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// license:BSD-3-Clause
// copyright-holders:Curt Coder
/*

    Nokia Elektroniikka pj

    Controller ILC 9534
    FDC-Interface ILC 9530

    Parts:

    6,144 MHz xtal (CPU clock)
    18,720 MHz xtal (pixel clock)
    16 MHz xtal (FDC clock)
    Intel I8085AP (CPU)
    Intel 8253-5P (PIT)
    Intel 8275P (CRTC)
    Intel 8212P (I/OP)
    Intel 8237A-5P (DMAC)
    NEC uPD7220C (GDC)
    NEC uPD7201P (MPSC=uart)
    NEC uPD765 (FDC)
    TMS4116-15 (16Kx4 DRAM)*4 = 32KB Video RAM for 7220
    2164-6P (64Kx1 DRAM)*8 = 64KB Work RAM

    DMA channels:

    0   CRT
    1   MPSC transmit
    2   MPSC receive
    3   FDC

    Interrupts:

    INTR    MPSC INT
    RST5.5  FDC IRQ
    RST6.5  8212 INT
    RST7.5  DMA EOP

*/

/*

    TODO:

    - NEC uPD7220 GDC
    - accurate video timing
    - floppy DRQ during RECALL = 0
    - PCB layout
    - NEC uPD7201 MPSC
    - model M7 5MB hard disk

*/

#include "emu.h"
#include "includes/mikromik.h"
#include "machine/74259.h"
#include "softlist.h"

//#define VERBOSE 1
#include "logmacro.h"


//**************************************************************************
//  MACROS / CONSTANTS
//**************************************************************************

#define MMU_IOEN    0x01
#define MMU_RAMEN   0x02
#define MMU_CE4     0x08
#define MMU_CE0     0x10
#define MMU_CE1     0x20
#define MMU_CE2     0x40
#define MMU_CE3     0x80



//**************************************************************************
//  MEMORY MANAGEMENT UNIT
//**************************************************************************

//-------------------------------------------------
//  read -
//-------------------------------------------------

uint8_t mm1_state::read(offs_t offset)
{
	uint8_t data = 0;
	uint8_t mmu = m_mmu_rom->base()[(m_a8 << 8) | (offset >> 8)];

	if (mmu & MMU_IOEN)
	{
		data = m_io->read8(offset & 0x7f);
	}
	else
	{
		if (mmu & MMU_RAMEN)
		{
			data = m_ram->pointer()[offset];
		}
		else if (!(mmu & MMU_CE0))
		{
			data = m_rom->base()[offset & 0x1fff];
		}
		else if (!(mmu & MMU_CE1))
		{
			data = m_rom->base()[0x2000 + (offset & 0x1fff)];
		}
	}

	return data;
}



//-------------------------------------------------
//  write -
//-------------------------------------------------

void mm1_state::write(offs_t offset, uint8_t data)
{
	uint8_t mmu = m_mmu_rom->base()[(m_a8 << 8) | (offset >> 8)];

	if (mmu & MMU_IOEN)
	{
		m_io->write8(offset & 0x7f, data);
	}
	else
	{
		if (mmu & MMU_RAMEN)
		{
			m_ram->pointer()[offset] = data;
		}
	}
}


//-------------------------------------------------
//  a8_w -
//-------------------------------------------------

WRITE_LINE_MEMBER( mm1_state::a8_w )
{
	LOG("IC24 A8 %u\n", state);
	m_a8 = state;
}


//-------------------------------------------------
//  recall_w -
//-------------------------------------------------

WRITE_LINE_MEMBER( mm1_state::recall_w )
{
	LOG("RECALL %u\n", state);
	m_recall = state;
	if (state) m_fdc->soft_reset();
}


//-------------------------------------------------
//  rx21_w -
//-------------------------------------------------

WRITE_LINE_MEMBER( mm1_state::rx21_w )
{
	m_rx21 = state;
}


//-------------------------------------------------
//  tx21_w -
//-------------------------------------------------

WRITE_LINE_MEMBER( mm1_state::tx21_w )
{
	m_tx21 = state;
}


//-------------------------------------------------
//  rcl_w -
//-------------------------------------------------

WRITE_LINE_MEMBER( mm1_state::rcl_w )
{
	m_rcl = state;
}


//-------------------------------------------------
//  intc_w -
//-------------------------------------------------

WRITE_LINE_MEMBER( mm1_state::intc_w )
{
	m_intc = state;
}


//-------------------------------------------------
//  llen_w -
//-------------------------------------------------

WRITE_LINE_MEMBER( mm1_state::llen_w )
{
	LOG("LLEN %u\n", state);
	m_llen = state;
}


//-------------------------------------------------
//  motor_on_w -
//-------------------------------------------------

