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// license:BSD-3-Clause
// copyright-holders:Miodrag Milanovic, Jonathan Gevaryahu, AJR
/***************************************************************************

        DEC VT100 keyboard emulation

        All data to and from the keyboard is transmitted over a single
        bidirectional wire. The clock that runs the keyboard's UART and
        scan counters is multiplexed with the serial data signal.

        MS7002 is a Soviet clone of the VT100 keyboard. It features a
        bit-paired JCUKEN layout and Russian/Latin mode select keys, but
        the codes it produces are mostly the same, as is the electrical
        interface.

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

#include "emu.h"
#include "machine/vt100_kbd.h"

#include "logmacro.h"


//**************************************************************************
//  VT100 KEYBOARD DEVICE
//**************************************************************************

DEFINE_DEVICE_TYPE(VT100_KEYBOARD, vt100_keyboard_device, "vt100_kbd", "VT100 Keyboard")

static INPUT_PORTS_START(vt100_kbd)
	PORT_START("LINE0")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Right") PORT_CODE(KEYCODE_RIGHT)
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Left") PORT_CODE(KEYCODE_LEFT)
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Up") PORT_CODE(KEYCODE_UP)
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Num 7") PORT_CODE(KEYCODE_7_PAD)
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Num 8") PORT_CODE(KEYCODE_8_PAD)
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Num .") PORT_CODE(KEYCODE_DEL_PAD)
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Num 9") PORT_CODE(KEYCODE_9_PAD)

	PORT_START("LINE1")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("PF3") PORT_CODE(KEYCODE_F3)
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("PF4") PORT_CODE(KEYCODE_F4)
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Num Enter") PORT_CODE(KEYCODE_ENTER_PAD)
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Num ,") PORT_CODE(KEYCODE_PLUS_PAD)
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Num 3") PORT_CODE(KEYCODE_3_PAD)

	PORT_START("LINE2")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Down") PORT_CODE(KEYCODE_DOWN)
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("PF1") PORT_CODE(KEYCODE_F1)
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("PF2") PORT_CODE(KEYCODE_F2)
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Num 2") PORT_CODE(KEYCODE_2_PAD)
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Num 5") PORT_CODE(KEYCODE_5_PAD)
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Num 6") PORT_CODE(KEYCODE_6_PAD)

	PORT_START("LINE3")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Delete") PORT_CODE(KEYCODE_DEL)
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Break") PORT_CODE(KEYCODE_F6)
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Backspace") PORT_CODE(KEYCODE_BACKSPACE)
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Num 0") PORT_CODE(KEYCODE_0_PAD)
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Num 1") PORT_CODE(KEYCODE_1_PAD)
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Num 4") PORT_CODE(KEYCODE_4_PAD)
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Num -") PORT_CODE(KEYCODE_MINUS_PAD)

	PORT_START("LINE4")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Num Return") PORT_CODE(KEYCODE_ENTER_PAD)
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("]") PORT_CODE(KEYCODE_CLOSEBRACE)
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("~") PORT_CODE(KEYCODE_TILDE)
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("=") PORT_CODE(KEYCODE_EQUALS)
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Line feed") PORT_CODE(KEYCODE_RALT)
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Return") PORT_CODE(KEYCODE_ENTER)
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_UNUSED)

	PORT_START("LINE5")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("P") PORT_CODE(KEYCODE_P)
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("[") PORT_CODE(KEYCODE_OPENBRACE)
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("-") PORT_CODE(KEYCODE_MINUS)
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("0") PORT_CODE(KEYCODE_0)
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\\") PORT_CODE(KEYCODE_BACKSLASH)
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("'") PORT_CODE(KEYCODE_QUOTE)
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME(".") PORT_CODE(KEYCODE_STOP)
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("/") PORT_CODE(KEYCODE_SLASH)

	PORT_START("LINE6")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("O") PORT_CODE(KEYCODE_O)
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("I") PORT_CODE(KEYCODE_I)
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("9") PORT_CODE(KEYCODE_9)
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("8") PORT_CODE(KEYCODE_8)
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("L") PORT_CODE(KEYCODE_L)
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME(";") PORT_CODE(KEYCODE_COLON)
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME(",") PORT_CODE(KEYCODE_COMMA)
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("M") PORT_CODE(KEYCODE_M)

