x1c, 0x5c, 0x58,
0x50, 0x54, 0x44, 0x40, 0x48, 0x4c, 0x6c, 0x68,
0x60, 0x64, 0x74, 0x70, 0x78, 0x7c, 0xfc, 0xf8,
0xf0, 0xf4, 0xe4, 0xe0, 0xe8, 0xec, 0xcc, 0xc8,
0xc0, 0xc4, 0xd4, 0xd0, 0xd8, 0xdc, 0x9c, 0x98,
0x90, 0x94, 0x84, 0x80, 0x88, 0x8c, 0xac, 0xa8,
0xa0, 0xa4, 0xb4, 0xb0, 0xb8, 0xbc, 0x3c, 0x38,
0x30, 0x34, 0x24, 0x20, 0x28, 0x2c, 0x0c, 0x08
16 I encoder 2 (d5-d0)
The inputs aren't scrambled as they are on the 1 player
encoder
17 I DIP SW C6 (coin/cocktail settings)
8 7 6 5 4 3 2 1
coin switch 1
| | | | | 0 0 0 1 coin 2 credits
| | | | | 0 0 1 1 coin 3 credits
| | | | | 0 1 0 1 coin 5 credits
| | | | | 0 1 1 4 coins 5 credits
| | | | | 1 0 0 3 coins 4 credits
| | | | | 1 0 1 2 coins 3 credits
| | | | | 1 1 0 2 coins 1 credit
| | | | | 1 1 1 1 coin 1 credit
| | | | |
| | | | | coin switch 2
| | 0 0 0 1 coin 2 credits
| | 0 0 1 1 coin 3 credits
| | 0 1 0 1 coin 5 credits
| | 0 1 1 4 coins 5 credits
| | 1 0 0 3 coins 4 credits
| | 1 0 1 2 coins 3 credits
| | 1 1 0 2 coins 1 credit
| | 1 1 1 1 coin 1 credit
| |
| 0 coin play
| 1 free play
|
0 normal
1 cocktail
display list format: (4 byte opcodes)
+------+------+------+------+------+------+------+------+
|DY07 DY06 DY05 DY04 DY03 DY02 DY01 DY00 | 0
+------+------+------+------+------+------+------+------+
|OPCD3 OPCD2 OPCD1 OPCD0 DY11 DY10 DY09 DY08 | 1 OPCD 1111 = ABBREV/
+------+------+------+------+------+------+------+------+
|DX07 DX06 DX05 DX04 DX03 DX02 DX01 DX00 | 2
+------+------+------+------+------+------+------+------+
|INTEN3 INTEN2 INTEN1 INTEN0 DX11 DX10 DX09 DX08 | 3
+------+------+------+------+------+------+------+------+
Draw relative vector 0x80 1000YYYY YYYYYYYY IIIIXXXX XXXXXXXX
Draw relative vector
and load scale 0x90 1001YYYY YYYYYYYY SSSSXXXX XXXXXXXX
Beam to absolute
screen position 0xA0 1010YYYY YYYYYYYY ----XXXX XXXXXXXX
Halt 0xB0 1011---- --------
Jump to subroutine 0xC0 1100AAAA AAAAAAAA
Return from subroutine 0xD0 1101---- --------
Jump to new address 0xE0 1110AAAA AAAAAAAA
Short vector draw 0xF0 1111YYYY IIIIXXXX
Sound Z80 Memory Map
0000 ROM
1000 RAM
15 14 13 12 11 10
0 2k prom (K5)
1 2k prom (J5)
1 1k RAM (K4,J4)
I/O (write-only)
0,1 8912 (K3)
2,3 8912 (J3)
I/O (read-only)
0 input port from main CPU.
