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path: root/src/mame/drivers/a5105.cpp
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// license:BSD-3-Clause
// copyright-holders:Angelo Salese, Robbbert
/***************************************************************************

    A5105

    12/05/2009 Skeleton driver.

    http://www.robotrontechnik.de/index.htm?/html/computer/a5105.htm
    http://www.sax.de/~zander/bic/bic_bw.html

    - this looks like "somehow" inspired by the MSX1 machine?


ToDo:
- Cassette Load (bit 7 of port 91)


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

#include "emu.h"

#include "cpu/z80/z80.h"
#include "imagedev/cassette.h"
#include "imagedev/flopdrv.h"
#include "machine/ram.h"
#include "machine/upd765.h"
#include "machine/z80ctc.h"
#include "machine/z80pio.h"
#include "sound/beep.h"
#include "sound/wave.h"
#include "video/upd7220.h"

#include "screen.h"
#include "speaker.h"

#include "formats/a5105_dsk.h"


class a5105_state : public driver_device
{
public:
	a5105_state(const machine_config &mconfig, device_type type, const char *tag)
		: driver_device(mconfig, type, tag)
		, m_maincpu(*this, "maincpu")
		, m_screen(*this, "screen")
		, m_hgdc(*this, "upd7220")
		, m_cass(*this, "cassette")
		, m_beep(*this, "beeper")
		, m_fdc(*this, "upd765a")
		, m_floppy0(*this, "upd765a:0")
		, m_floppy1(*this, "upd765a:1")
		, m_floppy2(*this, "upd765a:2")
		, m_floppy3(*this, "upd765a:3")
		, m_video_ram(*this, "video_ram")
		, m_ram(*this, RAM_TAG)
		, m_gfxdecode(*this, "gfxdecode")
		, m_palette(*this, "palette")
		{ }

	DECLARE_READ8_MEMBER(a5105_memsel_r);
	DECLARE_READ8_MEMBER(key_r);
	DECLARE_READ8_MEMBER(key_mux_r);
	DECLARE_WRITE8_MEMBER(key_mux_w);
	DECLARE_WRITE8_MEMBER(a5105_ab_w);
	DECLARE_WRITE8_MEMBER(a5105_memsel_w);
	DECLARE_WRITE8_MEMBER( a5105_upd765_w );
	DECLARE_WRITE8_MEMBER(pcg_addr_w);
	DECLARE_WRITE8_MEMBER(pcg_val_w);
	DECLARE_PALETTE_INIT(a5105);
	DECLARE_FLOPPY_FORMATS( floppy_formats );
	UPD7220_DISPLAY_PIXELS_MEMBER( hgdc_display_pixels );
	UPD7220_DRAW_TEXT_LINE_MEMBER( hgdc_draw_text );

	void a5105(machine_config &config);
	void a5105_io(address_map &map);
	void a5105_mem(address_map &map);
	void upd7220_map(address_map &map);
private:
	uint8_t *m_ram_base;
	uint8_t *m_rom_base;
	uint8_t *m_char_ram;
	uint16_t m_pcg_addr;
	uint16_t m_pcg_internal_addr;
	uint8_t m_key_mux;
	uint8_t m_memsel[4];
	virtual void machine_reset() override;
	virtual void video_start() override;
	required_device<cpu_device> m_maincpu;
	required_device<screen_device> m_screen;
	required_device<upd7220_device> m_hgdc;
	required_device<cassette_image_device> m_cass;
	required_device<beep_device> m_beep;
	required_device<upd765a_device> m_fdc;
	required_device<floppy_connector> m_floppy0;
	required_device<floppy_connector> m_floppy1;
	required_device<floppy_connector> m_floppy2;
	required_device<floppy_connector> m_floppy3;
	required_shared_ptr<uint16_t> m_video_ram;
	required_device<ram_device> m_ram;
	required_device<gfxdecode_device> m_gfxdecode;
	required_device<palette_device> m_palette;
};