WRITE_LINE_MEMBER( mm1_state::motor_on_w )
{
	LOG("MOTOR %u\n", state);
	m_floppy0->mon_w(!state);
	m_floppy1->mon_w(!state);
}



//**************************************************************************
//  ADDRESS MAPS
//**************************************************************************

//-------------------------------------------------
//  ADDRESS_MAP( mm1_map )
//-------------------------------------------------

void mm1_state::mm1_map(address_map &map)
{
	map(0x0000, 0xffff).rw(FUNC(mm1_state::read), FUNC(mm1_state::write));
}

void mm1_state::mmu_io_map(address_map &map)
{
	map(0x00, 0x0f).rw(m_dmac, FUNC(am9517a_device::read), FUNC(am9517a_device::write));
	map(0x10, 0x13).mirror(0x0c).rw(m_mpsc, FUNC(upd7201_device::cd_ba_r), FUNC(upd7201_device::cd_ba_w));
	map(0x20, 0x21).mirror(0x0e).rw(m_crtc, FUNC(i8275_device::read), FUNC(i8275_device::write));
	map(0x30, 0x33).mirror(0x0c).rw(m_pit, FUNC(pit8253_device::read), FUNC(pit8253_device::write));
	map(0x40, 0x40).mirror(0x0f).rw(m_iop, FUNC(i8212_device::read), FUNC(i8212_device::write));
	map(0x50, 0x51).mirror(0x0e).m(m_fdc, FUNC(upd765a_device::map));
	map(0x60, 0x67).mirror(0x08).w("outlatch", FUNC(ls259_device::write_d0));
	map(0x70, 0x71).mirror(0x0e).rw(m_hgdc, FUNC(upd7220_device::read), FUNC(upd7220_device::write));
}



//**************************************************************************
//  INPUT PORTS
//**************************************************************************

//-------------------------------------------------
//  INPUT_PORTS( mm1 )
//-------------------------------------------------

static INPUT_PORTS_START( mm1 )
	// defined in machine/mm1kb.h

	PORT_START("T5")
	PORT_CONFNAME( 0x01, 0x00, "Floppy Drive Type")
	PORT_CONFSETTING( 0x00, "640 KB" )
	PORT_CONFSETTING( 0x01, "160/320 KB" )
INPUT_PORTS_END



//**************************************************************************
//  DEVICE CONFIGURATION
//**************************************************************************

//-------------------------------------------------
//  I8237_INTERFACE( dmac_intf )
//-------------------------------------------------

void mm1_state::update_tc()
{
	int fdc_tc = m_tc && !m_dack3;

	if (m_fdc_tc != fdc_tc)
	{
		m_fdc_tc = fdc_tc;
		m_fdc->tc_w(m_fdc_tc);
	}
}

WRITE_LINE_MEMBER( mm1_state::dma_hrq_w )
{
	m_maincpu->set_input_line(INPUT_LINE_HALT, state ? ASSERT_LINE : CLEAR_LINE);

	// Assert HLDA
	m_dmac->hack_w(state);
}

uint8_t mm1_state::mpsc_dack_r()
{
	// clear data request
	m_dmac->dreq2_w(CLEAR_LINE);

	return 1;//m_mpsc->dtra_r();
}

void mm1_state::mpsc_dack_w(uint8_t data)
{
	//m_mpsc->hai_w(data);

	// clear data request
	m_dmac->dreq1_w(CLEAR_LINE);
}

WRITE_LINE_MEMBER( mm1_state::dma_eop_w )
{
	m_maincpu->set_input_line(I8085_RST75_LINE, state);

	m_tc = state;
	update_tc();
}

WRITE_LINE_MEMBER( mm1_state::dack3_w )
{
	m_dack3 = state;
	update_tc();
}

WRITE_LINE_MEMBER( mm1_state::itxc_w )
{
	if (!m_intc)
	{
		m_mpsc->txca_w(state);
	}
}

WRITE_LINE_MEMBER( mm1_state::irxc_w )
{
	if (!m_intc)
	{
		m_mpsc->rxca_w(state);
	}
}

WRITE_LINE_MEMBER( mm1_state::auxc_w )
{
	m_mpsc->txcb_w(state);
	m_mpsc->rxcb_w(state);
}

//-------------------------------------------------
//  UPD7201
//-------------------------------------------------

WRITE_LINE_MEMBER( mm1_state::drq2_w )
{
	if (state)
	{
		m_dmac->dreq2_w(ASSERT_LINE);
	}
}

WRITE_LINE_MEMBER( mm1_state::drq1_w )
{
	if (state)
	{
		m_dmac->dreq1_w(ASSERT_LINE);
	}
}

