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path: root/src/mame/drivers/splus.cpp
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// license:BSD-3-Clause
// copyright-holders:Jim Stolis
/**********************************************************************************

    S-PLUS (S+)

    Driver by Jim Stolis.

    --- Technical Notes ---

    Name:    S+
    Company: IGT - International Game Technology
    Year:    1994

    Hardware:

    CPU =  INTEL 83c02       ; I8052 compatible
    SND =  AY-3-8912         ; AY8910 compatible

    History:

***********************************************************************************/
#include "emu.h"
#include "sound/ay8910.h"
#include "machine/nvram.h"
#include "cpu/mcs51/mcs51.h"
#include "machine/i2cmem.h"

#include "splus.lh"

#define DEBUG_OUTPUT 0

class splus_state : public driver_device
{
public:
	splus_state(const machine_config &mconfig, device_type type, const char *tag)
		: driver_device(mconfig, type, tag),
		m_cmosl_ram(*this, "cmosl"),
		m_cmosh_ram(*this, "cmosh"),
		m_program_ram(*this, "program_ram"),
		m_reel_ram(*this, "reel_ram"),
		m_io_port(*this, "io_port"),
		m_i10(*this, "I10"),
		m_i20(*this, "I20"),
		m_i30(*this, "I30"),
		m_sensor(*this, "SENSOR"),
		m_maincpu(*this, "maincpu"),
		m_i2cmem(*this, "i2cmem")
	{
		m_sda_dir = 0;
		m_coin_state = 0;
		m_last_cycles = 0;

		m_bank10 = 0x00;
		m_bank20 = 0x00;
		m_bank30 = 0x00;
		m_bank40 = 0x00;

		m_p1_reels = 0x00;
		m_p1_unknown = 0x00;
	}

	UINT32 screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
	{
		return 0;
	}

	// Pointers to External RAM
	required_shared_ptr<UINT8> m_cmosl_ram;
	required_shared_ptr<UINT8> m_cmosh_ram;

	// Program and Reel Data
	optional_shared_ptr<UINT8> m_program_ram;
	required_shared_ptr<UINT8> m_reel_ram;

	// IO Ports
	required_shared_ptr<UINT8> m_io_port;
	required_ioport m_i10;
	required_ioport m_i20;
	required_ioport m_i30;
	required_ioport m_sensor;

	// EEPROM States
	int m_sda_dir;

	// Coin-In States
	UINT8 m_coin_state;
	UINT64 m_last_cycles;
	UINT64 m_last_coin_out;
	UINT8 m_coin_out_state;

	UINT8 m_bank10;
	UINT8 m_bank20;
	UINT8 m_bank30;
	UINT8 m_bank40;

	UINT8 m_p1_reels;
	UINT8 m_p1_unknown;

	INT16 m_stepper_pos[5];
	UINT8 m_stop_pos[5];

	DECLARE_WRITE8_MEMBER(splus_io_w);
	DECLARE_WRITE8_MEMBER(splus_load_pulse_w);
	DECLARE_WRITE8_MEMBER(splus_serial_w);
	DECLARE_WRITE8_MEMBER(splus_7seg_w);
	DECLARE_WRITE8_MEMBER(splus_duart_w);
	DECLARE_READ8_MEMBER(splus_serial_r);
	DECLARE_READ8_MEMBER(splus_m_reel_ram_r);
	DECLARE_READ8_MEMBER(splus_io_r);
	DECLARE_READ8_MEMBER(splus_duart_r);
	DECLARE_READ8_MEMBER(splus_watchdog_r);
	DECLARE_READ8_MEMBER(splus_registers_r);
	DECLARE_WRITE8_MEMBER(i2c_nvram_w);
	DECLARE_READ8_MEMBER(splus_reel_optics_r);
	DECLARE_DRIVER_INIT(splus);
	required_device<cpu_device> m_maincpu;
	required_device<i2cmem_device> m_i2cmem;
};

/* Static Variables */
#define MAX_STEPPER         200     // 1.8 Degree Stepper Motor = 200 full-steps per revolution, but 400 when in half-step mode
#define STEPPER_DIVISOR     9.09 //18.18    // To allow for 22 stop positions

static const UINT8 optics[200] = {
	0x07, 0x07, 0x00, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x07, 0x07, 0x00, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x07, 0x07, 0x00, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x07, 0x07, 0x00, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x07, 0x07, 0x00, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x07,
	0x07, 0x07, 0x00, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x07, 0x07, 0x00, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x07, 0x07, 0x00, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x07, 0x07, 0x00, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x07, 0x07, 0x00, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x07, 0x07, 0x00, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x00, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07 };