/* TODO */
UPD7220_DISPLAY_PIXELS_MEMBER( a5105_state::hgdc_display_pixels )
{
	const rgb_t *palette = m_palette->palette()->entry_list_raw();

	int xi,gfx;
	uint8_t pen;

	gfx = m_video_ram[(address & 0x1ffff) >> 1];

	for(xi=0;xi<16;xi++)
	{
		pen = ((gfx >> xi) & 1) ? 7 : 0;

		bitmap.pix32(y, x + xi) = palette[pen];
	}
}

UPD7220_DRAW_TEXT_LINE_MEMBER( a5105_state::hgdc_draw_text )
{
	const rgb_t *palette = m_palette->palette()->entry_list_raw();
	int x;
	int xi,yi;
	int tile,color;
	uint8_t tile_data;

	for( x = 0; x < pitch; x++ )
	{
		tile = (m_video_ram[(((addr+x)*2) & 0x1ffff) >> 1] & 0xff);
		color = ((m_video_ram[(((addr+x)*2) & 0x1ffff) >> 1] >> 8) & 0x0f);

		for( yi = 0; yi < lr; yi++)
		{
			tile_data = m_char_ram[(tile*8+yi) & 0x7ff];

			if(cursor_on && cursor_addr == addr+x && m_screen->frame_number() & 0x10)
				tile_data^=0xff;

			for( xi = 0; xi < 8; xi++)
			{
				int res_x,res_y;
				int pen = (tile_data >> xi) & 1 ? color : 0;

				res_x = x * 8 + xi;
				res_y = y + yi;

				if(yi >= 8) { pen = 0; }

				if(!m_screen->visible_area().contains(res_x+0, res_y))
					continue;

				bitmap.pix32(res_y, res_x) = palette[pen];
			}
		}
	}
}

void a5105_state::a5105_mem(address_map &map)
{
	map.unmap_value_high();
	map(0x0000, 0x3fff).bankr("bank1");
	map(0x4000, 0x7fff).bankr("bank2");
	map(0x8000, 0xbfff).bankrw("bank3");
	map(0xc000, 0xffff).bankrw("bank4");
}

WRITE8_MEMBER( a5105_state::pcg_addr_w )
{
	m_pcg_addr = data << 3;
	m_pcg_internal_addr = 0;
}

WRITE8_MEMBER( a5105_state::pcg_val_w )
{
	m_char_ram[m_pcg_addr | m_pcg_internal_addr] = data;

	m_gfxdecode->gfx(0)->mark_dirty(m_pcg_addr >> 3);

	m_pcg_internal_addr++;
	m_pcg_internal_addr&=7;
}

READ8_MEMBER( a5105_state::key_r )
{
	static const char *const keynames[] = { "KEY0", "KEY1", "KEY2", "KEY3",
											"KEY4", "KEY5", "KEY6", "KEY7",
											"KEY8", "KEY9", "KEYA", "UNUSED",
											"UNUSED", "UNUSED", "UNUSED", "UNUSED" };

	return ioport(keynames[m_key_mux & 0x0f])->read();
}

READ8_MEMBER( a5105_state::key_mux_r )
{
	return m_key_mux;
}

WRITE8_MEMBER( a5105_state::key_mux_w )
{
	/*
	    xxxx ---- unknown
	    ---- xxxx keyboard mux
	*/

	m_key_mux = data;
}

WRITE8_MEMBER( a5105_state::a5105_ab_w )
{
/*port $ab
        ---- 100x tape motor, active low
        ---- 101x tape data
        ---- 110x led (color green)
        ---- 111x key click, active high
*/
	switch (data & 6)
	{
	case 0:
		if (BIT(data, 0))
			m_cass->change_state(CASSETTE_MOTOR_DISABLED,CASSETTE_MASK_MOTOR);
		else
			m_cass->change_state(CASSETTE_MOTOR_ENABLED,CASSETTE_MASK_MOTOR);
		break;

	case 2:
		m_cass->output( BIT(data, 0) ? -1.0 : +1.0);
		break;

	case 4:
		//led
		break;

	case 6:
		m_beep->set_state(BIT(data, 0));
		break;
	}
}

READ8_MEMBER( a5105_state::a5105_memsel_r )
{
	uint8_t res;

	res = (m_memsel[0] & 3) << 0;
	res|= (m_memsel[1] & 3) << 2;
	res|= (m_memsel[2] & 3) << 4;
	res|= (m_memsel[3] & 3) << 6;

	return res;
}

WRITE8_MEMBER( a5105_state::a5105_memsel_w )
{
	address_space &prog = m_maincpu->space( AS_PROGRAM );

	if (m_memsel[0] != ((data & 0x03) >> 0))
	{
		m_memsel[0] = (data & 0x03) >> 0;

