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path: root/src/mess/drivers/alphatro.c
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// license:MAME
// copyright-holders:Barry Rodewald, Robbbert
/***************************************************************************

    Triumph-Adler's Alphatronic PC

    skeleton driver

    z80 + HD46505SP as a CRTC

    Other chips: 8251, 8257, 8259
    Crystals: 16MHz, 17.73447MHz
    Floppy format: 2 sides, 40 tracks, 16 sectors, 256 bytes = 320kb.
    FDC (unknown) is in a plug-in module.

    Has a socket for monochrome (to the standard amber monitor),
    and another for RGB. We emulate this with a configuration switch.

    The Z80 must start at E000, but unlike other designs (Super80 for
    example) which cause the ROMs to appear everywhere during boot,
    this one (it seems) holds the data bus low until E000 is reached.
    This kind of boot still needs to be emulated.

    This machine has 64k RAM, the ROMs being copied into RAM when
    needed.

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

#include "emu.h"
#include "cpu/z80/z80.h"
#include "video/mc6845.h"
#include "machine/i8251.h"
#include "machine/clock.h"
#include "imagedev/cassette.h"
#include "sound/beep.h"
#include "sound/wave.h"
#include "machine/ram.h"

#define MAIN_CLOCK XTAL_4MHz


class alphatro_state : public driver_device
{
public:
	enum
	{
		TIMER_SYSTEM,
		TIMER_ALPHATRO_BEEP_OFF
	};

	alphatro_state(const machine_config &mconfig, device_type type, const char *tag)
		: driver_device(mconfig, type, tag),
	m_maincpu(*this, "maincpu"),
	m_crtc(*this, "crtc"),
	m_usart(*this, "usart"),
	m_cass(*this, "cassette"),
	m_beep(*this, "beeper"),
	m_p_ram(*this, "p_ram"),
	m_p_videoram(*this, "videoram"){ }

	required_device<cpu_device> m_maincpu;
	required_device<mc6845_device> m_crtc;
	required_device<i8251_device> m_usart;
	required_device<cassette_image_device> m_cass;
	required_device<beep_device> m_beep;

	DECLARE_READ8_MEMBER(port10_r);
	DECLARE_WRITE8_MEMBER(port10_w);
	DECLARE_INPUT_CHANGED_MEMBER(alphatro_break);
	DECLARE_WRITE_LINE_MEMBER(txdata_callback);
	DECLARE_WRITE_LINE_MEMBER(write_usart_clock);
	TIMER_DEVICE_CALLBACK_MEMBER(alphatro_c);
	TIMER_DEVICE_CALLBACK_MEMBER(alphatro_p);

	required_shared_ptr<UINT8> m_p_ram;
	required_shared_ptr<UINT8> m_p_videoram;
	emu_timer* m_sys_timer;
	UINT8 *m_p_chargen;
	virtual void video_start();
	virtual void machine_start();
	virtual void machine_reset();
	virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr);

private:
	UINT8 m_timer_bit;
	UINT8 m_cass_data[4];
	bool m_cass_state;
	virtual void palette_init();
};

READ8_MEMBER( alphatro_state::port10_r )
{
	//return (space.machine().device<screen_device>("screen")->vblank() ? 0x00 : 0x80);
	return m_timer_bit;
}

WRITE8_MEMBER( alphatro_state::port10_w )
{
// Bit 0 -> 0 = 40 cols; 1 = 80 cols
// Bit 1 ? each keystroke, and a lot when it scrolls
// Bit 2 ? after a cload
// Bit 3 -> cassette relay
// Bit 4 -> BEEP

	UINT16 length = 0;
	data &= 0xfe;

	if (data == 0x10)
		length = 400; // BEEP command

	if (length)
	{
		timer_set(attotime::from_msec(length), TIMER_ALPHATRO_BEEP_OFF);
		m_beep->set_state(1);
	}

	m_cass->change_state( BIT(data, 3) ? CASSETTE_MOTOR_ENABLED : CASSETTE_MOTOR_DISABLED, CASSETTE_MASK_MOTOR);

	if (BIT(data,2))
		m_cass_state = 1;
}

void alphatro_state::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
{
	switch(id)
	{
	case TIMER_SYSTEM:
		m_timer_bit ^= 0x80;
		break;
	case TIMER_ALPHATRO_BEEP_OFF:
		m_beep->set_state(0);
		break;
	default:
		assert_always(FALSE, "Unknown id in alphatro_state::device_timer");
	}
}