main CPU writing port generated INT
Sound Commands:
0 - reset sound CPU
***************************************************************************/
#include "emu.h"
#include "cpu/z80/z80.h"
#include "video/vector.h"
#include "video/avgdvg.h"
#include "sound/ay8910.h"
#include "machine/gen_latch.h"
#include "machine/nvram.h"
#include "machine/watchdog.h"
#include "screen.h"
#include "speaker.h"
#include "omegrace.lh"
class omegrace_state : public driver_device
{
public:
omegrace_state(const machine_config &mconfig, device_type type, const char *tag)
: driver_device(mconfig, type, tag)
, m_maincpu(*this, "maincpu")
, m_audiocpu(*this, "audiocpu")
, m_dvg(*this, "dvg")
, m_soundlatch(*this, "soundlatch")
, m_leds(*this, "led%u", 0U)
{ }
void omegrace(machine_config &config);
void init_omegrace();
private:
TIMER_CALLBACK_MEMBER(periodic_int);
DECLARE_READ8_MEMBER(omegrace_vg_go_r);
DECLARE_READ8_MEMBER(omegrace_spinner1_r);
DECLARE_WRITE8_MEMBER(omegrace_leds_w);
void main_map(address_map &map);
void port_map(address_map &map);
void sound_map(address_map &map);
void sound_port(address_map &map);
virtual void machine_start() override;
virtual void machine_reset() override;
required_device<cpu_device> m_maincpu;
required_device<cpu_device> m_audiocpu;
required_device<dvg_device> m_dvg;
required_device<generic_latch_8_device> m_soundlatch;
output_finder<4> m_leds;
emu_timer *m_gbnmi;
};
/*************************************
*
* Machine init
*
*************************************/
void omegrace_state::machine_start()
{
m_leds.resolve();
// Interrupt caused by overflow pulses from 74LS161 clocked by 74LS393 dividing .75 MHz output of 74LS161
attotime period = attotime::from_hz(12_MHz_XTAL/16/256/12); // ~250 Hz
m_gbnmi = machine().scheduler().timer_alloc(timer_expired_delegate(FUNC(omegrace_state::periodic_int), this));
m_gbnmi->adjust(period, 0, period); // first NMI must not arrive immediately
}
void omegrace_state::machine_reset()
{
/* Omega Race expects the vector processor to be ready. */
m_dvg->reset_w();
}
TIMER_CALLBACK_MEMBER(omegrace_state::periodic_int)
{
m_maincpu->set_input_line(INPUT_LINE_IRQ0, HOLD_LINE);
m_audiocpu->pulse_input_line(INPUT_LINE_NMI, attotime::zero);
}
/*************************************
*
* Vector processor interaction
*
*************************************/
READ8_MEMBER(omegrace_state::omegrace_vg_go_r)
{
if (!machine().side_effects_disabled())
m_dvg->go_w();
return 0;
}
/*************************************
*
* Input handlers
*
*************************************/
/*
* Encoder bit mappings
* The encoder is a 64 way switch, with the inputs scrambled
* on the input port (and shifted 2 bits to the left for the
* 1 player encoder
*
* 3 6 5 4 7 2 for encoder 1 (shifted two bits left..)
*
*
* 5 4 3 2 1 0 for encoder 2 (not shifted..)
*/
static const uint8_t spinnerTable[64] =
{
0x00, 0x04, 0x14, 0x10, 0x18, 0x1c, 0x5c, 0x58,
0x50, 0x54, 0x44, 0x40, 0x48, 0x4c, 0x6c, 0x68,
0x60, 0x64, 0x74, 0x70, 0x78, 0x7c, 0xfc, 0xf8,
0xf0, 0xf4, 0xe4, 0xe0, 0xe8, 0xec, 0xcc, 0xc8,
0xc0, 0xc4, 0xd4, 0xd0, 0xd8, 0xdc, 0x9c, 0x98,