#define MASTER_CLOCK        XTAL_20MHz
#define CPU_CLOCK           ((MASTER_CLOCK)/2)      /* divided by 2 - 7474 */
#define SOUND_CLOCK         ((MASTER_CLOCK)/12)


/*****************
* Write Handlers *
******************/

WRITE8_MEMBER(splus_state::splus_io_w)
{
	// P1.0 = Reel 1 Controller
	// P1.1 = Reel 2 Controller
	// P1.2 = Reel 3 Controller
	// P1.3 = Reel 4 Controller
	// P1.4 = Reel 5 Controller
	// P1.5 = 7-seg display, door
	// P1.6 = 7-seg display, prog
	// P1.7 = Unknown
	int x = 0;

	// Process Port 1
	if (offset == 1 && ((data & 0x1f) != 0x00)) {
		// Unknown Bit 7
		m_p1_unknown = (~data & 0x80);

		// Stepper Motor Engaged
		if (((m_bank40 >> 0) & 1) == 0x01) {
			// Reel Controllers Only
			m_p1_reels = (data & 0x1f);

			// Loop through Reel Controllers
			for (x = 0; x < 5; x++) {
				// Test Reel Controller
				if (((m_p1_reels >> x) & 1) == 0x01) {
					// Forward Direction
					if (((m_bank10 >> 5) & 1) == 0x01) {
						m_stepper_pos[x]++;
						if (m_stepper_pos[x] == MAX_STEPPER)
							m_stepper_pos[x] = 0;
					} else {
						m_stepper_pos[x]--;
						if (m_stepper_pos[x] < 0)
							m_stepper_pos[x] = MAX_STEPPER - 1;
					}
					m_stop_pos[x] = (int)(m_stepper_pos[x] / STEPPER_DIVISOR);
				}
			}
		}
#if DEBUG_OUTPUT
		if ((data & 0x1f) == 0x01)
			osd_printf_info("Steppers %02X-%02X-%02X-%02X-%02X Motor=%02X Dir=%02X reels=%02X unk=%02X\n", m_stop_pos[0],m_stop_pos[1],m_stop_pos[2],m_stop_pos[3],m_stop_pos[4],((m_bank40 >> 0) & 1),((m_bank10 >> 5) & 1),(data & 0x1f), m_p1_unknown);
#endif
	}

	m_io_port[offset] = data;
}

WRITE8_MEMBER(splus_state::splus_load_pulse_w)
{
//  UINT8 out = 0;
//    out = ((~m_io_port[1] & 0xf0)>>4); // Output Bank
}

WRITE8_MEMBER(splus_state::splus_serial_w)
{
	UINT8 out = 0;
	out = ((~m_io_port[1] & 0xe0)>>5); // Output Bank

	switch (out)
	{
		case 0x00: // Bank 10
			if (((m_bank10 >> 0) & 1) != ((data >> 0) & 1)) {
#if DEBUG_OUTPUT
				osd_printf_info("Coin Drop Meter =%02X\n",(data >> 0) & 1);
#endif
			}
			if (((m_bank10 >> 1) & 1) != ((data >> 1) & 1)) {
#if DEBUG_OUTPUT
				osd_printf_info("Coin Out Meter =%02X\n",(data >> 1) & 1);
#endif
			}
			if (((m_bank10 >> 2) & 1) != ((data >> 2) & 1)) {
#if DEBUG_OUTPUT
				osd_printf_info("Coin In Meter =%02X\n",(data >> 2) & 1);
#endif
			}
			if (((m_bank10 >> 3) & 1) != ((data >> 3) & 1)) {
				//osd_printf_info("B Switch for SDS =%02X\n",(data >> 3) & 1);
			}
			if (((m_bank10 >> 4) & 1) != ((data >> 4) & 1)) {
#if DEBUG_OUTPUT
				osd_printf_info("Hopper Drive 2 =%02X\n",(data >> 4) & 1);
#endif
			}
			if (((m_bank10 >> 5) & 1) != ((data >> 5) & 1)) {
#if DEBUG_OUTPUT
				osd_printf_info("Stepper Motor Direction =%02X\n",(data >> 5) & 1);
#endif
			}
			if (((m_bank10 >> 6) & 1) != ((data >> 6) & 1)) {
#if DEBUG_OUTPUT
				osd_printf_info("Mechanical Bell =%02X\n",(data >> 6) & 1);
#endif
			}
			if (((m_bank10 >> 7) & 1) != ((data >> 7) & 1)) {
#if DEBUG_OUTPUT
				osd_printf_info("Cancelled Credits Meter =%02X\n",(data >> 7) & 1);
#endif
			}
			m_bank10 = data;