WRITE_LINE_MEMBER( alphatro_state::txdata_callback )
{
	m_cass_state = state;
}

WRITE_LINE_MEMBER( alphatro_state::write_usart_clock )
{
	m_usart->write_txc(state);
	m_usart->write_rxc(state);
}

void alphatro_state::video_start()
{
	m_p_chargen = memregion("chargen")->base();
}

static MC6845_UPDATE_ROW( alphatro_update_row )
{
	alphatro_state *state = device->machine().driver_data<alphatro_state>();
	const rgb_t *pens = bitmap.palette()->entry_list_raw();
	bool palette = BIT(state->ioport("CONFIG")->read(), 5);
	UINT8 chr,gfx,attr,fg,inv;
	UINT16 mem,x;
	UINT32 *p = &bitmap.pix32(y);

	for (x = 0; x < x_count; x++)
	{
		inv = (x == cursor_x) ? 0xff : 0;
		mem = (ma + x) & 0x7ff;
		chr = state->m_p_videoram[mem];
		attr = state->m_p_videoram[mem | 0x800];
		fg = (palette) ? 8 : attr & 7; // amber or RGB

		if (BIT(attr, 7)) // reverse video for fkey labels
		{
			inv ^= 0xff;
			chr &= 0x7f;
		}

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

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

INPUT_CHANGED_MEMBER( alphatro_state::alphatro_break )
{
	m_maincpu->set_input_line(INPUT_LINE_IRQ0, HOLD_LINE);
}

static ADDRESS_MAP_START( alphatro_map, AS_PROGRAM, 8, alphatro_state )
	AM_RANGE(0x0000, 0xefff) AM_RAM AM_SHARE("p_ram")
	AM_RANGE(0xf000, 0xffff) AM_RAM AM_SHARE("videoram")
ADDRESS_MAP_END

static ADDRESS_MAP_START( alphatro_io, AS_IO, 8, alphatro_state )
	ADDRESS_MAP_GLOBAL_MASK(0xff)
	ADDRESS_MAP_UNMAP_HIGH
	AM_RANGE(0x10, 0x10) AM_READWRITE(port10_r,port10_w)
	AM_RANGE(0x20, 0x20) AM_READ_PORT("X0")
	AM_RANGE(0x21, 0x21) AM_READ_PORT("X1")
	AM_RANGE(0x22, 0x22) AM_READ_PORT("X2")
	AM_RANGE(0x23, 0x23) AM_READ_PORT("X3")
	AM_RANGE(0x24, 0x24) AM_READ_PORT("X4")
	AM_RANGE(0x25, 0x25) AM_READ_PORT("X5")
	AM_RANGE(0x26, 0x26) AM_READ_PORT("X6")
	AM_RANGE(0x27, 0x27) AM_READ_PORT("X7")
	AM_RANGE(0x28, 0x28) AM_READ_PORT("X8")
	AM_RANGE(0x29, 0x29) AM_READ_PORT("X9")
	AM_RANGE(0x2a, 0x2a) AM_READ_PORT("XA")
	AM_RANGE(0x2b, 0x2b) AM_READ_PORT("XB")
	//AM_RANGE(0x30, 0x30) unknown
	// USART for cassette reading and writing
	AM_RANGE(0x40, 0x40) AM_DEVREADWRITE("usart", i8251_device, data_r, data_w)
	AM_RANGE(0x41, 0x41) AM_DEVREADWRITE("usart", i8251_device, status_r, control_w)
	// CRTC - HD46505 / HD6845SP
	AM_RANGE(0x50, 0x50) AM_DEVWRITE("crtc", mc6845_device, address_w)
	AM_RANGE(0x51, 0x51) AM_DEVREADWRITE("crtc", mc6845_device, register_r, register_w)
ADDRESS_MAP_END

