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path: root/src/mame/drivers/cms.cpp
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// license:BSD-3-Clause
// copyright-holders:Nigel Barnes
// thanks-to:Phill Harvey-Smith
/***************************************************************************

    CMS 6502 Development System

    This is an industrial 6502 system in a rack chassis consisting of a
    back-plane and plug-in cards, with two 3.5" floppy disk drives, a
    "SIMON" System Monitor, DFS, and an extended version of BBC BASIC
    called MULTI-BASIC. It has an IBM-XT style keyboard.

    The "Eurocard" standard format cards are as follows:
    - 6502 2nd Processor For The BBC Micro (CMS0026 6502)
    - 40/80 Terminal Card (also handles the keyboard) (CMS 0010-3)
    - High Performance Colour Graphics Card (CMS Video-4)
    - Versatile Interface Board (CMS0006 Issue 4)
    - Analogue Digital Interface Board (CMS00092 A/D I/O)
    - Floppy Disk Controller

****************************************************************************/

#include "emu.h"
#include "cpu/m6502/m6502.h"
#include "machine/6522via.h"
#include "machine/input_merger.h"
#include "bus/acorn/bus.h"
#include "coreutil.h"


class cms_state : public driver_device
{
public:
	cms_state(const machine_config &mconfig, device_type type, const char *tag)
		: driver_device(mconfig, type, tag)
		, m_maincpu(*this, "maincpu")
		, m_rom(*this, "rom")
		, m_bank1(*this, "bank1")
		, m_via(*this, "via")
		, m_irqs(*this, "irqs")
		, m_bus(*this, "bus")
		, m_map_select(0)
		, m_page_select(0)
	{ }

	//DECLARE_INPUT_CHANGED_MEMBER(trigger_reset);

	void cms6502(machine_config &config);

protected:
	virtual void machine_start() override;
	virtual void machine_reset() override;

private:
	DECLARE_WRITE8_MEMBER(map_select_w);
	DECLARE_WRITE8_MEMBER(page_select_w);
	DECLARE_WRITE_LINE_MEMBER(bus_nmi_w);
	DECLARE_READ8_MEMBER(cms_rtc_r);
	DECLARE_WRITE8_MEMBER(cms_rtc_w);

	void cms_rtc_set_time();

	required_device<cpu_device> m_maincpu;
	required_memory_region m_rom;
	required_memory_bank m_bank1;
	required_device<via6522_device> m_via;
	required_device<input_merger_device> m_irqs;
	required_device<acorn_bus_device> m_bus;

	void cms_bank(address_map &map);
	void cms6502_mem(address_map &map);

	uint8_t m_map_select;
	uint8_t m_page_select;

	uint8_t m_rtc_data[0x10];
	int m_rtc_reg;
	int m_rtc_state;

	void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) override;
	emu_timer* m_rtc_timer;

	enum
	{
		TIMER_RTC
	};
};


void cms_state::cms6502_mem(address_map &map)
{
	map.unmap_value_high();
	map(0x0000, 0x7fff).ram();  /* socket M1 43256C-12 32K RAM */
	map(0x8000, 0xbfff).bankr("bank1").w(FUNC(cms_state::page_select_w));
	map(0xc000, 0xffff).rom().region("mos", 0);
	map(0xfc00, 0xfc0f).m(m_via, FUNC(via6522_device::map));
	map(0xfc30, 0xfc3f).rw(FUNC(cms_state::cms_rtc_r), FUNC(cms_state::cms_rtc_w));
	map(0xfc70, 0xfc7f).w(FUNC(cms_state::map_select_w));
}


WRITE8_MEMBER(cms_state::map_select_w)
{
	m_map_select = (data & 0x03) << 2;
	logerror("map select %02x\n", data);
	//if (m_map_select == 0x00)
	//  m_bank1->set_entry(m_page_select);
	//else
		m_bank1->set_entry(m_map_select);
}

WRITE8_MEMBER(cms_state::page_select_w)
{
	logerror("page select %02x\n", data);
	m_page_select = data & 0x03;
	if (m_map_select == 0x00)
	{
		m_page_select = data & 0x03;
		m_bank1->set_entry(m_page_select);
	}
}


