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// license:BSD-3-Clause
// copyright-holders:Robbbert, Mark Garlanger
/***************************************************************************

    Heathkit H19

    A smart terminal designed and manufactured by Heath Company.

    The keyboard consists of a 9x10 matrix connected to a MM5740AAC/N
    mask-programmed keyboard controller. The output of this passes
    through a rom.

    Input can also come from the serial port (a 8250).
    Either device will signal an interrupt to the CPU when a key
    is pressed/data is received.

    TODO:
    - speed up emulation
    - update SW401 baud rate options for Watz ROM
    - update SW401 & SW402 definitions for Super-19 ROM
    - update SW401 & SW402 definitions for ULTRA ROM
    - add option for ULTRA ROMs second page of screen RAM

****************************************************************************/
/***************************************************************************
 Memory Layout
   The U435 three-to-eight line decoder uses A14 and A15 to generate three memory addresses:

   1.   Program ROM        0x0000

   2.   Scratchpad RAM     0x4000

   3.   Display Memory     0xF800


 Port Layout

   Only address lines A5, A6, A7 are used by the U442 three-to-eight line decoder

Address   Description
----------------------------------------------------
 0x00   Power-up configuration (primary - SW401)
 0x20   Power-up configuration (secondary - SW402)
 0x40   ACE (communications)
 0x60   CRT controller
 0x80   Keyboard encoder
 0xA0   Keyboard status
 0xC0   Key click enable
 0xE0   Bell enable

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

#include "emu.h"
#include "cpu/z80/z80.h"
#include "machine/ins8250.h"
#include "machine/mm5740.h"
#include "sound/beep.h"
#include "video/mc6845.h"
#include "screen.h"
#include "speaker.h"


// Standard H19 used a 2.048 MHz clock
#define H19_CLOCK (XTAL(12'288'000) / 6)
#define MC6845_CLOCK (XTAL(12'288'000) /8)
#define INS8250_CLOCK (XTAL(12'288'000) /4)

// Capacitor value in pF
#define H19_KEY_DEBOUNCE_CAPACITOR 5000
#define MM5740_CLOCK (mm5740_device::calc_effective_clock_key_debounce(H19_KEY_DEBOUNCE_CAPACITOR))

// Beep Frequency is 1 KHz
#define H19_BEEP_FRQ (H19_CLOCK / 2048)

#define KBDC_TAG    "mm5740"

class h19_state : public driver_device
{
public:
	enum
	{
		TIMER_KEY_CLICK_OFF,
		TIMER_BELL_OFF
	};

	h19_state(const machine_config &mconfig, device_type type, const char *tag)
		: driver_device(mconfig, type, tag)
		, m_palette(*this, "palette")
		, m_maincpu(*this, "maincpu")
		, m_crtc(*this, "crtc")
		, m_ace(*this, "ins8250")
		, m_beep(*this, "beeper")
		, m_p_videoram(*this, "videoram")
		, m_p_chargen(*this, "chargen")
		, m_mm5740(*this, KBDC_TAG)
		, m_kbdrom(*this, "keyboard")
		, m_kbspecial(*this, "MODIFIERS")
	{
	}

	DECLARE_WRITE8_MEMBER(h19_keyclick_w);
	DECLARE_WRITE8_MEMBER(h19_bell_w);
	DECLARE_READ8_MEMBER(kbd_key_r);
	DECLARE_READ8_MEMBER(kbd_flags_r);
	DECLARE_READ_LINE_MEMBER(mm5740_shift_r);
	DECLARE_READ_LINE_MEMBER(mm5740_control_r);
	DECLARE_WRITE_LINE_MEMBER(mm5740_data_ready_w);

	MC6845_UPDATE_ROW(crtc_update_row);

	void h19(machine_config &config);
	void io_map(address_map &map);
	void mem_map(address_map &map);
private:
	virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) override;
	virtual void machine_reset() override;

	required_device<palette_device> m_palette;
	required_device<cpu_device>     m_maincpu;
	required_device<mc6845_device>  m_crtc;
	required_device<ins8250_device> m_ace;
	required_device<beep_device>    m_beep;
	required_shared_ptr<uint8_t>    m_p_videoram;
	required_region_ptr<u8>         m_p_chargen;
	required_device<mm5740_device>  m_mm5740;
	required_memory_region          m_kbdrom;
	required_ioport                 m_kbspecial;

	uint8_t  m_transchar;
	bool     m_strobe;
	bool     m_keyclickactive;
	bool     m_bellactive;

	uint16_t translate_mm5740_b(uint16_t b);
};