static INPUT_PORTS_START( alphatro )
	PORT_START("X0")
	PORT_BIT(0x01,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("Keypad 0") PORT_CODE(KEYCODE_0_PAD) PORT_CHAR(UCHAR_MAMEKEY(0_PAD))
	PORT_BIT(0x02,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("Keypad 1") PORT_CODE(KEYCODE_1_PAD) PORT_CHAR(UCHAR_MAMEKEY(1_PAD))
	PORT_BIT(0x04,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("Keypad 2") PORT_CODE(KEYCODE_2_PAD) PORT_CHAR(UCHAR_MAMEKEY(2_PAD))
	PORT_BIT(0x08,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("Keypad 3") PORT_CODE(KEYCODE_3_PAD) PORT_CHAR(UCHAR_MAMEKEY(3_PAD))
	PORT_BIT(0x10,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("Keypad 4") PORT_CODE(KEYCODE_4_PAD) PORT_CHAR(UCHAR_MAMEKEY(4_PAD))
	PORT_BIT(0x20,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("Keypad 5") PORT_CODE(KEYCODE_5_PAD) PORT_CHAR(UCHAR_MAMEKEY(5_PAD))
	PORT_BIT(0x40,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("Keypad 6") PORT_CODE(KEYCODE_6_PAD) PORT_CHAR(UCHAR_MAMEKEY(6_PAD))
	PORT_BIT(0x80,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("Keypad 7") PORT_CODE(KEYCODE_7_PAD) PORT_CHAR(UCHAR_MAMEKEY(7_PAD))

	PORT_START("X1")
	PORT_BIT(0x01,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("Keypad 8") PORT_CODE(KEYCODE_8_PAD) PORT_CHAR(UCHAR_MAMEKEY(8_PAD))
	PORT_BIT(0x02,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("Keypad 9") PORT_CODE(KEYCODE_9_PAD) PORT_CHAR(UCHAR_MAMEKEY(9_PAD))
	PORT_BIT(0x04,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("Keypad .") PORT_CODE(KEYCODE_DEL_PAD)
	PORT_BIT(0x10,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("Keypad - /") PORT_CODE(KEYCODE_MINUS_PAD)
	PORT_BIT(0x20,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("Keypad =") PORT_CODE(KEYCODE_ASTERISK) // keypad equals
	PORT_BIT(0x40,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("Keypad + x") PORT_CODE(KEYCODE_PLUS_PAD)

	PORT_START("X2")
	PORT_BIT(0x02,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("A") PORT_CODE(KEYCODE_A) PORT_CHAR('a') PORT_CHAR('A')
	PORT_BIT(0x04,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("B") PORT_CODE(KEYCODE_B) PORT_CHAR('b') PORT_CHAR('B')
	PORT_BIT(0x08,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("C") PORT_CODE(KEYCODE_C) PORT_CHAR('c') PORT_CHAR('C')
	PORT_BIT(0x10,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("D") PORT_CODE(KEYCODE_D) PORT_CHAR('d') PORT_CHAR('D')
	PORT_BIT(0x20,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("E") PORT_CODE(KEYCODE_E) PORT_CHAR('e') PORT_CHAR('E')
	PORT_BIT(0x40,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("F") PORT_CODE(KEYCODE_F) PORT_CHAR('f') PORT_CHAR('F')
	PORT_BIT(0x80,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("G") PORT_CODE(KEYCODE_G) PORT_CHAR('g') PORT_CHAR('G')

