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// license:BSD-3-Clause
// copyright-holders:Miodrag Milanovic
/***************************************************************************

        Elektronika MK-90

        12/05/2009 Skeleton driver.


    http://www.pisi.com.pl/piotr433/index.htm#mk90
    http://www.taswegian.com/MOSCOW/mk-90.html

This is a Soviet computer-calculator, very similar in looks to the Sharp.
It has a LCD display. It cost about 1500 roubles, which is the wages for 6
months for an average citizen.

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

#include "emu.h"
#include "cpu/t11/t11.h"
#include "emupal.h"
#include "screen.h"


class mk90_state : public driver_device
{
public:
	mk90_state(const machine_config &mconfig, device_type type, const char *tag)
		: driver_device(mconfig, type, tag) ,
		m_maincpu(*this, "maincpu") { }

	void mk90(machine_config &config);

private:
	virtual void machine_reset() override;
	virtual void video_start() override;
	uint32_t screen_update_mk90(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
	required_device<cpu_device> m_maincpu;
	void mk90_mem(address_map &map);
};


void mk90_state::mk90_mem(address_map &map)
{
	map.unmap_value_high();
	map(0x0000, 0x3fff).ram(); // RAM
	map(0x4000, 0x7fff).rom(); // Extension ROM
	map(0x8000, 0xffff).rom(); // Main ROM
//  AM_RANGE(0xe800, 0xe801) LCD address
//  AM_RANGE(0xe802, 0xe803) LCD data
//  AM_RANGE(0xe810, 0xe810) serial bus controller data
//  AM_RANGE(0xe812, 0xe813) serial bus controller transfer rate
//  AM_RANGE(0xe814, 0xe814) serial bus controller control/status
//  AM_RANGE(0xe816, 0xe816) serial bus controller command
//  AM_RANGE(0xea00, 0xea7e) RTC
}

/* Input ports */
static INPUT_PORTS_START( mk90 )
INPUT_PORTS_END


void mk90_state::machine_reset()
{
}

void mk90_state::video_start()
{
}

uint32_t mk90_state::screen_update_mk90(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
	return 0;
}

MACHINE_CONFIG_START(mk90_state::mk90)
	/* basic machine hardware */
	MCFG_DEVICE_ADD("maincpu", K1801VM2, XTAL(4'000'000))
	MCFG_T11_INITIAL_MODE(0x8000)
	MCFG_DEVICE_PROGRAM_MAP(mk90_mem)


	/* video hardware */
	MCFG_SCREEN_ADD("screen", RASTER)
	MCFG_SCREEN_REFRESH_RATE(50)
	MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500)) /* not accurate */
	MCFG_SCREEN_SIZE(640, 480)
	MCFG_SCREEN_VISIBLE_AREA(0, 640-1, 0, 480-1)
	MCFG_SCREEN_UPDATE_DRIVER(mk90_state, screen_update_mk90)
	MCFG_SCREEN_PALETTE("palette")

	MCFG_PALETTE_ADD_MONOCHROME("palette")
MACHINE_CONFIG_END

/* ROM definition */
ROM_START( mk90 )
	ROM_REGION( 0x10000, "maincpu", ROMREGION_ERASEFF )
	ROM_SYSTEM_BIOS(0, "bas1", "Basic 1")
	ROMX_LOAD( "mk90ro10.bin",  0x8000, 0x8000, CRC(fac18038) SHA1(639f09a1be5f781f897603d0f799f7c6efd1b67f), ROM_BIOS(0))

	ROM_SYSTEM_BIOS(1, "bas2", "Basic 2")
	ROMX_LOAD( "mk90ro20.bin",  0x8000, 0x8000, CRC(d8b3a5f5) SHA1(8f7ab2d97c7466392b6354c0ea7017531c2133ae), ROM_BIOS(1))
	ROMX_LOAD( "mk90ro20t.bin", 0x4000, 0x4000, CRC(0f4b9434) SHA1(c74bbde6d201913c9e67ef8e2abe14b784187f8d), ROM_BIOS(1))  // Expansion ROM
ROM_END

/* Driver */

/*    YEAR  NAME  PARENT  COMPAT  MACHINE  INPUT  CLASS       INIT        COMPANY        FULLNAME  FLAGS */
COMP( 1988, mk90, 0,      0,      mk90,    mk90,  mk90_state, empty_init, "Elektronika", "MK-90",  MACHINE_NOT_WORKING | MACHINE_NO_SOUND)