void h19_state::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
{
	switch (id)
	{
	case TIMER_KEY_CLICK_OFF:
		m_keyclickactive = false;
		break;
	case TIMER_BELL_OFF:
		m_bellactive = false;
		break;
	default:
		assert_always(false, "Unknown id in h19_state::device_timer");
	}

	if (!m_keyclickactive && !m_bellactive)
	{
		m_beep->set_state(0);
	}
}



void h19_state::mem_map(address_map &map)
{
	map.unmap_value_high();
	map(0x0000, 0x1fff).mirror(0x2000).rom();
	map(0x4000, 0x4100).mirror(0x3e00).ram();
	map(0xc000, 0xc7ff).mirror(0x3800).ram().share("videoram");
}

void h19_state::io_map(address_map &map)
{
	map.unmap_value_high();
	map.global_mask(0xff);
	map(0x00, 0x00).mirror(0x1f).portr("SW401");
	map(0x20, 0x20).mirror(0x1f).portr("SW402");
	map(0x40, 0x47).mirror(0x18).rw(m_ace, FUNC(ins8250_device::ins8250_r), FUNC(ins8250_device::ins8250_w));
	map(0x60, 0x60).mirror(0x1E).w(m_crtc, FUNC(mc6845_device::address_w));
	map(0x61, 0x61).mirror(0x1E).rw(m_crtc, FUNC(mc6845_device::register_r), FUNC(mc6845_device::register_w));
	map(0x80, 0x80).mirror(0x1f).r(this, FUNC(h19_state::kbd_key_r));
	map(0xA0, 0xA0).mirror(0x1f).r(this, FUNC(h19_state::kbd_flags_r));
	map(0xC0, 0xC0).mirror(0x1f).w(this, FUNC(h19_state::h19_keyclick_w));
	map(0xE0, 0xE0).mirror(0x1f).w(this, FUNC(h19_state::h19_bell_w));
}

/* Input ports */
static INPUT_PORTS_START( h19 )

	PORT_START("MODIFIERS")
	// bit 0 connects to B8 of MM5740 - low if either shift key is
	// bit 7 is low if a key is pressed
	PORT_BIT(0x002, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("CapsLock")   PORT_CODE(KEYCODE_CAPSLOCK) PORT_TOGGLE
	PORT_BIT(0x004, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Break")      PORT_CODE(KEYCODE_PAUSE)
	PORT_BIT(0x008, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("OffLine")    PORT_CODE(KEYCODE_F12)       PORT_TOGGLE
	PORT_BIT(0x010, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("CTRL")       PORT_CODE(KEYCODE_LCONTROL)  PORT_CHAR(UCHAR_MAMEKEY(LCONTROL))
	PORT_BIT(0x020, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("LeftShift")  PORT_CODE(KEYCODE_LSHIFT)    PORT_CHAR(UCHAR_SHIFT_1)
	PORT_BIT(0x040, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Repeat")     PORT_CODE(KEYCODE_LALT)
	PORT_BIT(0x100, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("RightShift") PORT_CODE(KEYCODE_RSHIFT)    PORT_CHAR(UCHAR_SHIFT_1)
	PORT_BIT(0x200, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Reset")      PORT_CODE(KEYCODE_F10)

	PORT_START("X1")
	PORT_BIT(0x001, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("/")          PORT_CODE(KEYCODE_SLASH)      PORT_CHAR('/') PORT_CHAR('?')
	PORT_BIT(0x002, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Unused")
	PORT_BIT(0x004, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Unused")
	PORT_BIT(0x008, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Unused")
	PORT_BIT(0x010, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("k_X2")
	PORT_BIT(0x020, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Unused")
	PORT_BIT(0x040, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("0-pad")      PORT_CODE(KEYCODE_0_PAD)      PORT_CHAR('0')
	PORT_BIT(0x080, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Dot-pad")    PORT_CODE(KEYCODE_DEL_PAD)    PORT_CHAR('.')
	PORT_BIT(0x100, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Enter-pad")  PORT_CODE(KEYCODE_ENTER_PAD)  PORT_CHAR(13)
	PORT_BIT(0x200, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Unused")

