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path: root/src/mame/drivers/mz6500.cpp
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// license:BSD-3-Clause
// copyright-holders:Robbbert
/***************************************************************************

    Sharp MZ-6500



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

#include "emu.h"
#include "cpu/i86/i86.h"
#include "imagedev/floppy.h"
#include "machine/upd765.h"
#include "video/upd7220.h"
#include "emupal.h"
#include "screen.h"

class mz6500_state : public driver_device
{
public:
	mz6500_state(const machine_config &mconfig, device_type type, const char *tag)
		: driver_device(mconfig, type, tag),
		m_hgdc(*this, "upd7220"),
		m_fdc(*this, "upd765"),
		m_video_ram(*this, "video_ram"),
		m_maincpu(*this, "maincpu"),
		m_palette(*this, "palette") { }

	void mz6500(machine_config &config);

private:
	required_device<upd7220_device> m_hgdc;
	required_device<upd765a_device> m_fdc;
	DECLARE_READ8_MEMBER(mz6500_vram_r);
	DECLARE_WRITE8_MEMBER(mz6500_vram_w);
	void fdc_irq(bool state);
	void fdc_drq(bool state);
	required_shared_ptr<uint16_t> m_video_ram;
	virtual void machine_reset() override;
	virtual void video_start() override;
	required_device<cpu_device> m_maincpu;
	required_device<palette_device> m_palette;
	UPD7220_DISPLAY_PIXELS_MEMBER( hgdc_display_pixels );
	void mz6500_io(address_map &map);
	void mz6500_map(address_map &map);
	void upd7220_map(address_map &map);
};

UPD7220_DISPLAY_PIXELS_MEMBER( mz6500_state::hgdc_display_pixels )
{
	const rgb_t *palette = m_palette->palette()->entry_list_raw();
	int gfx[3];
	uint8_t i,pen;

	gfx[0] = m_video_ram[(address + 0x00000) >> 1];
	gfx[1] = m_video_ram[(address + 0x10000) >> 1];
	gfx[2] = m_video_ram[(address + 0x20000) >> 1];

	for(i=0; i<16; i++)
	{
		pen = (BIT(gfx[0], i)) | (BIT(gfx[1], i) << 1) | (BIT(gfx[2], i) << 2);

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


void mz6500_state::video_start()
{
}


READ8_MEMBER( mz6500_state::mz6500_vram_r )
{
	return m_video_ram[offset >> 1] >> ((offset & 1) ? 8 : 0);
}

WRITE8_MEMBER( mz6500_state::mz6500_vram_w )
{
	int mask = (offset & 1) ? 8 : 0;
	offset >>= 1;
	m_video_ram[offset] &= 0xff00 >> mask;
	m_video_ram[offset] |= data << mask;
}

void mz6500_state::mz6500_map(address_map &map)
{
	map.unmap_value_high();
	map(0x00000, 0x9ffff).ram();
//  map(0xa0000,0xbffff) kanji/dictionary ROM
	map(0xc0000, 0xeffff).rw(FUNC(mz6500_state::mz6500_vram_r), FUNC(mz6500_state::mz6500_vram_w));
	map(0xfc000, 0xfffff).rom().region("ipl", 0);
}

void mz6500_state::mz6500_io(address_map &map)
{
	map.unmap_value_high();
//  map(0x0000, 0x000f) i8237 dma
//  map(0x0010, 0x001f) i8255
	map(0x0020, 0x0021).mirror(0xe).m(m_fdc, FUNC(upd765a_device::map));
//  map(0x0030, 0x003f) i8259 master
//  map(0x0040, 0x004f) i8259 slave
//  map(0x0050, 0x0050) segment byte for DMA
//  map(0x0060, 0x0060) system port A
//  map(0x0070, 0x0070) system port C
//  map(0x00cd, 0x00cd) MZ-1R32
	map(0x0100, 0x0103).mirror(0xc).rw(m_hgdc, FUNC(upd7220_device::read), FUNC(upd7220_device::write)).umask16(0x00ff);
//  map(0x0110, 0x011f) video address / data registers (priority)
//  map(0x0120, 0x012f) video registers
//  map(0x0130, 0x013f) video register
//  map(0x0140, 0x015f) palette pens
//  map(0x0200, 0x020f) z80sio
//  map(0x0210, 0x021f) z80ctc
//  map(0x0220, 0x022f) rp5c01
//  map(0x0230, 0x023f) ay-3-8912
//  map(0x0240, 0x0240) z80ctc vector ack
//  map(0x0250, 0x0250) z80sio vector ack
//  map(0x0270, 0x0270) system port B
}