0x90, 0x94, 0x84, 0x80, 0x88, 0x8c, 0xac, 0xa8,
0xa0, 0xa4, 0xb4, 0xb0, 0xb8, 0xbc, 0x3c, 0x38,
0x30, 0x34, 0x24, 0x20, 0x28, 0x2c, 0x0c, 0x08
};
READ8_MEMBER(omegrace_state::omegrace_spinner1_r)
{
return (spinnerTable[ioport("SPIN0")->read() & 0x3f]);
}
/*************************************
*
* Output handlers
*
*************************************/
WRITE8_MEMBER(omegrace_state::omegrace_leds_w)
{
/* bits 0 and 1 are coin counters */
machine().bookkeeping().coin_counter_w(0,data & 0x01);
machine().bookkeeping().coin_counter_w(1,data & 0x02);
/* bits 2 to 5 are the start leds (4 and 5 cocktail only) */
m_leds[0] = BIT(~data, 2);
m_leds[1] = BIT(~data, 3);
m_leds[2] = BIT(~data, 4);
m_leds[3] = BIT(~data, 5);
/* bit 6 flips screen (not supported) */
}
/*************************************
*
* Main CPU memory handlers
*
*************************************/
void omegrace_state::main_map(address_map &map)
{
map(0x0000, 0x3fff).rom();
map(0x4000, 0x4bff).ram();
map(0x5c00, 0x5cff).ram().share("nvram"); /* NVRAM */
map(0x8000, 0x8fff).ram().share("dvg:vectorram").region("maincpu", 0x8000); /* vector ram */
map(0x9000, 0x9fff).rom(); /* vector rom */
}
void omegrace_state::port_map(address_map &map)
{
map.global_mask(0xff);
map(0x08, 0x08).r(FUNC(omegrace_state::omegrace_vg_go_r));
map(0x09, 0x09).r("watchdog", FUNC(watchdog_timer_device::reset_r));
map(0x0a, 0x0a).w(m_dvg, FUNC(dvg_device::reset_w));
map(0x0b, 0x0b).portr("AVGDVG"); /* vg_halt */
map(0x10, 0x10).portr("DSW1"); /* DIP SW C4 */
map(0x17, 0x17).portr("DSW2"); /* DIP SW C6 */
map(0x11, 0x11).portr("IN0"); /* Player 1 input */
map(0x12, 0x12).portr("IN1"); /* Player 2 input */
map(0x13, 0x13).w(FUNC(omegrace_state::omegrace_leds_w)); /* coin counters, leds, flip screen */
map(0x14, 0x14).w(m_soundlatch, FUNC(generic_latch_8_device::write));
map(0x15, 0x15).r(FUNC(omegrace_state::omegrace_spinner1_r)); /* 1st controller */
map(0x16, 0x16).portr("SPIN1"); /* 2nd controller (cocktail) */
}
/*************************************
*
* Sound CPU memory handlers
*
*************************************/
void omegrace_state::sound_map(address_map &map)
{
map(0x0000, 0x07ff).rom().mirror(0x800);
map(0x1000, 0x13ff).ram();
}
void omegrace_state::sound_port(address_map &map)
{
map.global_mask(0xff);
map(0x00, 0x00).r(m_soundlatch, FUNC(generic_latch_8_device::read)); // the game reads from ay1 port b, but ay8912 only has port a
map(0x00, 0x01).w("ay1", FUNC(ay8912_device::address_data_w));
map(0x02, 0x03).w("ay2", FUNC(ay8912_device::address_data_w));
}
/*************************************
*
* Port definitions
*
*************************************/
static INPUT_PORTS_START( omegrace )
PORT_START("DSW1")
PORT_DIPNAME( 0x03, 0x03, "1st Bonus Life" ) PORT_DIPLOCATION("SW1:1,2")
PORT_DIPSETTING( 0x00, "40k" )
PORT_DIPSETTING( 0x01, "50k" )
PORT_DIPSETTING( 0x02, "70k" )
PORT_DIPSETTING( 0x03, "100k" )
PORT_DIPNAME( 0x0c, 0x0c, "2nd & 3rd Bonus Life" ) PORT_DIPLOCATION("SW1:3,4")
PORT_DIPSETTING( 0x00, "150k 250k" )
PORT_DIPSETTING( 0x04, "250k 500k" )
PORT_DIPSETTING( 0x08, "500k 750k" )