	PORT_START("X2")
	PORT_BIT(0x001, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME(";")          PORT_CODE(KEYCODE_COLON)      PORT_CHAR(';') PORT_CHAR('.')
	PORT_BIT(0x002, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\'")         PORT_CODE(KEYCODE_QUOTE)      PORT_CHAR('\'') PORT_CHAR('\"')
	PORT_BIT(0x004, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("{")          PORT_CODE(KEYCODE_CLOSEBRACE) PORT_CHAR('{') PORT_CHAR('}')
	PORT_BIT(0x008, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Return")     PORT_CODE(KEYCODE_ENTER)      PORT_CHAR(13)
	PORT_BIT(0x010, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Unused")
	PORT_BIT(0x020, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Unused")
	PORT_BIT(0x040, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("1-pad")      PORT_CODE(KEYCODE_1_PAD)      PORT_CHAR('1')
	PORT_BIT(0x080, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("2-pad")      PORT_CODE(KEYCODE_2_PAD)      PORT_CHAR('2')
	PORT_BIT(0x100, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("3-pad")      PORT_CODE(KEYCODE_3_PAD)      PORT_CHAR('3')
	PORT_BIT(0x200, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Unused")

	PORT_START("X3")
	PORT_BIT(0x001, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("P")          PORT_CODE(KEYCODE_P)          PORT_CHAR('p') PORT_CHAR('P')
	PORT_BIT(0x002, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("[")          PORT_CODE(KEYCODE_OPENBRACE)  PORT_CHAR('[') PORT_CHAR(']')
	PORT_BIT(0x004, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\\")         PORT_CODE(KEYCODE_BACKSLASH)  PORT_CHAR('\\') PORT_CHAR('|')
	PORT_BIT(0x008, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("LF")         PORT_CODE(KEYCODE_RWIN)
	PORT_BIT(0x010, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("DEL")        PORT_CODE(KEYCODE_DEL)        PORT_CHAR(UCHAR_MAMEKEY(DEL))
	PORT_BIT(0x020, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Unused")
	PORT_BIT(0x040, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("4-pad")      PORT_CODE(KEYCODE_4_PAD)      PORT_CHAR('4')
	PORT_BIT(0x080, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("5-pad")      PORT_CODE(KEYCODE_5_PAD)      PORT_CHAR('5')
	PORT_BIT(0x100, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("6-pad")      PORT_CODE(KEYCODE_6_PAD)      PORT_CHAR('6')
	PORT_BIT(0x200, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Unused")

	PORT_START("X4")
	PORT_BIT(0x001, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("0")          PORT_CODE(KEYCODE_0)          PORT_CHAR('0') PORT_CHAR(')')
	PORT_BIT(0x002, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("-")          PORT_CODE(KEYCODE_MINUS)      PORT_CHAR('-') PORT_CHAR('_')
	PORT_BIT(0x004, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("=")          PORT_CODE(KEYCODE_EQUALS)     PORT_CHAR('=') PORT_CHAR('+')
	PORT_BIT(0x008, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("AccentAcute") PORT_CODE(KEYCODE_TILDE)     PORT_CHAR('`') PORT_CHAR('~')
	PORT_BIT(0x010, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("BS")         PORT_CODE(KEYCODE_BACKSPACE)  PORT_CHAR(8)
	PORT_BIT(0x020, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("k_X1")
	PORT_BIT(0x040, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("7-pad")      PORT_CODE(KEYCODE_7_PAD)      PORT_CHAR('7')
	PORT_BIT(0x080, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("8-pad")      PORT_CODE(KEYCODE_8_PAD)      PORT_CHAR('8')
	PORT_BIT(0x100, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("9-pad")      PORT_CODE(KEYCODE_9_PAD)      PORT_CHAR('9')
	PORT_BIT(0x200, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Unused")

	PORT_START("X5")
	PORT_BIT(0x001, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("F1")         PORT_CODE(KEYCODE_F1)
	PORT_BIT(0x002, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("F2")         PORT_CODE(KEYCODE_F2)
	PORT_BIT(0x004, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("F3")         PORT_CODE(KEYCODE_F3)
	PORT_BIT(0x008, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("F4")         PORT_CODE(KEYCODE_F4)
	PORT_BIT(0x010, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("F5")         PORT_CODE(KEYCODE_F5)
	PORT_BIT(0x020, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Erase")      PORT_CODE(KEYCODE_F6)
	PORT_BIT(0x040, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Blue")       PORT_CODE(KEYCODE_F7)
	PORT_BIT(0x080, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Red")        PORT_CODE(KEYCODE_F8)
	PORT_BIT(0x100, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Gray")       PORT_CODE(KEYCODE_F9)
	PORT_BIT(0x200, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Unused")