			machine().output().set_value("s_bnk10",(data >> 0) & 1); // Coin Drop Meter
			machine().output().set_value("s_bnk11",(data >> 1) & 1); // Coin Out Meter
			machine().output().set_value("s_bnk12",(data >> 2) & 1); // Coin In Meter
			machine().output().set_value("s_bnk13",(data >> 3) & 1); // B Switch for SDS
			machine().output().set_value("s_bnk14",(data >> 4) & 1); // Hopper Drive 2
			machine().output().set_value("s_bnk15",(data >> 5) & 1); // Stepper Motor Direction
			machine().output().set_value("s_bnk16",(data >> 6) & 1); // Mechanical Bell
			machine().output().set_value("s_bnk17",(data >> 7) & 1); // Cancelled Credits Meter
			break;
		case 0x01: // Bank 20
			if (((m_bank20 >> 5) & 1) != ((data >> 5) & 1)) {
#if DEBUG_OUTPUT
				osd_printf_info("Games Played Meter =%02X\n",(data >> 5) & 1);
#endif
			}
			if (((m_bank20 >> 6) & 1) != ((data >> 6) & 1)) {
#if DEBUG_OUTPUT
				osd_printf_info("Bill Acceptor Enable =%02X\n",(data >> 6) & 1);
#endif
			}
			if (((m_bank20 >> 7) & 1) != ((data >> 7) & 1)) {
#if DEBUG_OUTPUT
				osd_printf_info("Jackpots Meter =%02X\n",(data >> 7) & 1);
#endif
			}
			m_bank20 = data;

			machine().output().set_value("s_bnk20",(data >> 0) & 1); // Payline Lamp 3
			machine().output().set_value("s_bnk21",(data >> 1) & 1); // Payline Lamp 4
			machine().output().set_value("s_bnk22",(data >> 2) & 1); // Payline Lamp 5
			machine().output().set_value("s_bnk23",(data >> 3) & 1); // Payline Lamp 6
			machine().output().set_value("s_bnk24",(data >> 4) & 1); // Door Optics Transmitter
			machine().output().set_value("s_bnk25",(data >> 5) & 1); // Games Played Meter
			machine().output().set_value("s_bnk26",(data >> 6) & 1); // Bill Acceptor Enable
			machine().output().set_value("s_bnk27",(data >> 7) & 1); // Jackpots Meter
			break;
		case 0x02: // Bank 30
			if (((m_bank30 >> 2) & 1) != ((data >> 2) & 1)) {
#if DEBUG_OUTPUT
				osd_printf_info("Handle Release =%02X\n",(data >> 2) & 1);
#endif
			}
			if (((m_bank30 >> 3) & 1) != ((data >> 3) & 1)) {
#if DEBUG_OUTPUT
				osd_printf_info("Diverter =%02X\n",(data >> 3) & 1);
#endif
			}
			if (((m_bank30 >> 4) & 1) != ((data >> 4) & 1)) {
#if DEBUG_OUTPUT
				osd_printf_info("Coin Lockout =%02X\n",(data >> 4) & 1);
#endif
			}
			if (((m_bank30 >> 5) & 1) != ((data >> 5) & 1)) {
#if DEBUG_OUTPUT
				osd_printf_info("Hopper Drive 1 =%02X\n",(data >> 5) & 1);
#endif
			}
			m_bank30 = data;