	PORT_START("X3")
	PORT_BIT(0x01,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("H") PORT_CODE(KEYCODE_H) PORT_CHAR('h') PORT_CHAR('H')
	PORT_BIT(0x02,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("I") PORT_CODE(KEYCODE_I) PORT_CHAR('i') PORT_CHAR('I')
	PORT_BIT(0x04,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("J") PORT_CODE(KEYCODE_J) PORT_CHAR('j') PORT_CHAR('J')
	PORT_BIT(0x08,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("K") PORT_CODE(KEYCODE_K) PORT_CHAR('k') PORT_CHAR('K')
	PORT_BIT(0x10,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("L") PORT_CODE(KEYCODE_L) PORT_CHAR('l') PORT_CHAR('L')
	PORT_BIT(0x20,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("M") PORT_CODE(KEYCODE_M) PORT_CHAR('m') PORT_CHAR('M')
	PORT_BIT(0x40,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("N") PORT_CODE(KEYCODE_N) PORT_CHAR('n') PORT_CHAR('N')
	PORT_BIT(0x80,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("O") PORT_CODE(KEYCODE_O) PORT_CHAR('o') PORT_CHAR('O')

	PORT_START("X4")
	PORT_BIT(0x01,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("P") PORT_CODE(KEYCODE_P) PORT_CHAR('p') PORT_CHAR('P')
	PORT_BIT(0x02,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("Q") PORT_CODE(KEYCODE_Q) PORT_CHAR('q') PORT_CHAR('Q')
	PORT_BIT(0x04,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("R") PORT_CODE(KEYCODE_R) PORT_CHAR('r') PORT_CHAR('R')
	PORT_BIT(0x08,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("S") PORT_CODE(KEYCODE_S) PORT_CHAR('s') PORT_CHAR('S')
	PORT_BIT(0x10,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("T") PORT_CODE(KEYCODE_T) PORT_CHAR('t') PORT_CHAR('T')
	PORT_BIT(0x20,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("U") PORT_CODE(KEYCODE_U) PORT_CHAR('u') PORT_CHAR('U')
	PORT_BIT(0x40,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("V") PORT_CODE(KEYCODE_V) PORT_CHAR('v') PORT_CHAR('V')
	PORT_BIT(0x80,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("W") PORT_CODE(KEYCODE_W) PORT_CHAR('w') PORT_CHAR('W')

	PORT_START("X5")
	PORT_BIT(0x01,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("X") PORT_CODE(KEYCODE_X) PORT_CHAR('x') PORT_CHAR('X')
	PORT_BIT(0x02,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("Y") PORT_CODE(KEYCODE_Y) PORT_CHAR('y') PORT_CHAR('Y')
	PORT_BIT(0x04,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("Z") PORT_CODE(KEYCODE_Z) PORT_CHAR('z') PORT_CHAR('Z')

	PORT_START("X6")
	PORT_BIT(0x01,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("0") PORT_CODE(KEYCODE_0) PORT_CHAR('0') PORT_CHAR('_')
	PORT_BIT(0x02,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("1") PORT_CODE(KEYCODE_1) PORT_CHAR('1') PORT_CHAR('!')
	PORT_BIT(0x04,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("2") PORT_CODE(KEYCODE_2) PORT_CHAR('2') PORT_CHAR('\"')
	PORT_BIT(0x08,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("3") PORT_CODE(KEYCODE_3) PORT_CHAR('3') PORT_CHAR(0xa3)
	PORT_BIT(0x10,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("4") PORT_CODE(KEYCODE_4) PORT_CHAR('4') PORT_CHAR('$')
	PORT_BIT(0x20,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("5") PORT_CODE(KEYCODE_5) PORT_CHAR('5') PORT_CHAR('%')
	PORT_BIT(0x40,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("6") PORT_CODE(KEYCODE_6) PORT_CHAR('6') PORT_CHAR('&')
	PORT_BIT(0x80,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("7") PORT_CODE(KEYCODE_7) PORT_CHAR('7') PORT_CHAR('\'')

