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// license:MAME
// copyright-holders:Robbbert
/******************************************************************************
*
*    EA Car Computer
*        by Robbbert, March 2011.
*
*    Described in Electronics Australia magazine during 1982.
*    Construction and usage: http://messui.the-chronicles.org/comp/eacc.pdf
*
*    The only RAM is the 128 bytes that comes inside the CPU.
*
*    This computer is mounted in a car, and various sensors (fuel flow, etc)
*    are connected up. By pressing the appropriate buttons various statistics
*    may be obtained.
*
*    Memory Map
*    0000-007F internal ram
*    4000-7FFF ROM
*    8000-BFFF 6821
*    C000-FFFF ROM (mirror)
*
*    The ROM was typed in twice from the dump in the magazine article, and the
*    results compared. Only one byte was different, so I can be confident that
*    it has been typed in properly.
*
*    Setting up: You need to enter the number of expected pulses from the fuel
*    and distance sensors. Paste this: 5 6M123N 7M400N  (start, set litres cal to
*    123 pulses. set km cal to 400 pulses). Then paste this: 1950M0N 1845M0N (set
*    petrol tank capacity to 50 litres, set current amount of petrol to 45).
*    Now enter: 28M100N (the journey is 100km). Press 5 to start the journey.
*    All settings are saved in nvram.
*
*    Stats you can see while travelling:
*    0  - time elapsed
*    08 - time remaining
*    1  - fuel used
*    18 - fuel left
*    2  - km travelled
*    28 - km remaining
*    29 - km that could be travelled with the fuel you have left
*    3  - speed now
*    39 - average speed
*    4  - fuel consumption now (litres per 100km)
*    49 - fuel average consumption
*
******************************************************************************/

/* Core includes */
#include "emu.h"
#include "cpu/m6800/m6800.h"
#include "eacc.lh"
#include "machine/6821pia.h"
#include "machine/nvram.h"


class eacc_state : public driver_device
{
public:
	eacc_state(const machine_config &mconfig, device_type type, const char *tag)
		: driver_device(mconfig, type, tag),
	m_maincpu(*this, "maincpu"),
	m_pia(*this, "pia"),
	m_p_nvram(*this, "nvram")
	{ }

	DECLARE_READ_LINE_MEMBER( eacc_cb1_r );
	DECLARE_READ_LINE_MEMBER( eacc_distance_r );
	DECLARE_READ_LINE_MEMBER( eacc_fuel_sensor_r );
	DECLARE_READ8_MEMBER( eacc_keyboard_r );
	DECLARE_WRITE_LINE_MEMBER( eacc_cb2_w );
	DECLARE_WRITE8_MEMBER( eacc_digit_w );
	DECLARE_WRITE8_MEMBER( eacc_segment_w );
	bool m_cb1;
	bool m_cb2;
	bool m_nmi;
	required_device<cpu_device> m_maincpu;
	required_device<pia6821_device> m_pia;
	required_shared_ptr<UINT8> m_p_nvram;
	virtual void machine_reset();
	TIMER_DEVICE_CALLBACK_MEMBER(eacc_cb1);
	TIMER_DEVICE_CALLBACK_MEMBER(eacc_nmi);
private:
	UINT8 m_digit;
};




/******************************************************************************
 Address Maps
******************************************************************************/

static ADDRESS_MAP_START(eacc_mem, AS_PROGRAM, 8, eacc_state)
	ADDRESS_MAP_UNMAP_HIGH
	ADDRESS_MAP_GLOBAL_MASK(0xc7ff) // A11,A12,A13 not connected
	AM_RANGE(0x0000, 0x001f) AM_RAM AM_SHARE("nvram") // inside cpu, battery-backed
	AM_RANGE(0x0020, 0x007f) AM_RAM // inside cpu
	AM_RANGE(0x6000, 0x67ff) AM_ROM AM_MIRROR(0x8000)
	AM_RANGE(0x8004, 0x8007) AM_MIRROR(0x7fc) AM_DEVREADWRITE("pia", pia6821_device, read, write)
ADDRESS_MAP_END


/******************************************************************************
 Input Ports
******************************************************************************/

static INPUT_PORTS_START(eacc)
	PORT_START("X0")
	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_NAME("6 Litres Cal") PORT_CODE(KEYCODE_6_PAD) PORT_CHAR('6')
	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_NAME("ENTER") PORT_CODE(KEYCODE_ENTER_PAD) PORT_CHAR('M')
	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_NAME("2 km") PORT_CODE(KEYCODE_2_PAD) PORT_CHAR('2')
	PORT_BIT( 0xf8, 0, IPT_UNUSED )

	PORT_START("X1")
	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_NAME("5 START") PORT_CODE(KEYCODE_5_PAD) PORT_CHAR('5')
	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_NAME("END") PORT_CODE(KEYCODE_PLUS_PAD) PORT_CHAR('N')
	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_NAME("3 km/h") PORT_CODE(KEYCODE_3_PAD) PORT_CHAR('3')
	PORT_BIT( 0xf8, 0, IPT_UNUSED )

	PORT_START("X2")
	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_NAME("7 Km Cal") PORT_CODE(KEYCODE_7_PAD) PORT_CHAR('7')
	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_NAME("0 hour.min") PORT_CODE(KEYCODE_0_PAD) PORT_CHAR('0')
	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_NAME("4 l/100km") PORT_CODE(KEYCODE_4_PAD) PORT_CHAR('4')
	PORT_BIT( 0xf8, 0, IPT_UNUSED )