		switch (m_memsel[0])
		{
		case 0:
			membank("bank1")->set_base(m_rom_base);
			prog.install_read_bank(0x0000, 0x3fff, "bank1");
			prog.unmap_write(0x0000, 0x3fff);
			break;
		case 2:
			membank("bank1")->set_base(m_ram_base);
			prog.install_readwrite_bank(0x0000, 0x3fff, "bank1");
			break;
		default:
			prog.unmap_readwrite(0x0000, 0x3fff);
			break;
		}
	}

	if (m_memsel[1] != ((data & 0x0c) >> 2))
	{
		m_memsel[1] = (data & 0x0c) >> 2;

		switch (m_memsel[1])
		{
		case 0:
			membank("bank2")->set_base(m_rom_base + 0x4000);
			prog.install_read_bank(0x4000, 0x7fff, "bank2");
			prog.unmap_write(0x4000, 0x4000);
			break;
		case 1:
			membank("bank2")->set_base(memregion("k5651")->base());
			prog.install_read_bank(0x4000, 0x7fff, "bank2");
			prog.unmap_write(0x4000, 0x4000);
			break;
		case 2:
			membank("bank2")->set_base(m_ram_base + 0x4000);
			prog.install_readwrite_bank(0x4000, 0x7fff, "bank2");
			break;
		default:
			prog.unmap_readwrite(0x4000, 0x7fff);
			break;
		}
	}

	if (m_memsel[2] != ((data & 0x30) >> 4))
	{
		m_memsel[2] = (data & 0x30) >> 4;

		switch (m_memsel[2])
		{
		case 0:
			membank("bank3")->set_base(m_rom_base + 0x8000);
			prog.install_read_bank(0x8000, 0xbfff, "bank3");
			prog.unmap_write(0x8000, 0xbfff);
			break;
		case 2:
			membank("bank3")->set_base(m_ram_base + 0x8000);
			prog.install_readwrite_bank(0x8000, 0xbfff, "bank3");
			break;
		default:
			prog.unmap_readwrite(0x8000, 0xbfff);
			break;
		}
	}

	if (m_memsel[3] != ((data & 0xc0) >> 6))
	{
		m_memsel[3] = (data & 0xc0) >> 6;

		switch (m_memsel[3])
		{
		case 2:
			membank("bank4")->set_base(m_ram_base + 0xc000);
			prog.install_readwrite_bank(0xc000, 0xffff, "bank4");
			break;
		default:
			prog.unmap_readwrite(0xc000, 0xffff);
			break;
		}
	}

	//printf("Memsel change to %02x %02x %02x %02x\n",m_memsel[0],m_memsel[1],m_memsel[2],m_memsel[3]);
}

WRITE8_MEMBER( a5105_state::a5105_upd765_w )
{
	m_floppy0->get_device()->mon_w(!BIT(data,0));
	m_floppy1->get_device()->mon_w(!BIT(data,1));
	m_floppy2->get_device()->mon_w(!BIT(data,2));
	m_floppy3->get_device()->mon_w(!BIT(data,3));

	m_fdc->tc_w(BIT(data, 4));
}

void a5105_state::a5105_io(address_map &map)
{
	map.unmap_value_high();
	map.global_mask(0xff);
	map(0x40, 0x41).m(m_fdc, FUNC(upd765a_device::map));
	map(0x48, 0x4f).w(this, FUNC(a5105_state::a5105_upd765_w));

	map(0x80, 0x83).rw("z80ctc", FUNC(z80ctc_device::read), FUNC(z80ctc_device::write));
	map(0x90, 0x93).rw("z80pio", FUNC(z80pio_device::read), FUNC(z80pio_device::write));
	map(0x98, 0x99).rw(m_hgdc, FUNC(upd7220_device::read), FUNC(upd7220_device::write));

	map(0x9c, 0x9c).w(this, FUNC(a5105_state::pcg_val_w));
//  AM_RANGE(0x9d, 0x9d) crtc area (ff-based), palette routes here
	map(0x9e, 0x9e).w(this, FUNC(a5105_state::pcg_addr_w));

//  AM_RANGE(0xa0, 0xa1) ay8910?
	map(0xa8, 0xa8).rw(this, FUNC(a5105_state::a5105_memsel_r), FUNC(a5105_state::a5105_memsel_w));
	map(0xa9, 0xa9).r(this, FUNC(a5105_state::key_r));
	map(0xaa, 0xaa).rw(this, FUNC(a5105_state::key_mux_r), FUNC(a5105_state::key_mux_w));
	map(0xab, 0xab).w(this, FUNC(a5105_state::a5105_ab_w)); //misc output, see above
}