			machine().output().set_value("s_bnk30",(data >> 0) & 1); // Change Candle Lamp Bottom
			machine().output().set_value("s_bnk31",(data >> 1) & 1); // Change Candle Lamp Top
			machine().output().set_value("s_bnk32",(data >> 2) & 1); // Handle Release
			machine().output().set_value("s_bnk33",(data >> 3) & 1); // Diverter
			machine().output().set_value("s_bnk34",(data >> 4) & 1); // Coin Lockout
			machine().output().set_value("s_bnk35",(data >> 5) & 1); // Hopper Drive 1
			machine().output().set_value("s_bnk36",(data >> 6) & 1); // Payline Lamp 1
			machine().output().set_value("s_bnk37",(data >> 7) & 1); // Payline Lamp 2
			break;
		case 0x04: // Bank 40
			if (((m_bank40 >> 0) & 1) != ((data >> 0) & 1)) {
#if DEBUG_OUTPUT
				osd_printf_info("Stepper Motor Power Supply =%02X\n",(data >> 0) & 1);
#endif
			}
			if (((m_bank40 >> 3) & 1) != ((data >> 3) & 1)) {
#if DEBUG_OUTPUT
				osd_printf_info("Jackpot/Hand Pay Lamp =%02X\n",(data >> 3) & 1);
#endif
			}
			m_bank40 = data;

			machine().output().set_value("s_bnk40",(data >> 0) & 1); // Stepper Motor Power Supply
			machine().output().set_value("s_bnk41",(data >> 1) & 1); // Insert Coin Lamp
			machine().output().set_value("s_bnk42",(data >> 2) & 1); // Coin Accepted Lamp
			machine().output().set_value("s_bnk43",(data >> 3) & 1); // Jackpot/Hand Pay Lamp
			machine().output().set_value("s_bnk44",(data >> 4) & 1); // Play Max Credits Lamp
			machine().output().set_value("s_bnk45",(data >> 5) & 1); // Bet One Credit Lamp
			machine().output().set_value("s_bnk46",(data >> 6) & 1); // Cashout Credit Lamp
			machine().output().set_value("s_bnk47",(data >> 7) & 1); // Spin Button Lamp
			break;
	}
}

WRITE8_MEMBER(splus_state::splus_7seg_w)
{
	static const UINT8 ls48_map[16] = { 0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7c,0x07,0x7f,0x67,0x58,0x4c,0x62,0x69,0x78,0x00 };

	UINT8 seg;
	UINT8 val;

	seg = ((~data & 0xf0)>>4); // Segment Number
	val = (~data & 0x0f); // Digit Value

	// Need to add ~m_io_port[1]-1 to seg value
	if (seg < 0x0a && (m_io_port[1] & 0xe0) == 0xe0)
		machine().output().set_digit_value(seg, ls48_map[val]);
}

WRITE8_MEMBER(splus_state::splus_duart_w)
{
	// Used for Slot Accounting System Communication
}

WRITE8_MEMBER(splus_state::i2c_nvram_w)
{
	m_i2cmem->write_scl(BIT(data, 2));
	m_sda_dir = BIT(data, 1);
	m_i2cmem->write_sda(BIT(data, 0));
}

/****************
* Read Handlers *
****************/

READ8_MEMBER(splus_state::splus_serial_r)
{
	UINT8 coin_out = 0x00;
	UINT8 coin_optics = 0x00;
	UINT8 door_optics = 0x00;
	UINT32 curr_cycles = m_maincpu->total_cycles();

	UINT8 in = 0x00;
	UINT8 val = 0x00;
	in = ((~m_io_port[1] & 0xe0)>>5); // Input Bank

	switch (in)
	{
		case 0x00: // Bank 40
			// Reel #1 - 0=Low State, 1=High State
			// Reel #2 - The state of Reel 1-5 inputs depends upon where each reel has stopped
			// Reel #3
			// Reel #4
			// Reel #5
			// Unknown
			// Unknown
			// Unknown
			val = 0xaa;
			break;
		case 0x01: // Bank 10
			// Test for Coin-In
			if ((m_sensor->read() & 0x01) == 0x01 && m_coin_state == 0) {
				m_coin_state = 1; // Start Coin Cycle
				m_last_cycles = m_maincpu->total_cycles();
#if DEBUG_OUTPUT
				osd_printf_info("coin=%02X\n", m_coin_state);
#endif
			} else {
				/* Process Next Coin Optic State */
				if (curr_cycles - m_last_cycles > 10000 && m_coin_state != 0) {
					m_coin_state++;
					if (m_coin_state > 5)
						m_coin_state = 0;
					m_last_cycles = m_maincpu->total_cycles();
#if DEBUG_OUTPUT
					osd_printf_info("coin=%02X\n", m_coin_state);
#endif
				}
			}