READ_LINE_MEMBER( mm1_state::dsra_r )
{
	return 1;
}


//-------------------------------------------------
//  upd765_interface fdc_intf
//-------------------------------------------------

FLOPPY_FORMATS_MEMBER( mm1_state::floppy_formats )
	FLOPPY_MM1_FORMAT
FLOPPY_FORMATS_END
/*
FLOPPY_FORMATS_MEMBER( mm2_state::floppy_formats )
    FLOPPY_MM2_FORMAT
FLOPPY_FORMATS_END
*/
static void mm1_floppies(device_slot_interface &device)
{
	device.option_add("525qd", FLOPPY_525_QD);
}


//**************************************************************************
//  MACHINE INITIALIZATION
//**************************************************************************

//-------------------------------------------------
//  MACHINE_START( mm1 )
//-------------------------------------------------

void mm1_state::machine_start()
{
	// register for state saving
	save_item(NAME(m_llen));
	save_item(NAME(m_intc));
	save_item(NAME(m_rx21));
	save_item(NAME(m_tx21));
	save_item(NAME(m_rcl));
	save_item(NAME(m_recall));
}


void mm1_state::machine_reset()
{
	// reset FDC
	m_fdc->reset();
}



//**************************************************************************
//  MACHINE DRIVERS
//**************************************************************************

//-------------------------------------------------
//  machine_config( mm1 )
//-------------------------------------------------

void mm1_state::mm1(machine_config &config)
{
	// basic system hardware
	I8085A(config, m_maincpu, 6.144_MHz_XTAL);
	m_maincpu->set_addrmap(AS_PROGRAM, &mm1_state::mm1_map);
	m_maincpu->in_sid_func().set(FUNC(mm1_state::dsra_r));
	m_maincpu->out_sod_func().set(KB_TAG, FUNC(mm1_keyboard_device::bell_w));

	config.set_perfect_quantum(m_maincpu);

	// peripheral hardware
	ADDRESS_MAP_BANK(config, m_io);
	m_io->set_addrmap(0, &mm1_state::mmu_io_map);
	m_io->set_data_width(8);
	m_io->set_addr_width(7);

	I8212(config, m_iop, 0);
	m_iop->int_wr_callback().set_inputline(m_maincpu, I8085_RST65_LINE);
	m_iop->di_rd_callback().set(KB_TAG, FUNC(mm1_keyboard_device::read));

	ls259_device &outlatch(LS259(config, "outlatch"));
	outlatch.q_out_cb<0>().set(FUNC(mm1_state::a8_w)); // IC24 A8
	outlatch.q_out_cb<1>().set(FUNC(mm1_state::recall_w)); // RECALL
	outlatch.q_out_cb<2>().set(FUNC(mm1_state::rx21_w)); // _RV28/RX21
	outlatch.q_out_cb<3>().set(FUNC(mm1_state::tx21_w)); // _TX21
	outlatch.q_out_cb<4>().set(FUNC(mm1_state::rcl_w)); // _RCL
	outlatch.q_out_cb<5>().set(FUNC(mm1_state::intc_w)); // _INTC
	outlatch.q_out_cb<6>().set(FUNC(mm1_state::llen_w)); // LLEN
	outlatch.q_out_cb<7>().set(FUNC(mm1_state::motor_on_w)); // MOTOR ON

	AM9517A(config, m_dmac, 6.144_MHz_XTAL/2);
	m_dmac->out_hreq_callback().set(FUNC(mm1_state::dma_hrq_w));
	m_dmac->out_eop_callback().set(FUNC(mm1_state::dma_eop_w));
	m_dmac->in_memr_callback().set(FUNC(mm1_state::read));
	m_dmac->out_memw_callback().set(FUNC(mm1_state::write));
	m_dmac->in_ior_callback<2>().set(FUNC(mm1_state::mpsc_dack_r));
	m_dmac->in_ior_callback<3>().set(m_fdc, FUNC(upd765_family_device::dma_r));
	m_dmac->out_iow_callback<0>().set(m_crtc, FUNC(i8275_device::dack_w));
	m_dmac->out_iow_callback<1>().set(FUNC(mm1_state::mpsc_dack_w));
	m_dmac->out_iow_callback<3>().set(m_fdc, FUNC(upd765_family_device::dma_w));
	m_dmac->out_dack_callback<3>().set(FUNC(mm1_state::dack3_w));

	PIT8253(config, m_pit, 0);
	m_pit->set_clk<0>(6.144_MHz_XTAL/2/2);
	m_pit->out_handler<0>().set(FUNC(mm1_state::itxc_w));
	m_pit->set_clk<1>(6.144_MHz_XTAL/2/2);
	m_pit->out_handler<1>().set(FUNC(mm1_state::irxc_w));
	m_pit->set_clk<2>(6.144_MHz_XTAL/2/2);
	m_pit->out_handler<2>().set(FUNC(mm1_state::auxc_w));