	PORT_START("X7")
	PORT_BIT(0x01,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("8") PORT_CODE(KEYCODE_8) PORT_CHAR('8') PORT_CHAR('(')
	PORT_BIT(0x02,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("9") PORT_CODE(KEYCODE_9) PORT_CHAR('9') PORT_CHAR(')')
	PORT_BIT(0x04,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("- =") PORT_CODE(KEYCODE_MINUS) PORT_CHAR('-') PORT_CHAR('=')
	PORT_BIT(0x08,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("^ ~") PORT_CODE(KEYCODE_EQUALS) PORT_CHAR('^') PORT_CHAR('~')
	PORT_BIT(0x10,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("@ `") PORT_CODE(KEYCODE_DEL) PORT_CHAR('@') PORT_CHAR('`')
	PORT_BIT(0x20,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("[ {") PORT_CODE(KEYCODE_OPENBRACE) PORT_CHAR('[') PORT_CHAR('{')
	PORT_BIT(0x40,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("] }") PORT_CODE(KEYCODE_CLOSEBRACE) PORT_CHAR(']') PORT_CHAR('}')
	PORT_BIT(0x80,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME(": *") PORT_CODE(KEYCODE_QUOTE) PORT_CHAR(':') PORT_CHAR('*')

	PORT_START("X8")
	PORT_BIT(0x04,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("Space") PORT_CODE(KEYCODE_SPACE) PORT_CHAR(32)
	PORT_BIT(0x08,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("\\ |") PORT_CODE(KEYCODE_BACKSLASH) PORT_CHAR('\\') PORT_CHAR('|')
	PORT_BIT(0x10,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME(", <") PORT_CODE(KEYCODE_COMMA) PORT_CHAR(',') PORT_CHAR('<')
	PORT_BIT(0x20,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME(". >") PORT_CODE(KEYCODE_STOP) PORT_CHAR('.') PORT_CHAR('>')
	PORT_BIT(0x40,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("/ ?") PORT_CODE(KEYCODE_SLASH) PORT_CHAR('/') PORT_CHAR('?')
	PORT_BIT(0x80,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("; +") PORT_CODE(KEYCODE_COLON) PORT_CHAR(';') PORT_CHAR('+')

	PORT_START("X9")
	PORT_BIT(0x01,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("Down") PORT_CODE(KEYCODE_DOWN) PORT_CHAR(UCHAR_MAMEKEY(DOWN))
	PORT_BIT(0x02,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("Right") PORT_CODE(KEYCODE_RIGHT) PORT_CHAR(UCHAR_MAMEKEY(UP))
	PORT_BIT(0x04,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("Left") PORT_CODE(KEYCODE_LEFT) PORT_CHAR(UCHAR_MAMEKEY(LEFT))
	PORT_BIT(0x08,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("Up") PORT_CODE(KEYCODE_UP) PORT_CHAR(UCHAR_MAMEKEY(UP))
	PORT_BIT(0x20,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("Lock") PORT_CODE(KEYCODE_CAPSLOCK) PORT_CHAR(UCHAR_MAMEKEY(CAPSLOCK))
	PORT_BIT(0x40,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("Ctrl") PORT_CODE(KEYCODE_LCONTROL) PORT_CHAR(UCHAR_SHIFT_2)

	PORT_START("XA")
	PORT_BIT(0x02,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("INS DEL") PORT_CODE(KEYCODE_BACKSPACE)
	PORT_BIT(0x04,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("Shift") PORT_CODE(KEYCODE_LSHIFT) PORT_CHAR(UCHAR_SHIFT_1)
	PORT_BIT(0x08,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("Tab") PORT_CODE(KEYCODE_TAB) PORT_CHAR(9)
	PORT_BIT(0x10,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("Enter") PORT_CODE(KEYCODE_ENTER) PORT_CHAR(13)
	PORT_BIT(0x20,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("Graph") PORT_CODE(KEYCODE_PGUP)
	PORT_BIT(0x40,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("Clear Home") PORT_CODE(KEYCODE_HOME)
	PORT_BIT(0x80,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("ESC") PORT_CODE(KEYCODE_ESC) PORT_CHAR(27)

	PORT_START("XB")
	PORT_BIT(0x04,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("F6") PORT_CODE(KEYCODE_F6)
	PORT_BIT(0x08,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("F5") PORT_CODE(KEYCODE_F5)
	PORT_BIT(0x10,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("F4") PORT_CODE(KEYCODE_F4)
	PORT_BIT(0x20,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("F3") PORT_CODE(KEYCODE_F3)
	PORT_BIT(0x40,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("F2") PORT_CODE(KEYCODE_F2)
	PORT_BIT(0x80,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("F1") PORT_CODE(KEYCODE_F1)