			// Set Coin State
			switch (m_coin_state)
			{
				case 0x00: // No Coin
					coin_optics = 0x00;
					break;
				case 0x01: // Optic A
					coin_optics = 0x01;
					break;
				case 0x02: // Optic AB
					coin_optics = 0x03;
					break;
				case 0x03: // Optic ABC
					coin_optics = 0x07;
					break;
				case 0x04: // Optic BC
					coin_optics = 0x06;
					break;
				case 0x05: // Optic C
					coin_optics = 0x04;
					break;
			}

			// Determine Door Optics
			if ((m_i10->read() & 0x08) == 0x08)
				door_optics = 0x08;
			else
				door_optics = (((m_bank20 >> 4) & 1) << 3); // Use Door Optics Transmitter

			// Test if Hopper 1 and Hopper 2 Motors On
			if (((m_bank10 >> 4) & 1) || ((m_bank30 >> 5) & 1)) {
				if (m_coin_out_state == 0)
					m_coin_out_state = 3;
			} else {
				m_coin_out_state = 0;
			}

			// Process Coin Out
			if (curr_cycles - m_last_coin_out > 700000 && m_coin_out_state != 0) {
				if (m_coin_out_state != 2) {
					m_coin_out_state = 2; // Coin-Out Off
				} else {
					m_coin_out_state = 3; // Coin-Out On
				}

				m_last_coin_out = m_maincpu->total_cycles();
			}

			// Set Coin Out State
			switch (m_coin_out_state)
			{
				case 0x00: // No Coin-Out
					coin_out = 0x00;
					break;
				case 0x01: // First Coin-Out On
					coin_out = 0x10;
					break;
				case 0x02: // Coin-Out Off
					coin_out = 0x00;
					break;
				case 0x03: // Additional Coin-Out On
					coin_out = 0x10;
					break;
			}

			val = val | coin_optics; // Coin In A B C
			val = val | door_optics; // Door Optics Receiver
			val = val | coin_out; // Hopper Coin OutR
			val = val | 0x00; // Hopper Full
			val = val | (m_i10->read() & 0x40); // Handle/Spin Button
			val = val | (m_i10->read() & 0x80); // Jackpot Reset Key
			break;
		case 0x02: // Bank 20
			val = val | (m_i20->read() & 0x01); // Bet One Credit
			val = val | (m_i20->read() & 0x02); // Play Max Credits
			val = val | (m_i20->read() & 0x04); // Cash Out
			val = val | (m_i20->read() & 0x08); // Change Request
			val = val | 0x00; // Reel Mechanism
			val = val | (m_i20->read() & 0x20); // Self Test Button
			val = val | 0x40; // Card Cage
			val = val | 0x80; // Bill Acceptor
			break;
		case 0x04: // Bank 30
			// Reserved
			val = val | (m_i30->read() & 0x02); // Drop Door
			// Jackpot to Credit Key
			// Reserved
			// Reserved
			// Reserved
			// Reserved
			// Reserved
			break;
	}
	return val;
}

READ8_MEMBER(splus_state::splus_m_reel_ram_r)
{
	return m_reel_ram[offset];
}

READ8_MEMBER(splus_state::splus_io_r)
{
	if (offset == 3)
		return m_io_port[offset] & 0xf3; // Ignore Int0 and Int1, or machine will loop forever waiting
	else
		return m_io_port[offset];
}

READ8_MEMBER(splus_state::splus_duart_r)
{
	// Used for Slot Accounting System Communication
	return 0x00;
}

READ8_MEMBER(splus_state::splus_watchdog_r)
{
	return 0x00; // Watchdog
}

READ8_MEMBER(splus_state::splus_registers_r)
{
	return 0xff; // Reset Registers in Real Time Clock
}

READ8_MEMBER(splus_state::splus_reel_optics_r)
{
/*
        Bit 0 = REEL #1
        Bit 1 = REEL #2
        Bit 2 = REEL #3
        Bit 3 = REEL #4
        Bit 4 = REEL #5
        Bit 5 = ???
        Bit 6 = ???
        Bit 7 = I2C EEPROM SDA
*/
	UINT8 reel_optics = 0x00;
	UINT8 sda = 0;