	PORT_START("LINE7")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Y") PORT_CODE(KEYCODE_Y)
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("U") PORT_CODE(KEYCODE_U)
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("7") PORT_CODE(KEYCODE_7)
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("6") PORT_CODE(KEYCODE_6)
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("K") PORT_CODE(KEYCODE_K)
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("J") PORT_CODE(KEYCODE_J)
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("N") PORT_CODE(KEYCODE_N)
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Space") PORT_CODE(KEYCODE_SPACE)

	PORT_START("LINE8")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("T") PORT_CODE(KEYCODE_T)
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("R") PORT_CODE(KEYCODE_R)
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("4") PORT_CODE(KEYCODE_4)
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("5") PORT_CODE(KEYCODE_5)
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("G") PORT_CODE(KEYCODE_G)
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("H") PORT_CODE(KEYCODE_H)
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("B") PORT_CODE(KEYCODE_B)
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("V") PORT_CODE(KEYCODE_V)

	PORT_START("LINE9")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("W") PORT_CODE(KEYCODE_W)
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("E") PORT_CODE(KEYCODE_E)
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("3") PORT_CODE(KEYCODE_3)
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("2") PORT_CODE(KEYCODE_2)
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("F") PORT_CODE(KEYCODE_F)
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("D") PORT_CODE(KEYCODE_D)
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("X") PORT_CODE(KEYCODE_X)
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("C") PORT_CODE(KEYCODE_C)

	PORT_START("LINEA")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Q") PORT_CODE(KEYCODE_Q)
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("1") PORT_CODE(KEYCODE_1)
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Esc") PORT_CODE(KEYCODE_ESC)
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Tab") PORT_CODE(KEYCODE_TAB)
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("A") PORT_CODE(KEYCODE_A)
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("S") PORT_CODE(KEYCODE_S)
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("No scroll") PORT_CODE(KEYCODE_LALT)
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Z") PORT_CODE(KEYCODE_Z)

	PORT_START("LINEB")
	PORT_BIT(0x7F, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Setup") PORT_CODE(KEYCODE_F5)

	PORT_START("LINEC")
	PORT_BIT(0x7F, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Ctrl") PORT_CODE(KEYCODE_LCONTROL) PORT_CODE(KEYCODE_RCONTROL)

	PORT_START("LINED")
	PORT_BIT(0x7F, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Shift") PORT_CODE(KEYCODE_LSHIFT) PORT_CODE(KEYCODE_RSHIFT)

	PORT_START("LINEE")
	PORT_BIT(0x7F, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Caps lock") PORT_CODE(KEYCODE_CAPSLOCK)

	PORT_START("LINEF")
	PORT_BIT(0x7F, IP_ACTIVE_LOW,  IPT_UNUSED)
	PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_UNUSED) // Always return 0x7f on last scan line
INPUT_PORTS_END


//-------------------------------------------------
//  vt100_keyboard_device - constructor
//-------------------------------------------------

vt100_keyboard_device::vt100_keyboard_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock)
	: vt100_keyboard_device(mconfig, VT100_KEYBOARD, tag, owner, clock)
{
}

vt100_keyboard_device::vt100_keyboard_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, u32 clock)
	: device_t(mconfig, type, tag, owner, clock)
	, m_signal_out_cb(*this)
	, m_uart(*this, "uart")
	, m_speaker(*this, "beeper")
	, m_scan_counter(*this, "counter")
	, m_key_row(*this, "LINE%X", 0)
	, m_online_led(*this, "online_led")
	, m_local_led(*this, "local_led")
	, m_locked_led(*this, "locked_led")
	, m_ln_led(*this, "l%u_led", 1U)
	, m_signal_line(true)
	, m_last_signal_change(attotime::zero)
	, m_last_scan(0)
{
}


//-------------------------------------------------
//  device_add_mconfig - add device configuration
//-------------------------------------------------

MACHINE_CONFIG_START(vt100_keyboard_device::device_add_mconfig)
	SPEAKER(config, "mono").front_center();
	MCFG_DEVICE_ADD("beeper", BEEP, 786) // 7.945us per serial clock = ~125865.324hz, / 160 clocks per char = ~ 786 hz
	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.50)

	MCFG_DEVICE_ADD("uart", AY31015, 0)
	MCFG_AY31015_WRITE_SO_CB(WRITELINE(*this, vt100_keyboard_device, signal_out_w))