	PORT_START("X6")
	PORT_BIT(0x001, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Z")          PORT_CODE(KEYCODE_Z)          PORT_CHAR('z') PORT_CHAR('Z')
	PORT_BIT(0x002, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("X")          PORT_CODE(KEYCODE_X)          PORT_CHAR('x') PORT_CHAR('X')
	PORT_BIT(0x004, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("C")          PORT_CODE(KEYCODE_C)          PORT_CHAR('c') PORT_CHAR('C')
	PORT_BIT(0x008, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("V")          PORT_CODE(KEYCODE_V)          PORT_CHAR('v') PORT_CHAR('V')
	PORT_BIT(0x010, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("B")          PORT_CODE(KEYCODE_B)          PORT_CHAR('b') PORT_CHAR('B')
	PORT_BIT(0x020, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("N")          PORT_CODE(KEYCODE_N)          PORT_CHAR('n') PORT_CHAR('N')
	PORT_BIT(0x040, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("M")          PORT_CODE(KEYCODE_M)          PORT_CHAR('m') PORT_CHAR('M')
	PORT_BIT(0x080, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME(",")          PORT_CODE(KEYCODE_COMMA)      PORT_CHAR(',') PORT_CHAR('<')
	PORT_BIT(0x100, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME(".")          PORT_CODE(KEYCODE_STOP)       PORT_CHAR('.') PORT_CHAR('>')
	PORT_BIT(0x200, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Space")      PORT_CODE(KEYCODE_SPACE)      PORT_CHAR(' ')

	PORT_START("X7")
	PORT_BIT(0x001, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("A")          PORT_CODE(KEYCODE_A)          PORT_CHAR('a') PORT_CHAR('A')
	PORT_BIT(0x002, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("S")          PORT_CODE(KEYCODE_S)          PORT_CHAR('s') PORT_CHAR('S')
	PORT_BIT(0x004, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("D")          PORT_CODE(KEYCODE_D)          PORT_CHAR('d') PORT_CHAR('D')
	PORT_BIT(0x008, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("F")          PORT_CODE(KEYCODE_F)          PORT_CHAR('f') PORT_CHAR('F')
	PORT_BIT(0x010, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("G")          PORT_CODE(KEYCODE_G)          PORT_CHAR('g') PORT_CHAR('G')
	PORT_BIT(0x020, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("H")          PORT_CODE(KEYCODE_H)          PORT_CHAR('h') PORT_CHAR('H')
	PORT_BIT(0x040, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("J")          PORT_CODE(KEYCODE_J)          PORT_CHAR('j') PORT_CHAR('J')
	PORT_BIT(0x080, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("K")          PORT_CODE(KEYCODE_K)          PORT_CHAR('k') PORT_CHAR('K')
	PORT_BIT(0x100, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("L")          PORT_CODE(KEYCODE_L)          PORT_CHAR('l') PORT_CHAR('L')
	PORT_BIT(0x200, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Scroll")     PORT_CODE(KEYCODE_LWIN)

	PORT_START("X8")
	PORT_BIT(0x001, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Q")          PORT_CODE(KEYCODE_Q)          PORT_CHAR('q') PORT_CHAR('Q')
	PORT_BIT(0x002, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("W")          PORT_CODE(KEYCODE_W)          PORT_CHAR('w') PORT_CHAR('W')
	PORT_BIT(0x004, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("E")          PORT_CODE(KEYCODE_E)          PORT_CHAR('e') PORT_CHAR('E')
	PORT_BIT(0x008, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("R")          PORT_CODE(KEYCODE_R)          PORT_CHAR('r') PORT_CHAR('R')
	PORT_BIT(0x010, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("T")          PORT_CODE(KEYCODE_T)          PORT_CHAR('t') PORT_CHAR('T')
	PORT_BIT(0x020, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Y")          PORT_CODE(KEYCODE_Y)          PORT_CHAR('y') PORT_CHAR('Y')
	PORT_BIT(0x040, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("U")          PORT_CODE(KEYCODE_U)          PORT_CHAR('u') PORT_CHAR('U')
	PORT_BIT(0x080, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("I")          PORT_CODE(KEYCODE_I)          PORT_CHAR('i') PORT_CHAR('I')
	PORT_BIT(0x100, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("O")          PORT_CODE(KEYCODE_O)          PORT_CHAR('o') PORT_CHAR('O')
	PORT_BIT(0x200, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Tab")        PORT_CODE(KEYCODE_TAB)        PORT_CHAR(9)