	// Return Reel Positions
	reel_optics = (optics[199-(m_stepper_pos[4])] & 0x10) | (optics[199-(m_stepper_pos[3])] & 0x08) | (optics[199-(m_stepper_pos[2])] & 0x04) | (optics[199-(m_stepper_pos[1])] & 0x02) | (optics[199-(m_stepper_pos[0])] & 0x01);

	if(!m_sda_dir)
	{
		sda = m_i2cmem->read_sda();
	}

	reel_optics = reel_optics | 0x40 | (sda<<7);

	return reel_optics;
}

/**************
* Driver Init *
***************/

DRIVER_INIT_MEMBER(splus_state,splus)
{
	UINT8 *reel_data = memregion( "reeldata" )->base();

	// Load Reel Data
	memcpy(m_reel_ram, &reel_data[0x0000], 0x2000);
}


/*************************
* Memory map information *
*************************/

static ADDRESS_MAP_START( splus_map, AS_PROGRAM, 8, splus_state )
	AM_RANGE(0x0000, 0xffff) AM_ROM AM_SHARE("prograram")
ADDRESS_MAP_END

static ADDRESS_MAP_START( splus_iomap, AS_IO, 8, splus_state )
	// Serial I/O
	AM_RANGE(0x0000, 0x0000) AM_READ(splus_serial_r) AM_WRITE(splus_serial_w)

	// Battery-backed RAM (Lower 4K) 0x1500-0x16ff eeprom staging area
	AM_RANGE(0x1000, 0x1fff) AM_RAM AM_SHARE("cmosl")

	// Watchdog, 7-segment Display
	AM_RANGE(0x2000, 0x2000) AM_READWRITE(splus_watchdog_r, splus_7seg_w)

	// DUART
	AM_RANGE(0x3000, 0x300f) AM_READWRITE(splus_duart_r, splus_duart_w)

	// Dip Switches, Sound
	AM_RANGE(0x4000, 0x4000) AM_READ_PORT("SW1") AM_DEVWRITE("aysnd", ay8910_device, address_w)
	AM_RANGE(0x4001, 0x4001) AM_DEVWRITE("aysnd", ay8910_device, data_w)

	// Reel Optics, EEPROM
	AM_RANGE(0x5000, 0x5000) AM_READ(splus_reel_optics_r) AM_WRITE(i2c_nvram_w)

	// Reset Registers in Realtime Clock, Serial I/O Load Pulse
	AM_RANGE(0x6000, 0x6000) AM_READWRITE(splus_registers_r, splus_load_pulse_w)

	// Battery-backed RAM (Upper 4K)
	AM_RANGE(0x7000, 0x7fff) AM_RAM AM_SHARE("cmosh")

	// SSxxxx Reel Chip
	AM_RANGE(0x8000, 0x9fff) AM_READ(splus_m_reel_ram_r) AM_SHARE("reel_ram")

	// Ports start here
	AM_RANGE(MCS51_PORT_P0, MCS51_PORT_P3) AM_READ(splus_io_r) AM_WRITE(splus_io_w) AM_SHARE("io_port")
ADDRESS_MAP_END

/*************************
*      Input ports       *
*************************/

static INPUT_PORTS_START( splus )
	PORT_START("I10")
	PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_UNKNOWN ) PORT_NAME("Door") PORT_CODE(KEYCODE_O) PORT_TOGGLE
	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_UNKNOWN ) PORT_NAME("Spin") PORT_CODE(KEYCODE_Q)
	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_UNKNOWN ) PORT_NAME("Jackpot Reset") PORT_CODE(KEYCODE_L)

	PORT_START("I20")
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_UNKNOWN ) PORT_NAME("Play Credit") PORT_CODE(KEYCODE_R)
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_UNKNOWN ) PORT_NAME("Max Bet") PORT_CODE(KEYCODE_W)
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_UNKNOWN ) PORT_NAME("Cashout") PORT_CODE(KEYCODE_T)
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_UNKNOWN ) PORT_NAME("Change Request") PORT_CODE(KEYCODE_Y)
	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_UNKNOWN ) PORT_NAME("Self Test") PORT_CODE(KEYCODE_K)

	PORT_START("I30")
	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_UNKNOWN ) PORT_NAME("Drop Door") PORT_CODE(KEYCODE_D) PORT_TOGGLE