	MCFG_DEVICE_ADD("counter", RIPPLE_COUNTER, 0) // 2x 74LS93
	MCFG_RIPPLE_COUNTER_STAGES(8)
	MCFG_RIPPLE_COUNTER_COUNT_OUT_CB(WRITE8(*this, vt100_keyboard_device, key_scan_w))
MACHINE_CONFIG_END


//-------------------------------------------------
//  input_ports - device-specific input ports
//-------------------------------------------------

ioport_constructor vt100_keyboard_device::device_input_ports() const
{
	return INPUT_PORTS_NAME(vt100_kbd);
}


//-------------------------------------------------
//  device_resolve_objects - resolve objects that
//  may be needed for other devices to set
//  initial conditions at start time
//-------------------------------------------------

void vt100_keyboard_device::device_resolve_objects()
{
	m_signal_out_cb.resolve_safe();
}


//-------------------------------------------------
//  device_start - device-specific startup
//-------------------------------------------------

void vt100_keyboard_device::device_start()
{
	if (!m_uart->started())
		throw device_missing_dependencies();

	m_uart->write_tsb(0);
	m_uart->write_eps(1);
	m_uart->write_np(1);
	m_uart->write_nb1(1);
	m_uart->write_nb2(1);
	m_uart->write_cs(1);
	m_uart->write_swe(0);

	m_online_led.resolve();
	m_local_led.resolve();
	m_locked_led.resolve();
	m_ln_led.resolve();

	m_online_led = 0;
	m_local_led = 1;
	m_locked_led = 1;
	for (int n = 0; n < 4; n++)
		m_ln_led[n] = 1;

	save_item(NAME(m_signal_line));
	save_item(NAME(m_last_signal_change));
	save_item(NAME(m_last_scan));
}


//-------------------------------------------------
//  signal_line_w - handle external serial input
//-------------------------------------------------

WRITE_LINE_MEMBER(vt100_keyboard_device::signal_line_w)
{
	if (m_signal_line == bool(state))
		return;

	if (machine().time() > m_last_signal_change + attotime::from_usec(5))
		m_uart->write_si(m_signal_line);

	if (scan_enabled())
		m_scan_counter->clock_w(state);

	if (state)
	{
		bool dav = m_uart->dav_r();
		m_uart->write_rdav(!dav);

		if (dav)
		{
			u8 data = m_uart->get_received_data();
			m_online_led = BIT(data, 5) ? 1 : 0;
			m_local_led = BIT(data, 5) ? 0 : 1;
			m_locked_led = BIT(data, 4) ? 0 : 1;
			for (int n = 0; n < 4; n++)
				m_ln_led[n] = BIT(data, 3 - n) ? 0 : 1;
			m_speaker->set_state(BIT(data, 7));

			if (BIT(data, 6))
			{
				m_scan_counter->reset_w(0);
				scan_start();
			}
		}
	}

	m_uart->write_rcp(state);
	m_uart->write_tcp(state);

	m_signal_line = bool(state);
	m_last_signal_change = machine().time();
}


//-------------------------------------------------
//  signal_out_w - transmit serial keyboard output
//-------------------------------------------------

WRITE_LINE_MEMBER(vt100_keyboard_device::signal_out_w)
{
	m_signal_out_cb(state);
}


//-------------------------------------------------
//  key_scan_w - handle scan counter outputs
//-------------------------------------------------

WRITE8_MEMBER(vt100_keyboard_device::key_scan_w)
{
	if (BIT(data, 0))
	{
		u8 input_row = m_key_row[(data >> 1) & 15]->read();
		if (!BIT(input_row, (data >> 5) & 7))
		{
			if (data != 0xff)
				LOG("Keycode pressed: %02X\n", (data >> 1) & 0x7f);
			m_uart->set_transmit_data((data >> 1) & 0x7f);
		}
	}

	if (!BIT(data, 7) && BIT(m_last_scan, 7))
	{
		m_last_scan = 0;
		m_scan_counter->reset_w(1);
	}
	else
		m_last_scan = data;
}


//**************************************************************************
//  MS7002 KEYBOARD DEVICE
//**************************************************************************