/* Input ports */
static INPUT_PORTS_START( cms )
INPUT_PORTS_END


void cms_state::machine_start()
{
	m_bank1->configure_entries(0, 16, m_rom->base(), 0x4000);

	memset(&m_rtc_data, 0, sizeof(m_rtc_data));
	m_rtc_reg = 0;
	m_rtc_state = 0;
	m_rtc_data[0xf] = 1;

	m_rtc_timer = timer_alloc();
	m_rtc_timer->adjust(attotime::zero, 0, attotime(1, 0));
}


void cms_state::machine_reset()
{
	m_bank1->set_entry(0);
}

/* Real Time Clock and NVRAM  EM M3002

reg 0: seconds
reg 1: minutes
reg 2: hours
reg 3: day 1 based
reg 4: month 1 based
reg 5: year
reg 6: week day
reg 7: week number
reg ..
reg 15: status

*/

void cms_state::cms_rtc_set_time()
{
	system_time systime;

	/* get the current date/time from the core */
	machine().current_datetime(systime);

	m_rtc_data[0] = dec_2_bcd(systime.utc_time.second);
	m_rtc_data[1] = dec_2_bcd(systime.utc_time.minute);
	m_rtc_data[2] = dec_2_bcd(systime.utc_time.hour);

	m_rtc_data[3] = dec_2_bcd(systime.utc_time.mday);
	m_rtc_data[4] = dec_2_bcd(systime.utc_time.month + 1);
	m_rtc_data[5] = dec_2_bcd(systime.utc_time.year % 100);
}

void cms_state::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
{
	int month, year;

	switch (id)
	{
	case TIMER_RTC:
		m_rtc_data[0] = bcd_adjust(m_rtc_data[0] + 1);
		if (m_rtc_data[0] >= 0x60)
		{
			m_rtc_data[0] = 0;
			m_rtc_data[1] = bcd_adjust(m_rtc_data[1] + 1);
			if (m_rtc_data[1] >= 0x60)
			{
				m_rtc_data[1] = 0;
				m_rtc_data[2] = bcd_adjust(m_rtc_data[2] + 1);
				if (m_rtc_data[2] >= 0x24)
				{
					m_rtc_data[2] = 0;
					m_rtc_data[3] = bcd_adjust(m_rtc_data[3] + 1);
					month = bcd_2_dec(m_rtc_data[4]);
					year = bcd_2_dec(m_rtc_data[5]) + 2000; // save for julian_days_in_month_calculation
					if (m_rtc_data[3]> gregorian_days_in_month(month, year))
					{
						m_rtc_data[3] = 1;
						m_rtc_data[4] = bcd_adjust(m_rtc_data[4] + 1);
						if (m_rtc_data[4]>0x12)
						{
							m_rtc_data[4] = 1;
							m_rtc_data[5] = bcd_adjust(m_rtc_data[5] + 1) & 0xff;
						}
					}
				}
			}
		}
		break;
	}
}

READ8_MEMBER(cms_state::cms_rtc_r)
{
	int data = 0;

	switch (m_rtc_state)
	{
	case 1:
		data = (m_rtc_data[m_rtc_reg] & 0xf0) >> 4;
		m_rtc_state++;
		break;
	case 2:
		data = m_rtc_data[m_rtc_reg] & 0xf;
		m_rtc_state = 0;
		break;
	}
	return data;
}

WRITE8_MEMBER(cms_state::cms_rtc_w)
{
	switch (m_rtc_state)
	{
	case 0:
		m_rtc_reg = data;
		m_rtc_state = 1;
		break;
	case 1:
		m_rtc_data[m_rtc_reg] = (m_rtc_data[m_rtc_reg] & ~0xf0) | ((data & 0xf) << 4);
		m_rtc_state++;
		break;
	case 2:
		m_rtc_data[m_rtc_reg] = (m_rtc_data[m_rtc_reg] & ~0xf) | (data & 0xf);
		m_rtc_state = 0;
		break;
	}
}