/* Input ports */
static INPUT_PORTS_START( a5105 )
	PORT_START("KEY0")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("0 =") PORT_CODE(KEYCODE_0) PORT_CHAR('0') PORT_CHAR('=')
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("1 !") PORT_CODE(KEYCODE_1) PORT_CHAR('1') PORT_CHAR('!')
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("2 \"") PORT_CODE(KEYCODE_2) PORT_CHAR('2') PORT_CHAR('\"')
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("3 \\") PORT_CODE(KEYCODE_3) PORT_CHAR('3') PORT_CHAR('\\')
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("4 $") PORT_CODE(KEYCODE_4) PORT_CHAR('4') PORT_CHAR('$')
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("5 %") PORT_CODE(KEYCODE_5) PORT_CHAR('5') PORT_CHAR('%')
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("6 &") PORT_CODE(KEYCODE_6) PORT_CHAR('6') PORT_CHAR('&')
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("7 /") PORT_CODE(KEYCODE_7) PORT_CHAR('7') PORT_CHAR('/')

	PORT_START("KEY1")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("8 (") PORT_CODE(KEYCODE_8) PORT_CHAR('8') PORT_CHAR('(')
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("9 )") PORT_CODE(KEYCODE_9) PORT_CHAR('9') PORT_CHAR(')')
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("< >") PORT_CODE(KEYCODE_COLON) PORT_CHAR('<') PORT_CHAR('>')
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("+ *") PORT_CODE(KEYCODE_EQUALS) PORT_CHAR('+') PORT_CHAR('*')
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\xc3\xb6 \xc3\x96") PORT_CODE(KEYCODE_OPENBRACE) PORT_CHAR(0x00f6) PORT_CHAR(0x00d6)
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\xc3\xa4 \xc3\x84") PORT_CODE(KEYCODE_CLOSEBRACE) PORT_CHAR(0x00e4) PORT_CHAR(0x00c4)
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\xc3\xbc \xc3\x9c") PORT_CODE(KEYCODE_QUOTE) PORT_CHAR(0x00fc) PORT_CHAR(0x00dc)
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("# ^") PORT_CODE(KEYCODE_BACKSLASH) PORT_CHAR('#') PORT_CHAR('^')

	PORT_START("KEY2")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("' `") PORT_CODE(KEYCODE_TILDE) PORT_CHAR('\'') PORT_CHAR('`')
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("? beta") PORT_CODE(KEYCODE_SLASH) PORT_CHAR('?')
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME(", ;") PORT_CODE(KEYCODE_COMMA) PORT_CHAR(',') PORT_CHAR(';')
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME(". :") PORT_CODE(KEYCODE_STOP) PORT_CHAR('.') PORT_CHAR(':')
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("- _") PORT_CODE(KEYCODE_MINUS) PORT_CHAR('-') PORT_CHAR('_')
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_UNUSED) // appears to do nothing
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("A") PORT_CODE(KEYCODE_A) PORT_CHAR('a') PORT_CHAR('A')
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("B") PORT_CODE(KEYCODE_B) PORT_CHAR('b') PORT_CHAR('B')

	PORT_START("KEY3")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("C") PORT_CODE(KEYCODE_C) PORT_CHAR('c') PORT_CHAR('C')
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("D") PORT_CODE(KEYCODE_D) PORT_CHAR('d') PORT_CHAR('D')
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("E") PORT_CODE(KEYCODE_E) PORT_CHAR('e') PORT_CHAR('E')
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("F") PORT_CODE(KEYCODE_F) PORT_CHAR('f') PORT_CHAR('F')
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("G") PORT_CODE(KEYCODE_G) PORT_CHAR('g') PORT_CHAR('G')
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("H") PORT_CODE(KEYCODE_H) PORT_CHAR('h') PORT_CHAR('H')
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("I") PORT_CODE(KEYCODE_I) PORT_CHAR('i') PORT_CHAR('I')
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("J") PORT_CODE(KEYCODE_J) PORT_CHAR('j') PORT_CHAR('J')