DEFINE_DEVICE_TYPE(MS7002, ms7002_device, "ms7002", "MS7002 Keyboard")

static INPUT_PORTS_START(ms7002)
	PORT_START("LINE0")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_RIGHT) PORT_CHAR(UCHAR_MAMEKEY(RIGHT))
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_LEFT) PORT_CHAR(UCHAR_MAMEKEY(LEFT))
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_UP) PORT_CHAR(UCHAR_MAMEKEY(UP))
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_7_PAD) PORT_CHAR(UCHAR_MAMEKEY(7_PAD))
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_8_PAD) PORT_CHAR(UCHAR_MAMEKEY(8_PAD))
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_DEL_PAD) PORT_CHAR(UCHAR_MAMEKEY(DEL_PAD))
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_9_PAD) PORT_CHAR(UCHAR_MAMEKEY(9_PAD))

	PORT_START("LINE1")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\xd0\x9f\xd0\xa4" "3") PORT_CODE(KEYCODE_F3)
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\xd0\x9f\xd0\xa4" "4") PORT_CODE(KEYCODE_F4)
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\xd0\x92\xd0\x92\xd0\x9e\xd0\x94") PORT_CODE(KEYCODE_ENTER_PAD) PORT_CHAR(UCHAR_MAMEKEY(ENTER_PAD))
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_PLUS_PAD) PORT_CHAR(UCHAR_MAMEKEY(COMMA_PAD))
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_3_PAD) PORT_CHAR(UCHAR_MAMEKEY(3_PAD))

	PORT_START("LINE2")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\xd0\x9b\xd0\x90\xd0\xa2") // ЛАТ = латинские
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_DOWN) PORT_CHAR(UCHAR_MAMEKEY(DOWN))
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\xd0\x9f\xd0\xa4" "1") PORT_CODE(KEYCODE_F1)
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\xd0\x9f\xd0\xa4" "2") PORT_CODE(KEYCODE_F2)
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_2_PAD) PORT_CHAR(UCHAR_MAMEKEY(2_PAD))
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_5_PAD) PORT_CHAR(UCHAR_MAMEKEY(5_PAD))
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_6_PAD) PORT_CHAR(UCHAR_MAMEKEY(6_PAD))

	PORT_START("LINE3")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_TILDE) PORT_CHAR('_') // note that this does NOT double as Ъ
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\xd0\x97\xd0\x91") PORT_CODE(KEYCODE_DEL) // ЗБ = забой
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\xd0\x9f\xd0\xa0\xd0\x92") PORT_CODE(KEYCODE_F6) // ПРВ = перерыв
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\xd0\x92\xd0\xa8") PORT_CODE(KEYCODE_BACKSPACE) PORT_CHAR(0x08) // ВШ = возврат на шаг
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_0_PAD) PORT_CHAR(UCHAR_MAMEKEY(0_PAD))
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_1_PAD) PORT_CHAR(UCHAR_MAMEKEY(1_PAD))
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_4_PAD) PORT_CHAR(UCHAR_MAMEKEY(4_PAD))
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_MINUS_PAD) PORT_CHAR(UCHAR_MAMEKEY(MINUS_PAD))

	PORT_START("LINE4")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\xd0\x92\xd0\x9a") PORT_CODE(KEYCODE_ENTER) PORT_CHAR(0x0d) // ВК = возврат каретки
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\xd0\xa9 ]") PORT_CODE(KEYCODE_O) PORT_CHAR('}') PORT_CHAR(']')
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\xd0\xa7 \xc2\xac") PORT_CODE(KEYCODE_X) PORT_CHAR(0x203e, '~') PORT_CHAR(0xac, '^')
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_1) PORT_CHAR(';') PORT_CHAR('+')
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_EQUALS) PORT_CHAR('-') PORT_CHAR('=')
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_MINUS) PORT_CHAR('0')
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\xd0\x9f\xd0\xa1") PORT_CODE(KEYCODE_RSHIFT) PORT_CHAR(0x0a) // ПС = перевод строки
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_UNUSED)

	PORT_START("LINE5")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\xd0\x9f P") PORT_CODE(KEYCODE_G) PORT_CHAR('p') PORT_CHAR('P') PORT_CHAR(0x10)
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\xd0\xa8 [") PORT_CODE(KEYCODE_I) PORT_CHAR('{') PORT_CHAR('[')
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_CLOSEBRACE) PORT_CHAR(':') PORT_CHAR('*')
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\xd0\xa0\xd0\xa3\xd0\xa1") // РУС = русские
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\xd0\xad \\") PORT_CODE(KEYCODE_QUOTE) PORT_CHAR('|') PORT_CHAR('\\')
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_UNUSED) // possibly Keypad 9
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_SLASH) PORT_CHAR('.') PORT_CHAR('>')
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_BACKSLASH) PORT_CHAR('/') PORT_CHAR('?')