	PORT_START("X9")
	PORT_BIT(0x001, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("1")          PORT_CODE(KEYCODE_1)          PORT_CHAR('1') PORT_CHAR('!')
	PORT_BIT(0x002, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("2")          PORT_CODE(KEYCODE_2)          PORT_CHAR('2') PORT_CHAR('@')
	PORT_BIT(0x004, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("3")          PORT_CODE(KEYCODE_3)          PORT_CHAR('3') PORT_CHAR('#')
	PORT_BIT(0x008, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("4")          PORT_CODE(KEYCODE_4)          PORT_CHAR('4') PORT_CHAR('$')
	PORT_BIT(0x010, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("5")          PORT_CODE(KEYCODE_5)          PORT_CHAR('5') PORT_CHAR('%')
	PORT_BIT(0x020, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("6")          PORT_CODE(KEYCODE_6)          PORT_CHAR('6') PORT_CHAR('^')
	PORT_BIT(0x040, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("7")          PORT_CODE(KEYCODE_7)          PORT_CHAR('7') PORT_CHAR('&')
	PORT_BIT(0x080, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("8")          PORT_CODE(KEYCODE_8)          PORT_CHAR('8') PORT_CHAR('*')
	PORT_BIT(0x100, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("9")          PORT_CODE(KEYCODE_9)          PORT_CHAR('9') PORT_CHAR('(')
	PORT_BIT(0x200, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Esc")        PORT_CODE(KEYCODE_ESC)        PORT_CHAR(27)

	PORT_START("SW401")
	PORT_DIPNAME( 0x0f, 0x0c, "Baud Rate")
	PORT_DIPSETTING(    0x01, "110")
	PORT_DIPSETTING(    0x02, "150")
	PORT_DIPSETTING(    0x03, "300")
	PORT_DIPSETTING(    0x04, "600")
	PORT_DIPSETTING(    0x05, "1200")
	PORT_DIPSETTING(    0x06, "1800")
	PORT_DIPSETTING(    0x07, "2000")
	PORT_DIPSETTING(    0x08, "2400")
	PORT_DIPSETTING(    0x09, "3600")
	PORT_DIPSETTING(    0x0a, "4800")
	PORT_DIPSETTING(    0x0b, "7200")
	PORT_DIPSETTING(    0x0c, "9600")
	PORT_DIPSETTING(    0x0d, "19200")
	PORT_DIPNAME( 0x30, 0x00, "Parity")
	PORT_DIPSETTING(    0x00, DEF_STR(None))
	PORT_DIPSETTING(    0x10, "Odd")
	PORT_DIPSETTING(    0x30, "Even")
	PORT_DIPNAME( 0x40, 0x00, "Parity Type")
	PORT_DIPSETTING(    0x00, DEF_STR(Normal))
	PORT_DIPSETTING(    0x40, "Stick")
	PORT_DIPNAME( 0x80, 0x80, "Duplex")
	PORT_DIPSETTING(    0x00, "Half")
	PORT_DIPSETTING(    0x80, "Full")

	PORT_START("SW402") // stored at 40C8
	PORT_DIPNAME( 0x01, 0x00, "Cursor")
	PORT_DIPSETTING(    0x00, "Underline")
	PORT_DIPSETTING(    0x01, "Block")
	PORT_DIPNAME( 0x02, 0x00, "Keyclick")
	PORT_DIPSETTING(    0x02, DEF_STR(No))
	PORT_DIPSETTING(    0x00, DEF_STR(Yes))
	PORT_DIPNAME( 0x04, 0x00, "Wrap at EOL")
	PORT_DIPSETTING(    0x00, DEF_STR(No))
	PORT_DIPSETTING(    0x04, DEF_STR(Yes))
	PORT_DIPNAME( 0x08, 0x00, "Auto LF on CR")
	PORT_DIPSETTING(    0x00, DEF_STR(No))
	PORT_DIPSETTING(    0x08, DEF_STR(Yes))
	PORT_DIPNAME( 0x10, 0x00, "Auto CR on LF")
	PORT_DIPSETTING(    0x00, DEF_STR(No))
	PORT_DIPSETTING(    0x10, DEF_STR(Yes))
	PORT_DIPNAME( 0x20, 0x00, "Mode")
	PORT_DIPSETTING(    0x00, "VT52")
	PORT_DIPSETTING(    0x20, "ANSI")
	PORT_DIPNAME( 0x40, 0x00, "Keypad Shifted")
	PORT_DIPSETTING(    0x00, DEF_STR(No))
	PORT_DIPSETTING(    0x40, DEF_STR(Yes))
	PORT_DIPNAME( 0x80, 0x00, "Refresh")
	PORT_DIPSETTING(    0x00, "50Hz")
	PORT_DIPSETTING(    0x80, "60Hz")
INPUT_PORTS_END