	PORT_START("KEY4")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("K") PORT_CODE(KEYCODE_K) PORT_CHAR('k') PORT_CHAR('K')
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("L") PORT_CODE(KEYCODE_L) PORT_CHAR('l') PORT_CHAR('L')
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("M") PORT_CODE(KEYCODE_M) PORT_CHAR('m') PORT_CHAR('M')
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("N") PORT_CODE(KEYCODE_N) PORT_CHAR('n') PORT_CHAR('N')
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("O") PORT_CODE(KEYCODE_O) PORT_CHAR('o') PORT_CHAR('O')
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("P") PORT_CODE(KEYCODE_P) PORT_CHAR('p') PORT_CHAR('P')
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Q") PORT_CODE(KEYCODE_Q) PORT_CHAR('q') PORT_CHAR('Q')
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("R") PORT_CODE(KEYCODE_R) PORT_CHAR('r') PORT_CHAR('R')

	PORT_START("KEY5")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("S") PORT_CODE(KEYCODE_S) PORT_CHAR('s') PORT_CHAR('S')
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("T") PORT_CODE(KEYCODE_T) PORT_CHAR('t') PORT_CHAR('T')
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("U") PORT_CODE(KEYCODE_U) PORT_CHAR('u') PORT_CHAR('U')
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("V") PORT_CODE(KEYCODE_V) PORT_CHAR('v') PORT_CHAR('V')
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("W") PORT_CODE(KEYCODE_W) PORT_CHAR('w') PORT_CHAR('W')
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("X") PORT_CODE(KEYCODE_X) PORT_CHAR('x') PORT_CHAR('X')
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Y") PORT_CODE(KEYCODE_Y) PORT_CHAR('y') PORT_CHAR('Y')
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Z") PORT_CODE(KEYCODE_Z) PORT_CHAR('z') PORT_CHAR('Z')

	PORT_START("KEY6")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_LSHIFT) PORT_CHAR(UCHAR_SHIFT_1)
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) /* gives keyclick but does nothing */PORT_CODE(KEYCODE_LCONTROL)    PORT_CHAR(UCHAR_SHIFT_2)
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("GRAPH") PORT_CODE(KEYCODE_PGUP) PORT_CHAR(UCHAR_MAMEKEY(F6))
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("CAPS") PORT_CODE(KEYCODE_CAPSLOCK) PORT_CHAR(UCHAR_MAMEKEY(CAPSLOCK))
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("CODE") PORT_CODE(KEYCODE_PGDN) PORT_CHAR(UCHAR_MAMEKEY(F7))
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("F5") PORT_CODE(KEYCODE_F5) PORT_CHAR(UCHAR_MAMEKEY(F5))
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("F4") PORT_CODE(KEYCODE_F4) PORT_CHAR(UCHAR_MAMEKEY(F4))
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("F3") PORT_CODE(KEYCODE_F3) PORT_CHAR(UCHAR_MAMEKEY(F3))

	PORT_START("KEY7")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("F2") PORT_CODE(KEYCODE_F2) PORT_CHAR(UCHAR_MAMEKEY(F2))
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("F1") PORT_CODE(KEYCODE_F1) PORT_CHAR(UCHAR_MAMEKEY(F1))
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_ESC)      PORT_CHAR(UCHAR_MAMEKEY(ESC))
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_TAB)      PORT_CHAR(9)
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("STOP") PORT_CODE(KEYCODE_RCONTROL) PORT_CHAR(UCHAR_MAMEKEY(F8))
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_BACKSPACE)    PORT_CHAR(8)
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("SELECT") PORT_CODE(KEYCODE_END) PORT_CHAR(UCHAR_MAMEKEY(F9))
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_ENTER)        PORT_CHAR(13)

	PORT_START("KEY8")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_SPACE)        PORT_CHAR(' ')
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_HOME)     PORT_CHAR(UCHAR_MAMEKEY(HOME))
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_INSERT)       PORT_CHAR(UCHAR_MAMEKEY(INSERT))
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("DEL") PORT_CODE(KEYCODE_DEL) PORT_CHAR(UCHAR_MAMEKEY(DEL))
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_LEFT)     PORT_CHAR(UCHAR_MAMEKEY(LEFT))
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_UP)       PORT_CHAR(UCHAR_MAMEKEY(UP))
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_DOWN)     PORT_CHAR(UCHAR_MAMEKEY(DOWN))
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_RIGHT)        PORT_CHAR(UCHAR_MAMEKEY(RIGHT))