	PORT_START("LINE6")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\xd0\x9e O") PORT_CODE(KEYCODE_J) PORT_CHAR('o') PORT_CHAR('O') PORT_CHAR(0x0f)
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\xd0\x98 I") PORT_CODE(KEYCODE_B) PORT_CHAR('i') PORT_CHAR('I')
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_0) PORT_CHAR('9') PORT_CHAR(')')
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_9) PORT_CHAR('8') PORT_CHAR('(')
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\xd0\x9b L") PORT_CODE(KEYCODE_K) PORT_CHAR('l') PORT_CHAR('L') PORT_CHAR(0x0c)
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\xd0\xae @") PORT_CODE(KEYCODE_STOP) PORT_CHAR('`') PORT_CHAR('@')
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_RALT) PORT_CHAR(',') PORT_CHAR('<')
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\xd0\x9c M") PORT_CODE(KEYCODE_V) PORT_CHAR('m') PORT_CHAR('M')

	PORT_START("LINE7")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\xd0\xab Y") PORT_CODE(KEYCODE_S) PORT_CHAR('y') PORT_CHAR('Y') PORT_CHAR(0x19)
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\xd0\xa3 U") PORT_CODE(KEYCODE_E) PORT_CHAR('u') PORT_CHAR('U') PORT_CHAR(0x15)
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_8) PORT_CHAR('7') PORT_CHAR('\'')
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_7) PORT_CHAR('6') PORT_CHAR('&')
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\xd0\x9a K") PORT_CODE(KEYCODE_R) PORT_CHAR('k') PORT_CHAR('K') PORT_CHAR(0x0b)
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\xd0\x99 J") PORT_CODE(KEYCODE_Q) PORT_CHAR('j') PORT_CHAR('J')
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\xd0\x9d N") PORT_CODE(KEYCODE_Y) PORT_CHAR('n') PORT_CHAR('N') PORT_CHAR(0x0e)
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_SPACE) PORT_CHAR(' ')

	PORT_START("LINE8")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\xd0\xa2 T") PORT_CODE(KEYCODE_N) PORT_CHAR('t') PORT_CHAR('T') PORT_CHAR(0x14)
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\xd0\xa0 R") PORT_CODE(KEYCODE_H) PORT_CHAR('r') PORT_CHAR('R') PORT_CHAR(0x12)
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("4 \xc2\xa4") PORT_CODE(KEYCODE_5) PORT_CHAR('4') PORT_CHAR(0xa4, '$')
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_6) PORT_CHAR('5') PORT_CHAR('%')
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\xd0\x93 G") PORT_CODE(KEYCODE_U) PORT_CHAR('g') PORT_CHAR('G') PORT_CHAR(0x07)
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\xd0\xa5 H") PORT_CODE(KEYCODE_OPENBRACE) PORT_CHAR('h') PORT_CHAR('H')
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\xd0\x91 B") PORT_CODE(KEYCODE_COMMA) PORT_CHAR('b') PORT_CHAR('B') PORT_CHAR(0x02)
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\xd0\x96 V") PORT_CODE(KEYCODE_COLON) PORT_CHAR('v') PORT_CHAR('V') PORT_CHAR(0x16)

	PORT_START("LINE9")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\xd0\x92 W") PORT_CODE(KEYCODE_D) PORT_CHAR('w') PORT_CHAR('W') PORT_CHAR(0x17)
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\xd0\x95 E") PORT_CODE(KEYCODE_T) PORT_CHAR('e') PORT_CHAR('E') PORT_CHAR(0x05)
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_4) PORT_CHAR('3') PORT_CHAR('#')
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_3) PORT_CHAR('2') PORT_CHAR('"')
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\xd0\xa4 F") PORT_CODE(KEYCODE_A) PORT_CHAR('f') PORT_CHAR('F') PORT_CHAR(0x06)
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\xd0\x94 D") PORT_CODE(KEYCODE_L) PORT_CHAR('d') PORT_CHAR('D') PORT_CHAR(0x04)
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\xd0\xac X") PORT_CODE(KEYCODE_M) PORT_CHAR('x') PORT_CHAR('X') PORT_CHAR(0x18)
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\xd0\xa6 C") PORT_CODE(KEYCODE_W) PORT_CHAR('c') PORT_CHAR('C') PORT_CHAR(0x03)