// Keyboard encoder masks
#define KB_ENCODER_KEY_VALUE_MASK 0x7F
#define KB_ENCODER_CONTROL_KEY_MASK 0x80

// Keyboard flag masks
#define KB_STATUS_SHIFT_KEYS_MASK 0x01
#define KB_STATUS_CAPS_LOCK_MASK  0x02
#define KB_STATUS_BREAK_KEY_MASK  0x04
#define KB_STATUS_ONLINE_KEY_MASK 0x08
#define KB_STATUS_REPEAT_KEYS_MASK 0x40
#define KB_STATUS_KEYBOARD_STROBE_MASK 0x80


void h19_state::machine_reset()
{
}


WRITE8_MEMBER( h19_state::h19_keyclick_w )
{
/* Keyclick - 6 mSec */

	m_beep->set_state(1);
	m_keyclickactive = true;
	timer_set(attotime::from_msec(6), TIMER_KEY_CLICK_OFF);
}

WRITE8_MEMBER( h19_state::h19_bell_w )
{
/* Bell (^G) - 200 mSec */

	m_beep->set_state(1);
	m_bellactive = true;
	timer_set(attotime::from_msec(200), TIMER_BELL_OFF);
}


/***************************************************************************
MM5740 B Mapping to the ROM address

B1     -> A0          A10  =  0
B2     -> A1          A9   =  0
B3     -> A2          A8   =  B8
B4     -> A3          A7   =  B7
B5     -> A4          A6   =  B9
B6     -> A5          A5   =  B6
B7     -> A7          A4   =  B5
B8     -> A8          A3   =  B4
B9     -> A6          A2   =  B3
ground -> A9          A1   =  B2
ground -> A10         A0   =  B1

****************************************************************************/
uint16_t h19_state::translate_mm5740_b(uint16_t b)
{
	return ((b & 0x100) >> 2) | ((b & 0x0c0) << 1) | (b & 0x03f);
}

READ8_MEMBER(h19_state::kbd_key_r)
{
	m_maincpu->set_input_line(INPUT_LINE_IRQ0, CLEAR_LINE);
	m_strobe = false;

	// high bit is for control key pressed, this is handled in the ROM, no processing needed.
	return m_transchar;
}

READ8_MEMBER(h19_state::kbd_flags_r)
{
	uint16_t modifiers = m_kbspecial->read();
	uint8_t rv = modifiers & 0x7f;

	// check both shifts
	if (((modifiers & 0x020) == 0) || ((modifiers & 0x100) == 0))
	{
		rv |= KB_STATUS_SHIFT_KEYS_MASK;
	}

	// invert offline switch
	rv ^= KB_STATUS_ONLINE_KEY_MASK;

	if (!m_strobe)
	{
		rv |= KB_STATUS_KEYBOARD_STROBE_MASK;
	}

	return rv;
}

READ_LINE_MEMBER(h19_state::mm5740_shift_r)
{
	return ((m_kbspecial->read() ^ 0x120) & 0x120) ? ASSERT_LINE : CLEAR_LINE;
}

READ_LINE_MEMBER(h19_state::mm5740_control_r)
{
	return ((m_kbspecial->read() ^ 0x10) & 0x10) ? ASSERT_LINE: CLEAR_LINE;
}

WRITE_LINE_MEMBER(h19_state::mm5740_data_ready_w)
{
	if (state == ASSERT_LINE)
	{
		uint8_t *decode = m_kbdrom->base();

		m_transchar = decode[translate_mm5740_b(m_mm5740->b_r())];
		m_strobe = true;
		m_maincpu->set_input_line(INPUT_LINE_IRQ0, ASSERT_LINE);
	}
}

MC6845_UPDATE_ROW( h19_state::crtc_update_row )
{
	const rgb_t *palette = m_palette->palette()->entry_list_raw();
	uint32_t *p = &bitmap.pix32(y);

	for (uint16_t x = 0; x < x_count; x++)
	{
		uint8_t inv = (x == cursor_x) ? 0xff : 0;

		uint8_t chr = m_p_videoram[(ma + x) & 0x7ff];

		if (chr & 0x80)
		{
			inv ^= 0xff;
			chr &= 0x7f;
		}

		/* get pattern of pixels for that character scanline */
		uint8_t gfx = m_p_chargen[(chr<<4) | ra] ^ inv;