	PORT_START("KEY9")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_ASTERISK)     PORT_CHAR(UCHAR_MAMEKEY(ASTERISK))
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_PLUS_PAD)     PORT_CHAR(UCHAR_MAMEKEY(PLUS_PAD))
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_SLASH_PAD)    PORT_CHAR(UCHAR_MAMEKEY(SLASH_PAD))
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_0_PAD)        PORT_CHAR(UCHAR_MAMEKEY(0_PAD))
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_1_PAD)        PORT_CHAR(UCHAR_MAMEKEY(1_PAD))
	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_3_PAD)        PORT_CHAR(UCHAR_MAMEKEY(3_PAD))
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_4_PAD)        PORT_CHAR(UCHAR_MAMEKEY(4_PAD))

	PORT_START("KEYA")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_5_PAD)        PORT_CHAR(UCHAR_MAMEKEY(5_PAD))
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_6_PAD)        PORT_CHAR(UCHAR_MAMEKEY(6_PAD))
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_7_PAD)        PORT_CHAR(UCHAR_MAMEKEY(7_PAD))
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_8_PAD)        PORT_CHAR(UCHAR_MAMEKEY(8_PAD))
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_9_PAD)        PORT_CHAR(UCHAR_MAMEKEY(9_PAD))
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_MINUS_PAD)    PORT_CHAR(UCHAR_MAMEKEY(MINUS_PAD))
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_ENTER_PAD)    PORT_CHAR(UCHAR_MAMEKEY(COMMA_PAD))
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_DEL_PAD)      PORT_CHAR(UCHAR_MAMEKEY(DEL_PAD))

	PORT_START("UNUSED")
	PORT_BIT(0xff, IP_ACTIVE_LOW, IPT_UNUSED)
INPUT_PORTS_END


void a5105_state::machine_reset()
{
	address_space &space = m_maincpu->space(AS_PROGRAM);
	a5105_ab_w(space, 0, 9); // turn motor off

	m_ram_base = (uint8_t*)m_ram->pointer();
	m_rom_base = (uint8_t*)memregion("maincpu")->base();

	membank("bank1")->set_base(m_rom_base);
	membank("bank2")->set_base(m_rom_base + 0x4000);
	membank("bank3")->set_base(m_ram_base);
	membank("bank4")->set_base(m_ram_base + 0x4000);
}


static const gfx_layout a5105_chars_8x8 =
{
	8,8,
	RGN_FRAC(1,1),
	1,
	{ 0 },
	{ 7, 6, 5, 4, 3, 2, 1, 0 },
	{ 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8 },
	8*8
};

static GFXDECODE_START( gfx_a5105 )
	GFXDECODE_ENTRY( "pcg", 0x0000, a5105_chars_8x8, 0, 8 )
GFXDECODE_END


PALETTE_INIT_MEMBER(a5105_state, a5105)
{
	int i;
	int r,g,b;

	for ( i = 0; i < 16; i++ )
	{
		r = i & 4 ? ((i & 8) ? 0xaa : 0xff) : 0x00;
		g = i & 2 ? ((i & 8) ? 0xaa : 0xff) : 0x00;
		b = i & 1 ? ((i & 8) ? 0xaa : 0xff) : 0x00;

		palette.set_pen_color(i, rgb_t(r,g,b));
	}
}

void a5105_state::video_start()
{
	// find memory regions
	m_char_ram = memregion("pcg")->base();
}

void a5105_state::upd7220_map(address_map &map)
{
	map.global_mask(0x1ffff);
	map(0x00000, 0x1ffff).ram().share("video_ram");
}

FLOPPY_FORMATS_MEMBER( a5105_state::floppy_formats )
	FLOPPY_A5105_FORMAT
FLOPPY_FORMATS_END

static void a5105_floppies(device_slot_interface &device)
{
	device.option_add("525qd", FLOPPY_525_QD);
}

static const z80_daisy_config a5105_daisy_chain[] =
{
	{ "z80ctc" },
	{ "z80pio" },
	{ nullptr }
};

MACHINE_CONFIG_START(a5105_state::a5105)
	/* basic machine hardware */
	MCFG_DEVICE_ADD("maincpu",Z80, XTAL(15'000'000) / 4)
	MCFG_DEVICE_PROGRAM_MAP(a5105_mem)
	MCFG_DEVICE_IO_MAP(a5105_io)
	MCFG_Z80_DAISY_CHAIN(a5105_daisy_chain)