	PORT_START("SENSOR")
	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_COIN1) PORT_NAME("Coin In") PORT_IMPULSE(1)

	PORT_START("SW1")
	PORT_DIPNAME( 0x01, 0x01, "Hopper Limit 1" )
	PORT_DIPSETTING(    0x01, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
	PORT_DIPNAME( 0x02, 0x02, "Hopper Limit 2" )
	PORT_DIPSETTING(    0x02, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
	PORT_DIPNAME( 0x04, 0x04, "Sound Generator" )
	PORT_DIPSETTING(    0x04, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
	PORT_DIPNAME( 0x08, 0x08, "Game Speed/Bills to Hopper" ) // Either Game Speed or Bills to Hopper depending on game
	PORT_DIPSETTING(    0x08, "Normal/Set in Self Test" )
	PORT_DIPSETTING(    0x00, "Fast/Auto Exchange" )
	PORT_DIPNAME( 0x10, 0x10, "Progressives" )
	PORT_DIPSETTING(    0x10, DEF_STR( None ) )
	PORT_DIPSETTING(    0x00, "Allow" )
	PORT_DIPNAME( 0x20, 0x20, "High/Low Progressives" )
	PORT_DIPSETTING(    0x20, "Single Level Alternating" )
	PORT_DIPSETTING(    0x00, "High/Low" )
	PORT_DIPNAME( 0x40, 0x40, "Double Progressives" )
	PORT_DIPSETTING(    0x40, DEF_STR( Single ) )
	PORT_DIPSETTING(    0x00, "Double" )
	PORT_DIPNAME( 0x80, 0x80, "Link Progressives" )
	PORT_DIPSETTING(    0x80, "Standalone" )
	PORT_DIPSETTING(    0x00, "Link" )
INPUT_PORTS_END


/*************************
*     Machine Driver     *
*************************/

static MACHINE_CONFIG_START( splus, splus_state )   // basic machine hardware
	MCFG_CPU_ADD("maincpu", I80C32, CPU_CLOCK)
	MCFG_CPU_PROGRAM_MAP(splus_map)
	MCFG_CPU_IO_MAP(splus_iomap)

	// Fill NVRAM
	MCFG_NVRAM_ADD_0FILL("cmosl")
	MCFG_NVRAM_ADD_0FILL("cmosh")

	// video hardware (ALL FAKE, NO VIDEO)
	MCFG_PALETTE_ADD("palette", 16*16)
	MCFG_SCREEN_ADD("scrn", RASTER)
	MCFG_SCREEN_REFRESH_RATE(60)
	MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(0))
	MCFG_SCREEN_UPDATE_DRIVER(splus_state, screen_update)
	MCFG_SCREEN_SIZE((52+1)*8, (31+1)*8)
	MCFG_SCREEN_VISIBLE_AREA(0*8, 40*8-1, 0*8, 25*8-1)
	MCFG_SCREEN_PALETTE("palette")

	MCFG_X2404P_ADD("i2cmem")

	// sound hardware
	MCFG_SPEAKER_STANDARD_MONO("mono")

	MCFG_SOUND_ADD("aysnd", AY8912, SOUND_CLOCK)
	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.75)
MACHINE_CONFIG_END

/*************************
*        Rom Load        *
*************************/

ROM_START( spss4240 ) /* Coral Reef (SS4240) */
	ROM_REGION( 0x10000, "maincpu", 0 )
	ROM_LOAD( "sp1271.u52",   0x00000, 0x10000, CRC(dc164599) SHA1(7114652a733b26cd711dbe4d65dde065ba73619f) )

	ROM_REGION( 0x02000, "reeldata", 0 )
	ROM_LOAD( "ss4240.u53",   0x00000, 0x02000, CRC(c5715b9b) SHA1(8b0ca15b520a5c8e1ebec13e3a1dc304fb40aea0) )
ROM_END

/*************************
*      Game Drivers      *
*************************/

/*     YEAR  NAME        PARENT  MACHINE  INPUT   INIT     ROT    COMPANY                                  FULLNAME                       FLAGS             LAYOUT  */
GAMEL( 1994, spss4240,   0,      splus,   splus, splus_state,  splus,   ROT0,  "IGT - International Game Technology", "S-Plus (SS4240) Coral Reef",  MACHINE_NOT_WORKING, layout_splus )