	PORT_START("other")
	PORT_BIT(0x01,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("Break") PORT_CODE(KEYCODE_ESC) PORT_CHANGED_MEMBER(DEVICE_SELF,alphatro_state,alphatro_break,0)

	PORT_START("CONFIG")
	PORT_CONFNAME( 0x20, 0x00, "Monitor")
	PORT_CONFSETTING(    0x00, "RGB")
	PORT_CONFSETTING(    0x20, "Amber")
INPUT_PORTS_END

static const gfx_layout charlayout =
{
	8,16,
	RGN_FRAC(1,1),
	1,
	{ RGN_FRAC(0,1) },
	{ 0, 1, 2, 3, 4, 5, 6, 7 },
	{ 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8, 8*8, 9*8, 10*8, 11*8, 12*8, 13*8, 14*8, 15*8 },
	8*16
};

static GFXDECODE_START( alphatro )
	GFXDECODE_ENTRY( "chargen", 0, charlayout, 0, 4 )
GFXDECODE_END

void alphatro_state::machine_start()
{
	m_sys_timer = timer_alloc(TIMER_SYSTEM);
}

void alphatro_state::machine_reset()
{
	// do what the IPL does
	UINT8* ROM = memregion("maincpu")->base();
	m_maincpu->set_pc(0xe000);
	memcpy(m_p_ram, ROM, 0xf000); // copy BASIC to RAM, which the undumped IPL is supposed to do.
	memcpy(m_p_videoram, ROM+0x1000, 0x1000);

	// probably not correct, exact meaning of port is unknown, vblank/vsync is too slow.
	m_sys_timer->adjust(attotime::from_usec(10),0,attotime::from_usec(10));
	m_timer_bit = 0;
	m_cass_state = 1;
	m_cass_data[0] = 0;
	m_cass_data[1] = 0;
	m_usart->write_rxd(0);
	m_cass_data[3] = 0;
	m_beep->set_state(0);
	m_beep->set_frequency(950);    /* piezo-device needs to be measured */
}

void alphatro_state::palette_init()
{
	// RGB colours
	palette_set_color_rgb(machine(), 0, 0x00, 0x00, 0x00);
	palette_set_color_rgb(machine(), 1, 0x00, 0x00, 0xff);
	palette_set_color_rgb(machine(), 2, 0xff, 0x00, 0x00);
	palette_set_color_rgb(machine(), 3, 0xff, 0x00, 0xff);
	palette_set_color_rgb(machine(), 4, 0x00, 0xff, 0x00);
	palette_set_color_rgb(machine(), 5, 0x00, 0xff, 0xff);
	palette_set_color_rgb(machine(), 6, 0xff, 0xff, 0x00);
	palette_set_color_rgb(machine(), 7, 0xff, 0xff, 0xff);
	// Amber
	palette_set_color_rgb(machine(), 8, 0xf7, 0xaa, 0x00);
}


static MC6845_INTERFACE( alphatro_crtc6845_interface )
{
	false,
	0,0,0,0,
	8,
	NULL,
	alphatro_update_row,
	NULL,
	DEVCB_NULL,
	DEVCB_NULL,
	DEVCB_NULL,
	DEVCB_NULL,
	NULL
};

TIMER_DEVICE_CALLBACK_MEMBER(alphatro_state::alphatro_c)
{
	m_cass_data[3]++;

	if (m_cass_state)
		m_cass->output(BIT(m_cass_data[3], 0) ? -1.0 : +1.0); // 2400Hz
	else
		m_cass->output(BIT(m_cass_data[3], 1) ? -1.0 : +1.0); // 1200Hz
}