PORT_DIPSETTING( 0x0c, "750k 1500k" )
PORT_DIPNAME( 0x30, 0x30, "Credit(s)/Ships" ) PORT_DIPLOCATION("SW1:5,6")
PORT_DIPSETTING( 0x00, "1C/2S 2C/4S" )
PORT_DIPSETTING( 0x10, "1C/2S 2C/5S" )
PORT_DIPSETTING( 0x20, "1C/3S 2C/6S" )
PORT_DIPSETTING( 0x30, "1C/3S 2C/7S" )
PORT_DIPNAME( 0x40, 0x40, DEF_STR( Unused ) ) PORT_DIPLOCATION("SW1:7")
PORT_DIPSETTING( 0x00, DEF_STR( Off ) )
PORT_DIPSETTING( 0x40, DEF_STR( On ) )
PORT_DIPNAME( 0x80, 0x80, DEF_STR( Unused ) ) PORT_DIPLOCATION("SW1:8")
PORT_DIPSETTING( 0x00, DEF_STR( Off ) )
PORT_DIPSETTING( 0x80, DEF_STR( On ) )
PORT_START("DSW2")
PORT_DIPNAME( 0x07, 0x07, DEF_STR( Coin_A ) ) PORT_DIPLOCATION("SW2:1,2,3")
PORT_DIPSETTING( 0x06, DEF_STR( 2C_1C ) )
PORT_DIPSETTING( 0x07, DEF_STR( 1C_1C ) )
PORT_DIPSETTING( 0x03, DEF_STR( 4C_5C ) )
PORT_DIPSETTING( 0x04, DEF_STR( 3C_4C ) )
PORT_DIPSETTING( 0x05, DEF_STR( 2C_3C ) )
PORT_DIPSETTING( 0x00, DEF_STR( 1C_2C ) )
PORT_DIPSETTING( 0x01, DEF_STR( 1C_3C ) )
PORT_DIPSETTING( 0x02, DEF_STR( 1C_5C ) )
PORT_DIPNAME( 0x38, 0x38, DEF_STR( Coin_B ) ) PORT_DIPLOCATION("SW2:4,5,6")
PORT_DIPSETTING( 0x30, DEF_STR( 2C_1C ) )
PORT_DIPSETTING( 0x38, DEF_STR( 1C_1C ) )
PORT_DIPSETTING( 0x18, DEF_STR( 4C_5C ) )
PORT_DIPSETTING( 0x20, DEF_STR( 3C_4C ) )
PORT_DIPSETTING( 0x28, DEF_STR( 2C_3C ) )
PORT_DIPSETTING( 0x00, DEF_STR( 1C_2C ) )
PORT_DIPSETTING( 0x08, DEF_STR( 1C_3C ) )
PORT_DIPSETTING( 0x10, DEF_STR( 1C_5C ) )
PORT_DIPNAME( 0x40, 0x00, DEF_STR( Free_Play ) ) PORT_DIPLOCATION("SW2:7")
PORT_DIPSETTING( 0x00, DEF_STR( Off ) )
PORT_DIPSETTING( 0x40, DEF_STR( On ) )
PORT_DIPNAME( 0x80, 0x00, DEF_STR( Cabinet ) ) PORT_DIPLOCATION("SW2:8")
PORT_DIPSETTING( 0x00, DEF_STR( Upright ) )
PORT_DIPSETTING( 0x80, DEF_STR( Cocktail ) )
PORT_START("IN0") /* port 0x11 */
PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_COIN1 )
PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_COIN2 )
PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_UNKNOWN )
PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_UNKNOWN )
PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_TILT )
PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_BUTTON2 )
PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_BUTTON1 )
PORT_SERVICE( 0x80, IP_ACTIVE_LOW )
PORT_START("IN1") /* port 0x12 */
PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_COCKTAIL
PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_COCKTAIL
PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_START2 ) PORT_NAME("2 Players Start (1 credit)")
PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_START4 ) PORT_NAME("2 Players Start (2 credits)")
PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_UNKNOWN )
PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_UNKNOWN )
PORT_BIT( 0x40, IP_ACTIVE_HIGH, IPT_START1 ) PORT_NAME("1 Player Start (1 credit)")
PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_START3 ) PORT_NAME("1 Player Start (2 credits)")
PORT_START("SPIN0") /* port 0x15 - spinner */
PORT_BIT( 0x3f, 0x00, IPT_DIAL ) PORT_SENSITIVITY(12) PORT_KEYDELTA(10)