	/* video hardware */
	MCFG_SCREEN_ADD("screen", RASTER)
	MCFG_SCREEN_REFRESH_RATE(50)
	MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500)) /* not accurate */
	MCFG_SCREEN_UPDATE_DEVICE("upd7220", upd7220_device, screen_update)
	MCFG_SCREEN_SIZE(40*8, 32*8)
	MCFG_SCREEN_VISIBLE_AREA(0, 40*8-1, 0, 25*8-1)
	MCFG_DEVICE_ADD("gfxdecode", GFXDECODE, "palette", gfx_a5105)
	MCFG_PALETTE_ADD("palette", 16)
	MCFG_PALETTE_INIT_OWNER(a5105_state, a5105)

	/* sound hardware */
	SPEAKER(config, "mono").front_center();
	WAVE(config, "wave", "cassette").add_route(ALL_OUTPUTS, "mono", 0.25);
	BEEP(config, "beeper", 500).add_route(ALL_OUTPUTS, "mono", 0.50);

	/* Devices */
	MCFG_DEVICE_ADD("upd7220", UPD7220, XTAL(15'000'000) / 16) // unk clock
	MCFG_DEVICE_ADDRESS_MAP(0, upd7220_map)
	MCFG_UPD7220_DISPLAY_PIXELS_CALLBACK_OWNER(a5105_state, hgdc_display_pixels)
	MCFG_UPD7220_DRAW_TEXT_CALLBACK_OWNER(a5105_state, hgdc_draw_text)

	MCFG_DEVICE_ADD("z80ctc", Z80CTC, XTAL(15'000'000) / 4)
	MCFG_Z80CTC_INTR_CB(INPUTLINE("maincpu", 0))
	MCFG_Z80CTC_ZC0_CB(WRITELINE("z80ctc", z80ctc_device, trg2))
	MCFG_Z80CTC_ZC2_CB(WRITELINE("z80ctc", z80ctc_device, trg3))

	MCFG_DEVICE_ADD("z80pio", Z80PIO, XTAL(15'000'000) / 4)
	MCFG_Z80PIO_OUT_INT_CB(INPUTLINE("maincpu", 0))

	MCFG_CASSETTE_ADD( "cassette" )

	MCFG_UPD765A_ADD("upd765a", true, true)
	MCFG_FLOPPY_DRIVE_ADD("upd765a:0", a5105_floppies, "525qd", a5105_state::floppy_formats)
	MCFG_FLOPPY_DRIVE_ADD("upd765a:1", a5105_floppies, "525qd", a5105_state::floppy_formats)
	MCFG_FLOPPY_DRIVE_ADD("upd765a:2", a5105_floppies, "525qd", a5105_state::floppy_formats)
	MCFG_FLOPPY_DRIVE_ADD("upd765a:3", a5105_floppies, "525qd", a5105_state::floppy_formats)

	/* internal ram */
	MCFG_RAM_ADD(RAM_TAG)
	MCFG_RAM_DEFAULT_SIZE("64K")
MACHINE_CONFIG_END

/* ROM definition */
ROM_START( a5105 )
	ROM_REGION( 0x10000, "maincpu", ROMREGION_ERASEFF )
	ROM_LOAD( "k1505_00.rom", 0x0000, 0x8000, CRC(0ed5f556) SHA1(5c33139db9f59e50da5c76729752f8e653ae34ae))
	ROM_LOAD( "k1505_80.rom", 0x8000, 0x2000, CRC(350e4958) SHA1(7e5b587c59676e8549561117ea0b70234f439a94))

	ROM_REGION( 0x800, "pcg", ROMREGION_ERASE00 )

	ROM_REGION( 0x4000, "k5651", ROMREGION_ERASEFF )
	ROM_LOAD( "k5651_40.rom", 0x0000, 0x2000, CRC(f4ad4739) SHA1(9a7bbe6f0d180dd513c7854f441cee986c8d9765))
	ROM_LOAD( "k5651_60.rom", 0x2000, 0x2000, CRC(c77dde3f) SHA1(7c16226be6c4c71013e8008fba9d2e9c5640b6a7))
ROM_END

/* Driver */

//    YEAR  NAME   PARENT  COMPAT  MACHINE  INPUT  CLASS        INIT        COMPANY         FULLNAME     FLAGS
COMP( 1989, a5105, 0,      0,      a5105,   a5105, a5105_state, empty_init, "VEB Robotron", "BIC A5105", MACHINE_NOT_WORKING | MACHINE_NO_SOUND)