TIMER_DEVICE_CALLBACK_MEMBER(alphatro_state::alphatro_p)
{
	/* cassette - turn 1200/2400Hz to a bit */
	m_cass_data[1]++;
	UINT8 cass_ws = (m_cass->input() > +0.03) ? 1 : 0;

	if (cass_ws != m_cass_data[0])
	{
		m_cass_data[0] = cass_ws;
		m_usart->write_rxd((m_cass_data[1] < 12) ? 1 : 0);
		m_cass_data[1] = 0;
	}
}

static const cassette_interface alphatro_cassette_interface =
{
	cassette_default_formats,
	NULL,
	(cassette_state) (CASSETTE_PLAY | CASSETTE_MOTOR_DISABLED | CASSETTE_SPEAKER_ENABLED),
	"alphatro_cass",
	NULL
};

static MACHINE_CONFIG_START( alphatro, alphatro_state )

	/* basic machine hardware */
	MCFG_CPU_ADD("maincpu",Z80,MAIN_CLOCK)
	MCFG_CPU_PROGRAM_MAP(alphatro_map)
	MCFG_CPU_IO_MAP(alphatro_io)

	/* video hardware */
	MCFG_SCREEN_ADD("screen", RASTER)
	MCFG_SCREEN_REFRESH_RATE(60)
	MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500)) // not correct
	MCFG_SCREEN_UPDATE_DEVICE("crtc", mc6845_device, screen_update)
	MCFG_SCREEN_SIZE(32*8, 32*8)
	MCFG_SCREEN_VISIBLE_AREA(0*8, 32*8-1, 2*8, 30*8-1)
	MCFG_GFXDECODE_ADD("gfxdecode", alphatro)
	MCFG_PALETTE_LENGTH(9) // 8 colours + amber

	/* sound hardware */
	MCFG_SPEAKER_STANDARD_MONO("mono")
	MCFG_SOUND_ADD("beeper", BEEP, 0)
	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.00)
	MCFG_SOUND_WAVE_ADD(WAVE_TAG, "cassette")
	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.25)

	/* Devices */
	MCFG_MC6845_ADD("crtc", MC6845, "screen", XTAL_12_288MHz / 8, alphatro_crtc6845_interface) // clk unknown

	MCFG_DEVICE_ADD("usart", I8251, 0)
	MCFG_I8251_TXD_HANDLER(WRITELINE(alphatro_state, txdata_callback))

	MCFG_DEVICE_ADD("usart_clock", CLOCK, 19225) // USART clock - this value loads a real tape
	MCFG_CLOCK_SIGNAL_HANDLER(WRITELINE(alphatro_state, write_usart_clock))

	MCFG_CASSETTE_ADD("cassette", alphatro_cassette_interface)
	MCFG_TIMER_DRIVER_ADD_PERIODIC("alphatro_c", alphatro_state, alphatro_c, attotime::from_hz(4800))
	MCFG_TIMER_DRIVER_ADD_PERIODIC("alphatro_p", alphatro_state, alphatro_p, attotime::from_hz(40000))

	MCFG_RAM_ADD("ram")
	MCFG_RAM_DEFAULT_SIZE("64K")

	// software list
	MCFG_SOFTWARE_LIST_ADD("flop_list", "alphatro_flop")
MACHINE_CONFIG_END


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

  Game driver(s)

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

ROM_START( alphatro )
	ROM_REGION( 0x10000, "maincpu", ROMREGION_ERASE00)
	ROM_LOAD( "613256.ic-1058", 0x0000, 0x6000, CRC(ceea4cb3) SHA1(b332dea0a2d3bb2978b8422eb0723960388bb467) )
	ROM_LOAD( "2764.ic-1038",   0xe000, 0x2000, CRC(e337db3b) SHA1(6010bade6a21975636383179903b58a4ca415e49) )

	ROM_REGION( 0x10000, "user1", ROMREGION_ERASE00 )
	ROM_LOAD( "ipl.bin",        0x8000, 0x2000, NO_DUMP  )

	ROM_REGION( 0x1000, "chargen", 0 )
	ROM_LOAD( "2732.ic-1067",   0x0000, 0x1000, CRC(61f38814) SHA1(35ba31c58a10d5bd1bdb202717792ca021dbe1a8) )
ROM_END

COMP( 1983, alphatro,   0,       0,    alphatro,   alphatro, driver_device,  0,  "Triumph-Adler", "Alphatronic PC", GAME_NOT_WORKING )