/* Input ports */
static INPUT_PORTS_START( mz6500 )
INPUT_PORTS_END


void mz6500_state::machine_reset()
{
}

void mz6500_state::fdc_irq(bool state)
{
	//printf("%02x IRQ\n",state);
}

void mz6500_state::fdc_drq(bool state)
{
	//printf("%02x DRQ\n",state);
}

static void mz6500_floppies(device_slot_interface &device)
{
	device.option_add("525hd", FLOPPY_525_HD);
}

void mz6500_state::upd7220_map(address_map &map)
{
	map(0x00000, 0x3ffff).ram().share("video_ram");
}


void mz6500_state::mz6500(machine_config &config)
{
	/* basic machine hardware */
	I8086(config, m_maincpu, 8000000); //unk clock
	m_maincpu->set_addrmap(AS_PROGRAM, &mz6500_state::mz6500_map);
	m_maincpu->set_addrmap(AS_IO, &mz6500_state::mz6500_io);


	/* video hardware */
	screen_device &screen(SCREEN(config, "screen", SCREEN_TYPE_RASTER));
	screen.set_refresh_hz(50);
	screen.set_vblank_time(ATTOSECONDS_IN_USEC(2500)); /* not accurate */
	screen.set_screen_update("upd7220", FUNC(upd7220_device::screen_update));
	screen.set_size(640, 480);
	screen.set_visarea(0, 640-1, 0, 480-1);
	PALETTE(config, "palette").set_entries(8);

	/* Devices */
	UPD7220(config, m_hgdc, 8000000/6); // unk clock
	m_hgdc->set_addrmap(0, &mz6500_state::upd7220_map);
	m_hgdc->set_display_pixels(FUNC(mz6500_state::hgdc_display_pixels));

	UPD765A(config, m_fdc, 8000000, true, true);
	FLOPPY_CONNECTOR(config, "upd765:0", mz6500_floppies, "525hd", floppy_image_device::default_floppy_formats);
	FLOPPY_CONNECTOR(config, "upd765:1", mz6500_floppies, "525hd", floppy_image_device::default_floppy_formats);
}

/* ROM definition */
ROM_START( mz6500 )
	ROM_REGION( 0x4000, "ipl", ROMREGION_ERASEFF )
	ROM_LOAD( "ipl.rom", 0x0000, 0x4000,CRC(6c978ac4) SHA1(7872d7e6d9cda2ed9f47ed4833a5caa4dfe0e55c))

	ROM_REGION( 0x40000, "dictionary", ROMREGION_ERASEFF )
	ROM_LOAD( "dict.rom", 0x0000, 0x40000, CRC(2df3cfd3) SHA1(d420ede09658c2626b0bb650a063d88b1783e554))

	ROM_REGION( 0x40000, "kanji", ROMREGION_ERASEFF )
	ROM_LOAD( "kanji.rom", 0x0000, 0x40000, CRC(b618e25d) SHA1(1da93337fecde6c0f8a5bd68f3f0b3222a38d63e))
ROM_END

/* Driver */

//    YEAR  NAME    PARENT  COMPAT  MACHINE  INPUT   CLASS         INIT        COMPANY  FULLNAME   FLAGS
COMP( 198?, mz6500, 0,      0,      mz6500,  mz6500, mz6500_state, empty_init, "Sharp", "MZ-6500", MACHINE_NOT_WORKING | MACHINE_NO_SOUND)