		/* Display a scanline of a character (8 pixels) */
		*p++ = palette[BIT(gfx, 7)];
		*p++ = palette[BIT(gfx, 6)];
		*p++ = palette[BIT(gfx, 5)];
		*p++ = palette[BIT(gfx, 4)];
		*p++ = palette[BIT(gfx, 3)];
		*p++ = palette[BIT(gfx, 2)];
		*p++ = palette[BIT(gfx, 1)];
		*p++ = palette[BIT(gfx, 0)];
	}
}


/* F4 Character Displayer */
static const gfx_layout h19_charlayout =
{
	8, 10,                  /* 8 x 10 characters */
	128,                    /* 128 characters */
	1,                      /* 1 bits per pixel */
	{ 0 },                  /* no bitplanes */
	/* x offsets */
	{ 0, 1, 2, 3, 4, 5, 6, 7 },
	/* y offsets */
	{ 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8, 8*8, 9*8 },
	8*16                    /* every char takes 16 bytes */
};

static GFXDECODE_START( h19 )
	GFXDECODE_ENTRY( "chargen", 0x0000, h19_charlayout, 0, 1 )
GFXDECODE_END

MACHINE_CONFIG_START(h19_state::h19)
	/* basic machine hardware */
	MCFG_CPU_ADD("maincpu", Z80, H19_CLOCK) // From schematics
	MCFG_CPU_PROGRAM_MAP(mem_map)
	MCFG_CPU_IO_MAP(io_map)

	/* video hardware */
	// TODO: make configurable, Heath offered 3 different CRTs - White, Green, Amber.
	MCFG_SCREEN_ADD_MONOCHROME("screen", RASTER, rgb_t::green())
	MCFG_SCREEN_REFRESH_RATE(60)   // TODO- this is adjustable by dipswitch.
	MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500)) /* not accurate */
	MCFG_SCREEN_UPDATE_DEVICE("crtc", mc6845_device, screen_update)

	MCFG_SCREEN_SIZE(640, 250)
	MCFG_SCREEN_VISIBLE_AREA(0, 640 - 1, 0, 250 - 1)
	MCFG_GFXDECODE_ADD("gfxdecode", "palette", h19)
	MCFG_PALETTE_ADD_MONOCHROME("palette")

	MCFG_MC6845_ADD("crtc", MC6845, "screen", MC6845_CLOCK)
	MCFG_MC6845_SHOW_BORDER_AREA(true)
	MCFG_MC6845_CHAR_WIDTH(8)
	MCFG_MC6845_UPDATE_ROW_CB(h19_state, crtc_update_row)
	MCFG_MC6845_OUT_VSYNC_CB(INPUTLINE("maincpu", INPUT_LINE_NMI)) // frame pulse

	MCFG_DEVICE_ADD("ins8250", INS8250, INS8250_CLOCK)
	MCFG_INS8250_OUT_INT_CB(INPUTLINE("maincpu", INPUT_LINE_IRQ0))

	MCFG_DEVICE_ADD(KBDC_TAG, MM5740, MM5740_CLOCK)
	MCFG_MM5740_MATRIX_X1(IOPORT("X1"))
	MCFG_MM5740_MATRIX_X2(IOPORT("X2"))
	MCFG_MM5740_MATRIX_X3(IOPORT("X3"))
	MCFG_MM5740_MATRIX_X4(IOPORT("X4"))
	MCFG_MM5740_MATRIX_X5(IOPORT("X5"))
	MCFG_MM5740_MATRIX_X6(IOPORT("X6"))
	MCFG_MM5740_MATRIX_X7(IOPORT("X7"))
	MCFG_MM5740_MATRIX_X8(IOPORT("X8"))
	MCFG_MM5740_MATRIX_X9(IOPORT("X9"))
	MCFG_MM5740_SHIFT_CB(READLINE(h19_state, mm5740_shift_r))
	MCFG_MM5740_CONTROL_CB(READLINE(h19_state, mm5740_control_r))
	MCFG_MM5740_DATA_READY_CB(WRITELINE(h19_state, mm5740_data_ready_w))

	/* sound hardware */
	MCFG_SPEAKER_STANDARD_MONO("mono")
	MCFG_SOUND_ADD("beeper", BEEP, H19_BEEP_FRQ)
	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.00)
MACHINE_CONFIG_END

/* ROM definition */
ROM_START( h19 )
	ROM_REGION( 0x10000, "maincpu", ROMREGION_ERASEFF )
	// Original
	ROM_LOAD( "2732_444-46_h19code.bin", 0x0000, 0x1000, CRC(f4447da0) SHA1(fb4093d5b763be21a9580a0defebed664b1f7a7b))