PORT_START("SPIN1") /* port 0x16 - second spinner */
PORT_BIT( 0x3f, 0x00, IPT_DIAL ) PORT_SENSITIVITY(12) PORT_KEYDELTA(10) PORT_COCKTAIL
PORT_START("AVGDVG") /* port 0x0b */
PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_CUSTOM ) PORT_READ_LINE_DEVICE_MEMBER("dvg", dvg_device, done_r)
INPUT_PORTS_END
/*************************************
*
* Machine drivers
*
*************************************/
void omegrace_state::omegrace(machine_config &config)
{
/* basic machine hardware */
/* main CPU */
/* XTAL101 Crystal @ 12mhz */
/* through 74LS161, Pin 13 = divide by 4 */
Z80(config, m_maincpu, 12_MHz_XTAL/4);
m_maincpu->set_addrmap(AS_PROGRAM, &omegrace_state::main_map);
m_maincpu->set_addrmap(AS_IO, &omegrace_state::port_map);
/* audio CPU */
/* XTAL101 Crystal @ 12mhz */
/* through 74LS161, Pin 12 = divide by 8 */
/* Fed to CPU as 1.5mhz though line J4-D */
Z80(config, m_audiocpu, 12_MHz_XTAL/8);
m_audiocpu->set_addrmap(AS_PROGRAM, &omegrace_state::sound_map);
m_audiocpu->set_addrmap(AS_IO, &omegrace_state::sound_port);
NVRAM(config, "nvram", nvram_device::DEFAULT_ALL_0); // 5101 + battery
WATCHDOG_TIMER(config, "watchdog").set_time(attotime::from_hz(12_MHz_XTAL/16/256/256));
/* video hardware */
VECTOR(config, "vector", 0);
screen_device &screen(SCREEN(config, "screen", SCREEN_TYPE_VECTOR));
screen.set_refresh_hz(40);
screen.set_size(400, 300);
screen.set_visarea(522, 1566, 522, 1566);
screen.set_screen_update("vector", FUNC(vector_device::screen_update));
DVG(config, m_dvg, 0);
m_dvg->set_vector_tag("vector");
/* sound hardware */
SPEAKER(config, "mono").front_center();
GENERIC_LATCH_8(config, m_soundlatch);
m_soundlatch->data_pending_callback().set_inputline(m_audiocpu, INPUT_LINE_IRQ0);
/* XTAL101 Crystal @ 12mhz */
/* through 74LS92, Pin 8 = divide by 12 */
AY8912(config, "ay1", 12_MHz_XTAL/12).add_route(ALL_OUTPUTS, "mono", 0.25);
AY8912(config, "ay2", 12_MHz_XTAL/12).add_route(ALL_OUTPUTS, "mono", 0.25);
}
/*************************************
*
* ROM definitions
*
*************************************/
ROM_START( omegrace )
ROM_REGION( 0x10000, "maincpu", 0 )
ROM_LOAD( "omega.m7", 0x0000, 0x1000, CRC(0424d46e) SHA1(cc1ac6c06ba6f6e8466fa08286a0c70b5335af33) )
ROM_LOAD( "omega.l7", 0x1000, 0x1000, CRC(edcd7a7d) SHA1(5d142de2f48b01d563578a54fd5540e5d0ac8f4c) )
ROM_LOAD( "omega.k7", 0x2000, 0x1000, CRC(6d10f197) SHA1(9609a0cbeeef2efa10d49cde9f0afdca96e9c2f8) )
ROM_LOAD( "omega.j7", 0x3000, 0x1000, CRC(8e8d4b54) SHA1(944192c0f6f0cdb25d492ee9f33959d38a1062f2) )
ROM_LOAD( "omega.e1", 0x9000, 0x0800, CRC(1d0fdf3a) SHA1(3333397a9745874cea1dd6a1bda783cc59393b55) )
ROM_LOAD( "omega.f1", 0x9800, 0x0800, CRC(d44c0814) SHA1(2f216ee6de88bbe09775619003aee2d5aa8c554d) )
ROM_REGION( 0x10000, "audiocpu", 0 )
ROM_LOAD( "sound.k5", 0x0000, 0x0800, CRC(7d426017) SHA1(370f0fb5608819de873c845f6010cbde75a9818e) )
ROM_REGION( 0x100, "dvg:prom", 0 )
ROM_LOAD( "dvgprom.bin", 0x0000, 0x0100, CRC(d481e958) SHA1(d8790547dc539e25984807573097b61ec3ffe614) )
ROM_END
ROM_START( omegrace2 )
ROM_REGION( 0x10000, "maincpu", 0 )