	PORT_START("LINEA")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\xd0\xaf Q") PORT_CODE(KEYCODE_Z) PORT_CHAR('q') PORT_CHAR('Q') PORT_CHAR(0x11)
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_2) PORT_CHAR('1') PORT_CHAR('!')
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\xd0\x90\xd0\xa0" "2") PORT_CODE(KEYCODE_ESC) PORT_CHAR(0x1b) // АР2 = авторегистр 2
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\xd0\xa2\xd0\x90\xd0\x91") PORT_CODE(KEYCODE_TAB) PORT_CHAR(0x09) // ТАБ = табуляция
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\xd0\x90 A") PORT_CODE(KEYCODE_F) PORT_CHAR('a') PORT_CHAR('A') PORT_CHAR(0x01)
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\xd0\xa1 S") PORT_CODE(KEYCODE_C) PORT_CHAR('s') PORT_CHAR('S') PORT_CHAR(0x13)
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\xd0\xa1\xd0\xa2\xd0\x9e\xd0\x9f") PORT_CODE(KEYCODE_LALT) // СТОП
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\xd0\x97 Z") PORT_CODE(KEYCODE_P) PORT_CHAR('z') PORT_CHAR('Z') PORT_CHAR(0x1a)

	PORT_START("LINEB")
	PORT_BIT(0x7F, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\xd0\xa3\xd0\xa1\xd0\xa2") PORT_CODE(KEYCODE_F5) PORT_CHAR(UCHAR_MAMEKEY(F1) ) // УСТ = установка

	PORT_START("LINEC")
	PORT_BIT(0x7F, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\xd0\xa3\xd0\x9f\xd0\xa0") PORT_CODE(KEYCODE_LCONTROL) PORT_CHAR(UCHAR_SHIFT_2) // УПР = управляющий

	PORT_START("LINED")
	PORT_BIT(0x7F, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\xd0\x92\xd0\xa0") PORT_CODE(KEYCODE_LSHIFT) PORT_CHAR(UCHAR_SHIFT_1) // ВР = верхний регистр

	PORT_START("LINEE")
	PORT_BIT(0x7F, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_CAPSLOCK) PORT_CHAR(UCHAR_MAMEKEY(CAPSLOCK)) // maybe

	PORT_START("LINEF")
	PORT_BIT(0x7F, IP_ACTIVE_LOW,  IPT_UNUSED)
	PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_UNUSED) // Always return 0x7f on last scan line
INPUT_PORTS_END


//-------------------------------------------------
//  ms7002_device - constructor
//-------------------------------------------------

ms7002_device::ms7002_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock)
	: vt100_keyboard_device(mconfig, MS7002, tag, owner, clock)
	, m_scan_enable(false)
{
}


//-------------------------------------------------
//  device_add_mconfig - add device configuration
//-------------------------------------------------

MACHINE_CONFIG_START(ms7002_device::device_add_mconfig)
	vt100_keyboard_device::device_add_mconfig(config);

	MCFG_DEVICE_MODIFY("uart")
	MCFG_AY31015_WRITE_TBMT_CB(WRITELINE(*this, ms7002_device, scan_disable_w))
MACHINE_CONFIG_END


//-------------------------------------------------
//  input_ports - device-specific input ports
//-------------------------------------------------

ioport_constructor ms7002_device::device_input_ports() const
{
	return INPUT_PORTS_NAME(ms7002);
}


//-------------------------------------------------
//  device_start - device-specific startup
//-------------------------------------------------

void ms7002_device::device_start()
{
	vt100_keyboard_device::device_start();

	save_item(NAME(m_scan_enable));
}


//-------------------------------------------------
//  scan_disable_w - suspend scan count once
//  keycode is being transmitted
//-------------------------------------------------

WRITE_LINE_MEMBER(ms7002_device::scan_disable_w)
{
	if (!state)
		m_scan_enable = false;
}