	UPD765A(config, m_fdc, 16_MHz_XTAL/2, true, true);
	m_fdc->intrq_wr_callback().set_inputline(m_maincpu, I8085_RST55_LINE);
	m_fdc->drq_wr_callback().set(m_dmac, FUNC(am9517a_device::dreq3_w));
	FLOPPY_CONNECTOR(config, UPD765_TAG ":0", mm1_floppies, "525qd", mm1_state::floppy_formats).enable_sound(true);
	FLOPPY_CONNECTOR(config, UPD765_TAG ":1", mm1_floppies, "525qd", mm1_state::floppy_formats).enable_sound(true);

	UPD7201(config, m_mpsc, 6.144_MHz_XTAL/2);
	m_mpsc->out_txda_callback().set(m_rs232a, FUNC(rs232_port_device::write_txd));
	m_mpsc->out_dtra_callback().set(m_rs232a, FUNC(rs232_port_device::write_dtr));
	m_mpsc->out_rtsa_callback().set(m_rs232a, FUNC(rs232_port_device::write_rts));
	m_mpsc->out_rxdrqa_callback().set(FUNC(mm1_state::drq2_w));
	m_mpsc->out_txdrqa_callback().set(FUNC(mm1_state::drq1_w));

	RS232_PORT(config, m_rs232a, default_rs232_devices, nullptr);
	m_rs232a->cts_handler().set(m_mpsc, FUNC(upd7201_device::rxa_w));
	RS232_PORT(config, m_rs232b, default_rs232_devices, nullptr);
	RS232_PORT(config, m_rs232c, default_rs232_devices, nullptr);
	m_rs232c->cts_handler().set(m_mpsc, FUNC(upd7201_device::ctsb_w));

	mm1_keyboard_device &kb(MM1_KEYBOARD(config, KB_TAG, 2500)); // actual KBCLK is 6.144_MHz_XTAL/2/16
	kb.kbst_wr_callback().set(m_iop, FUNC(i8212_device::stb_w));

	// internal ram
	RAM(config, RAM_TAG).set_default_size("64K");

	// software lists
	SOFTWARE_LIST(config, "flop_list").set_original("mm1_flop");
}


//-------------------------------------------------
//  machine_config( mm1m6 )
//-------------------------------------------------

void mm1_state::mm1m6(machine_config &config)
{
	mm1(config);
	// video hardware
	mm1m6_video(config);
}


//-------------------------------------------------
//  machine_config( mm1m7 )
//-------------------------------------------------

void mm1_state::mm1m7(machine_config &config)
{
	mm1(config);
	// video hardware
	mm1m6_video(config);

	// TODO hard disk
}



//**************************************************************************
//  ROMS
//**************************************************************************

//-------------------------------------------------
//  ROM( mm1m6 )
//-------------------------------------------------

ROM_START( mm1m6 )
	ROM_REGION( 0x4000, I8085A_TAG, 0 ) // BIOS
	ROM_LOAD( "9081b.ic2", 0x0000, 0x2000, CRC(2955feb3) SHA1(946a6b0b8fb898be3f480c04da33d7aaa781152b) )

	ROM_REGION( 0x200, "address", 0 ) // address decoder
	ROM_LOAD( "720793a.ic24", 0x0000, 0x0200, CRC(deea87a6) SHA1(8f19e43252c9a0b1befd02fc9d34fe1437477f3a) )

	ROM_REGION( 0x1000, "chargen", 0 ) // character generator
	ROM_LOAD( "6807b.ic61", 0x0000, 0x1000, CRC(32b36220) SHA1(8fe7a181badea3f7e656dfaea21ee9e4c9baf0f1) )
ROM_END


//-------------------------------------------------
//  ROM( mm1m7 )
//-------------------------------------------------

#define rom_mm1m7 rom_mm1m6



//**************************************************************************
//  SYSTEM DRIVERS
//**************************************************************************

//    YEAR  NAME   PARENT  COMPAT  MACHINE  INPUT  CLASS      INIT        COMPANY       FULLNAME           FLAGS
COMP( 1981, mm1m6, 0,      0,      mm1m6,   mm1,   mm1_state, empty_init, "Nokia Data", "MikroMikko 1 M6", MACHINE_SUPPORTS_SAVE )
COMP( 1981, mm1m7, mm1m6,  0,      mm1m7,   mm1,   mm1_state, empty_init, "Nokia Data", "MikroMikko 1 M7", MACHINE_SUPPORTS_SAVE )