WRITE_LINE_MEMBER(cms_state::bus_nmi_w)
{
	m_maincpu->set_input_line(INPUT_LINE_NMI, state);
}


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

void cms_state::cms6502(machine_config &config)
{
	M6502(config, m_maincpu, 1_MHz_XTAL);
	m_maincpu->set_addrmap(AS_PROGRAM, &cms_state::cms6502_mem);

	INPUT_MERGER_ANY_HIGH(config, m_irqs).output_handler().set_inputline(m_maincpu, M6502_IRQ_LINE);

	VIA6522(config, m_via, 1_MHz_XTAL);
	//m_via->cb2_handler().set(FUNC(cms_state::cass_w));
	m_via->irq_handler().set("irqs", FUNC(input_merger_device::in_w<0>));

	/* 7 Slot Backplane */
	ACORN_BUS(config, m_bus, 0);
	m_bus->set_space(m_maincpu, AS_PROGRAM);
	m_bus->out_irq_callback().set(m_irqs, FUNC(input_merger_device::in_w<1>));
	m_bus->out_nmi_callback().set(FUNC(cms_state::bus_nmi_w));
	ACORN_BUS_SLOT(config, "bus1", m_bus, cms_bus_devices, "4080term");
	ACORN_BUS_SLOT(config, "bus2", m_bus, cms_bus_devices, nullptr);
	ACORN_BUS_SLOT(config, "bus3", m_bus, cms_bus_devices, "fdc");
	ACORN_BUS_SLOT(config, "bus4", m_bus, cms_bus_devices, "hires");
	ACORN_BUS_SLOT(config, "bus5", m_bus, cms_bus_devices, nullptr);
	ACORN_BUS_SLOT(config, "bus6", m_bus, cms_bus_devices, nullptr);
}


/***************************************************************************
    ROM definitions
***************************************************************************/

ROM_START( cms6502 )
	ROM_REGION(0x04000, "mos", 0) /* 27128 */
	ROM_LOAD("6502 system os.m5", 0x0000, 0x4000, CRC(1b6da63d) SHA1(5c0afc55288ad86e1d6e653dda9c5dcccdaf0ff2))

	ROM_REGION(0x40000, "rom", 0)
	/* Socket M4 27513 */
	ROM_LOAD("basic.m4",       0x00000, 0x4000, CRC(e27b6146) SHA1(ae89ee695bed6f49402f009ded16ad3a36f64c28))
	ROM_LOAD("dfs-1.4.m4",     0x04000, 0x4000, CRC(0743ddb5) SHA1(cd61956a10510a6954cba9ba17f70c2991e81d9b))
	ROM_LOAD("simon-2.02.m4",  0x08000, 0x4000, CRC(d1f1b633) SHA1(991c3691a70f45fff3c828c8c0a0906b9f5e34fc))
	ROM_LOAD("multi-basic.m4", 0x0c000, 0x4000, CRC(fb785563) SHA1(9f97582ba0b82f314008bf95eacb00e7bced3cac))
	/* Socket M3 empty */
	/* Socket M2 27128 */
	ROM_LOAD("gdp.m2",         0x20000, 0x4000, CRC(f545293b) SHA1(532c45ac4661643c6c6f633d504ef72e800cc900))
	/* Socket M1 contains RAM, not mapped as ROM */

	ROM_REGION(0x200, "proms", 0)
	ROM_LOAD("bassys2.ic8", 0x0000, 0x0200, CRC(417ff0b4) SHA1(878718accb83f18456fefaf67a0e4a6a407113e4)) // 512x8
ROM_END


/* Driver */

/*    YEAR  NAME     PARENT  COMPAT  MACHINE  INPUT  CLASS      INIT        COMPANY                             FULLNAME                       FLAGS */
COMP( 1986, cms6502, 0,      0,      cms6502, cms,   cms_state, empty_init, "Cambridge Microprocessor Systems", "CMS 6502 Development System", MACHINE_NOT_WORKING | MACHINE_NO_SOUND_HW )