	ROM_REGION( 0x0800, "chargen", 0 )
	// Original font dump
	ROM_LOAD( "2716_444-29_h19font.bin", 0x0000, 0x0800, CRC(d595ac1d) SHA1(130fb4ea8754106340c318592eec2d8a0deaf3d0))

	ROM_REGION( 0x1000, "keyboard", 0 )
	// Original dump
	ROM_LOAD( "2716_444-37_h19keyb.bin", 0x0000, 0x0800, CRC(5c3e6972) SHA1(df49ce64ae48652346a91648c58178a34fb37d3c))
ROM_END

ROM_START( super19 )
	// Super H19 ROM
	ROM_REGION( 0x10000, "maincpu", ROMREGION_ERASEFF )
	ROM_LOAD( "2732_super19_h447.bin", 0x0000, 0x1000, CRC(6c51aaa6) SHA1(5e368b39fe2f1af44a905dc474663198ab630117))

	ROM_REGION( 0x0800, "chargen", 0 )
	// Original font dump
	ROM_LOAD( "2716_444-29_h19font.bin", 0x0000, 0x0800, CRC(d595ac1d) SHA1(130fb4ea8754106340c318592eec2d8a0deaf3d0))

	ROM_REGION( 0x1000, "keyboard", 0 )
	// Original dump
	ROM_LOAD( "2716_444-37_h19keyb.bin", 0x0000, 0x0800, CRC(5c3e6972) SHA1(df49ce64ae48652346a91648c58178a34fb37d3c))
ROM_END

ROM_START( watz19 )
	// Watzman ROM
	ROM_REGION( 0x10000, "maincpu", ROMREGION_ERASEFF )
	ROM_LOAD( "watzman.bin", 0x0000, 0x1000, CRC(8168b6dc) SHA1(bfaebb9d766edbe545d24bc2b6630be4f3aa0ce9))

	ROM_REGION( 0x0800, "chargen", 0 )
	// Original font dump
	ROM_LOAD( "2716_444-29_h19font.bin", 0x0000, 0x0800, CRC(d595ac1d) SHA1(130fb4ea8754106340c318592eec2d8a0deaf3d0))
	// Watzman keyboard
	ROM_REGION( 0x1000, "keyboard", 0 )
	ROM_LOAD( "keybd.bin", 0x0000, 0x0800, CRC(58dc8217) SHA1(1b23705290bdf9fc6342065c6a528c04bff67b13))
ROM_END

ROM_START( ultra19 )
	// ULTRA ROM
	ROM_REGION( 0x10000, "maincpu", ROMREGION_ERASEFF )
	ROM_LOAD( "2532_h19_ultra_firmware.bin", 0x0000, 0x1000, CRC(8ad4cdb4) SHA1(d6e1fc37a1f52abfce5e9adb1819e0030bed1df3))

	ROM_REGION( 0x0800, "chargen", 0 )
	// Original font dump
	ROM_LOAD( "2716_444-29_h19font.bin", 0x0000, 0x0800, CRC(d595ac1d) SHA1(130fb4ea8754106340c318592eec2d8a0deaf3d0))
	// Watzman keyboard
	ROM_REGION( 0x1000, "keyboard", 0 )
	ROM_LOAD( "2716_h19_ultra_keyboard.bin", 0x0000, 0x0800, CRC(76130c92) SHA1(ca39c602af48505139d2750a084b5f8f0e662ff7))
ROM_END


//    YEAR  NAME     PARENT  COMPAT  MACHINE  INPUT  STATE       INIT   COMPANY      FULLNAME                         FLAGS
COMP( 1979, h19,     0,      0,      h19,     h19,   h19_state,  0,     "Heath Inc", "Heathkit H-19",                 0 )
//Super-19 ROM - ATG Systems, Inc - Adv in Sextant Issue 4, Winter 1983. With the magazine lead-time, likely released late 1982.
COMP( 1982, super19, h19,    0,      h19,     h19,   h19_state,  0,     "Heath Inc", "Heathkit H-19 w/ Super-19 ROM", 0 )
// Watzman ROM - HUG p/n 885-1121, announced in REMark Issue 33, Oct. 1982
COMP( 1982, watz19,  h19,    0,      h19,     h19,   h19_state,  0,     "Heath Inc", "Heathkit H-19 w/ Watzman ROM",  0 )
// ULTRA ROM - Software Wizardry, Inc., (c) 1983 William G. Parrott, III
COMP( 1983, ultra19, h19,    0,      h19,     h19,   h19_state,  0,     "Heath Inc", "Heathkit H-19 w/ ULTRA ROM",    0 )