	PORT_START("X3")
	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_NAME("8 REM") PORT_CODE(KEYCODE_8_PAD) PORT_CHAR('8')
	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_NAME("1 litres") PORT_CODE(KEYCODE_1_PAD) PORT_CHAR('1')
	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_NAME("9 AV") PORT_CODE(KEYCODE_9_PAD) PORT_CHAR('9')
	PORT_BIT( 0xf8, 0, IPT_UNUSED )
INPUT_PORTS_END

void eacc_state::machine_reset()
{
	m_cb2 = 0;
}

TIMER_DEVICE_CALLBACK_MEMBER(eacc_state::eacc_cb1)
{
	m_cb1 ^= 1; // 15hz
	if (m_cb2)
		m_maincpu->set_input_line(M6800_IRQ_LINE, ASSERT_LINE);
}

TIMER_DEVICE_CALLBACK_MEMBER(eacc_state::eacc_nmi)
{
	if (m_cb2)
	{
		m_nmi = true;
		m_maincpu->set_input_line(INPUT_LINE_NMI, ASSERT_LINE);
	}
}

READ_LINE_MEMBER( eacc_state::eacc_cb1_r )
{
	return (m_cb2) ? m_cb1 : 1;
}

READ_LINE_MEMBER( eacc_state::eacc_distance_r )
{
	return machine().rand() & 1; // needs random pulses to simulate movement
}

READ_LINE_MEMBER( eacc_state::eacc_fuel_sensor_r )
{
	return machine().rand() & 1; // needs random pulses to simulate fuel usage
}

WRITE_LINE_MEMBER( eacc_state::eacc_cb2_w )
{
	m_cb2 = state;
}

READ8_MEMBER( eacc_state::eacc_keyboard_r )
{
	UINT8 data = m_digit;

	if (BIT(m_digit, 3))
		data |= ioport("X0")->read();
	if (BIT(m_digit, 4))
		data |= ioport("X1")->read();
	if (BIT(m_digit, 5))
		data |= ioport("X2")->read();
	if (BIT(m_digit, 6))
		data |= ioport("X3")->read();

	return data;
}

WRITE8_MEMBER( eacc_state::eacc_segment_w )
{
	//d7 segment dot
	//d6 segment c
	//d5 segment d
	//d4 segment e
	//d3 segment a
	//d2 segment b
	//d1 segment f
	//d0 segment g

	if (!m_nmi)
	{
		UINT8 i;
		if (BIT(m_digit, 7))
		{
			char lednum[6];
			data ^= 0xff;

			for (i = 0; i < 8; i++)
			{
				sprintf(lednum,"led%d",i);
				output_set_value(lednum, BIT(data, i));
			}
		}
		else
		{
			for (i = 3; i < 7; i++)
				if (BIT(m_digit, i))
					output_set_digit_value(i, BITSWAP8(data, 7, 0, 1, 4, 5, 6, 2, 3));
		}
	}
}

WRITE8_MEMBER( eacc_state::eacc_digit_w )
{
	if (m_nmi)
	{
		m_maincpu->set_input_line(INPUT_LINE_NMI, CLEAR_LINE);
		m_nmi = false;
	}
	m_digit = data & 0xf8;
}


/******************************************************************************
 Machine Drivers
******************************************************************************/

static MACHINE_CONFIG_START( eacc, eacc_state )
	/* basic machine hardware */
	MCFG_CPU_ADD("maincpu", M6802, XTAL_3_579545MHz)  /* Divided by 4 inside the m6802*/
	MCFG_CPU_PROGRAM_MAP(eacc_mem)

	MCFG_DEFAULT_LAYOUT(layout_eacc)

	MCFG_DEVICE_ADD("pia", PIA6821, 0)
	MCFG_PIA_READPB_HANDLER(READ8(eacc_state, eacc_keyboard_r))
	MCFG_PIA_READCA1_HANDLER(READLINE(eacc_state, eacc_distance_r))
	MCFG_PIA_READCB1_HANDLER(READLINE(eacc_state, eacc_cb1_r))
	MCFG_PIA_READCA2_HANDLER(READLINE(eacc_state, eacc_fuel_sensor_r))
	MCFG_PIA_WRITEPA_HANDLER(WRITE8(eacc_state, eacc_segment_w))
	MCFG_PIA_WRITEPB_HANDLER(WRITE8(eacc_state, eacc_digit_w))
	MCFG_PIA_CB2_HANDLER(WRITELINE(eacc_state, eacc_cb2_w))
	MCFG_PIA_IRQA_HANDLER(DEVWRITELINE("maincpu", m6802_cpu_device, irq_line))
	MCFG_PIA_IRQB_HANDLER(DEVWRITELINE("maincpu", m6802_cpu_device, irq_line))

	MCFG_NVRAM_ADD_0FILL("nvram")
	MCFG_TIMER_DRIVER_ADD_PERIODIC("eacc_nmi", eacc_state, eacc_nmi, attotime::from_hz(600))
	MCFG_TIMER_DRIVER_ADD_PERIODIC("eacc_cb1", eacc_state, eacc_cb1, attotime::from_hz(30))
MACHINE_CONFIG_END



/******************************************************************************
 ROM Definitions
******************************************************************************/

ROM_START(eacc)
	ROM_REGION(0x10000, "maincpu", 0)
	ROM_LOAD("eacc.bin", 0x4000, 0x0800, CRC(287a63c0) SHA1(f61b397d33ea40e5742e34d5f5468572125e8b39) )
ROM_END


/******************************************************************************
 Drivers
******************************************************************************/

/*    YEAR  NAME        PARENT      COMPAT  MACHINE     INPUT   INIT      COMPANY                     FULLNAME        FLAGS */
COMP( 1982, eacc,       0,          0,      eacc,       eacc, driver_device,   0,     "Electronics Australia", "EA Car Computer", GAME_NO_SOUND_HW)