ROM_LOAD( "o.r._1a.m7", 0x0000, 0x1000, CRC(f8539d46) SHA1(bb0c6bc2a84e904d1cb00822052c53c0a8ff1083) )
ROM_LOAD( "o.r._2a.l7", 0x1000, 0x1000, CRC(0ff70783) SHA1(5fceaaea1439c3ae408a45f4d7839ec56b71504c) )
ROM_LOAD( "o.r._3a.k7", 0x2000, 0x1000, CRC(6349130d) SHA1(a1ff62044d9e59294f56079e704beeebc65a56aa) )
ROM_LOAD( "o.r._4a.j7", 0x3000, 0x1000, CRC(0a5ef64a) SHA1(42bcc5d5bfe11af4b26ba7753d83e121eef4b597) )
ROM_LOAD( "o.r._vector_i_6-1-81.e1", 0x9000, 0x0800, CRC(1d0fdf3a) SHA1(3333397a9745874cea1dd6a1bda783cc59393b55) )
ROM_LOAD( "o.r._vector_ii_6-1-81.f1", 0x9800, 0x0800, CRC(d44c0814) SHA1(2f216ee6de88bbe09775619003aee2d5aa8c554d) )
ROM_REGION( 0x10000, "audiocpu", 0 )
ROM_LOAD( "o.r.r._audio_6-1-81.k5", 0x0000, 0x0800, CRC(7d426017) SHA1(370f0fb5608819de873c845f6010cbde75a9818e) )
ROM_REGION( 0x100, "dvg:prom", 0 )
ROM_LOAD( "dvgprom.bin", 0x0000, 0x0100, CRC(d481e958) SHA1(d8790547dc539e25984807573097b61ec3ffe614) )
ROM_END
ROM_START( deltrace )
ROM_REGION( 0x10000, "maincpu", 0 )
ROM_LOAD( "omega.m7", 0x0000, 0x1000, CRC(0424d46e) SHA1(cc1ac6c06ba6f6e8466fa08286a0c70b5335af33) )
ROM_LOAD( "omega.l7", 0x1000, 0x1000, CRC(edcd7a7d) SHA1(5d142de2f48b01d563578a54fd5540e5d0ac8f4c) )
ROM_LOAD( "omega.k7", 0x2000, 0x1000, CRC(6d10f197) SHA1(9609a0cbeeef2efa10d49cde9f0afdca96e9c2f8) )
ROM_LOAD( "delta.j7", 0x3000, 0x1000, CRC(8ef9541e) SHA1(89e34f50a958ac60c5f223bcb6c1c14796b903c7) )
ROM_LOAD( "omega.e1", 0x9000, 0x0800, CRC(1d0fdf3a) SHA1(3333397a9745874cea1dd6a1bda783cc59393b55) )
ROM_LOAD( "omega.f1", 0x9800, 0x0800, CRC(d44c0814) SHA1(2f216ee6de88bbe09775619003aee2d5aa8c554d) )
ROM_REGION( 0x10000, "audiocpu", 0 )
ROM_LOAD( "sound.k5", 0x0000, 0x0800, CRC(7d426017) SHA1(370f0fb5608819de873c845f6010cbde75a9818e) )
ROM_REGION( 0x100, "dvg:prom", 0 )
ROM_LOAD( "dvgprom.bin", 0x0000, 0x0100, CRC(d481e958) SHA1(d8790547dc539e25984807573097b61ec3ffe614) )
ROM_END
/*************************************
*
* Game specific initialization
*
*************************************/
void omegrace_state::init_omegrace()
{
int len = memregion("dvg:prom")->bytes();
uint8_t *prom = memregion("dvg:prom")->base();
/* Omega Race has two pairs of the state PROM output
* lines swapped before going into the decoder.
* Since all other avg/dvg games connect the PROM
* in a consistent way to the decoder, we swap the bits
* here. */
for (int i = 0; i < len; i++)
prom[i] = bitswap<8>(prom[i],7,6,5,4,1,0,3,2);
}
/*************************************
*
* Game drivers
*
*************************************/
GAMEL(1981, omegrace, 0, omegrace, omegrace, omegrace_state, init_omegrace, ROT0, "Midway", "Omega Race (set 1)", MACHINE_NO_COCKTAIL | MACHINE_SUPPORTS_SAVE, layout_omegrace )
GAMEL(1981, omegrace2, omegrace, omegrace, omegrace, omegrace_state, init_omegrace, ROT0, "Midway", "Omega Race (set 2)", MACHINE_NO_COCKTAIL | MACHINE_SUPPORTS_SAVE, layout_omegrace )
GAMEL(1981, deltrace, omegrace, omegrace, omegrace, omegrace_state, init_omegrace, ROT0, "bootleg (Allied Leisure)", "Delta Race", MACHINE_NO_COCKTAIL | MACHINE_SUPPORTS_SAVE, layout_omegrace )
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