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path: root/src/mess/drivers/mbc200.c
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/***************************************************************************

        Sanyo MBC-200

        Machine MBC-1200 is identicaly but sold outside of Japan

        16 x HM6116P-3 2K x 8 SRAM soldered onboard (so 32k ram)
        4 x HM6116P-3 2K x 8 SRAM socketed (so 8k ram)
        4 x MB83256 32K x 8 socketed (128k ram)
        Dual 5.25" floppies.

        On back side:
            - keyboard DIN connector
            - Centronics printer port
            - RS-232C 25pin connector

        TODO:
        - Master-Slave hand-shaking thru PPI8255 doesn't work properly
          (checks if bit 7 is high on master side, you appaently can't do
           that with current core(s)), kludged to work for now.

        31/10/2011 Skeleton driver.

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

#include "emu.h"
#include "cpu/z80/z80.h"
#include "machine/i8255.h"
#include "machine/i8251.h"
#include "video/mc6845.h"
#include "machine/wd17xx.h"
#include "formats/basicdsk.h"
#include "imagedev/flopdrv.h"

class mbc200_state : public driver_device
{
public:
	mbc200_state(const machine_config &mconfig, device_type type, const char *tag)
		: driver_device(mconfig, type, tag),
		m_6845(*this, "crtc"),
		m_fdc(*this, "fdc"),
		m_ppi(*this, "ppi8255_2"),
		m_floppy0(*this, FLOPPY_0),
		m_floppy1(*this, FLOPPY_1),
		m_vram(*this, "vram"),
		m_maincpu(*this, "maincpu"),
		m_palette(*this, "palette")  { }

	virtual void machine_start();

	required_device<mc6845_device> m_6845;
	required_device<mb8876_device> m_fdc;
	required_device<i8255_device> m_ppi;
	required_device<legacy_floppy_image_device> m_floppy0;
	required_device<legacy_floppy_image_device> m_floppy1;

	DECLARE_READ8_MEMBER(from_master_r);
	DECLARE_WRITE8_MEMBER(porta_w);
	DECLARE_READ8_MEMBER(ppi_hs_r);

	UINT8 m_hs_bit;
	UINT8 m_comm_latch;
	required_shared_ptr<UINT8> m_vram;

	virtual void video_start();
	UINT32 screen_update_mbc200(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
	required_device<cpu_device> m_maincpu;
	required_device<palette_device> m_palette;
};


static ADDRESS_MAP_START(mbc200_mem, AS_PROGRAM, 8, mbc200_state)
	ADDRESS_MAP_UNMAP_HIGH
	AM_RANGE( 0x0000, 0x0fff ) AM_ROM
	AM_RANGE( 0x1000, 0xffff ) AM_RAM
ADDRESS_MAP_END

READ8_MEMBER( mbc200_state::ppi_hs_r )
{
	return (m_ppi->read(space, 2) & 0x7f) | m_hs_bit;
}

static ADDRESS_MAP_START( mbc200_io , AS_IO, 8, mbc200_state)
	ADDRESS_MAP_UNMAP_HIGH
	ADDRESS_MAP_GLOBAL_MASK(0xff)
	AM_RANGE(0xe0, 0xe0) AM_DEVREADWRITE("i8251_1", i8251_device, data_r, data_w)
	AM_RANGE(0xe1, 0xe1) AM_DEVREADWRITE("i8251_1", i8251_device, status_r, control_w)
	AM_RANGE(0xe4, 0xe7) AM_DEVREADWRITE("fdc", mb8876_device, read, write)
	AM_RANGE(0xea, 0xea) AM_READ(ppi_hs_r)
	AM_RANGE(0xe8, 0xeb) AM_DEVREADWRITE("ppi8255_2", i8255_device, read, write)
	AM_RANGE(0xec, 0xec) AM_DEVREADWRITE("i8251_2", i8251_device, data_r, data_w)
	AM_RANGE(0xed, 0xed) AM_DEVREADWRITE("i8251_2", i8251_device, status_r, control_w)
ADDRESS_MAP_END



static ADDRESS_MAP_START(mbc200_sub_mem, AS_PROGRAM, 8, mbc200_state)
	ADDRESS_MAP_UNMAP_HIGH
	AM_RANGE( 0x0000, 0x2fff ) AM_ROM
	AM_RANGE( 0x3000, 0x7fff ) AM_RAM
	AM_RANGE( 0x8000, 0xffff ) AM_RAM AM_SHARE("vram")
ADDRESS_MAP_END

READ8_MEMBER(mbc200_state::from_master_r)
{
	UINT8 tmp;
	machine().scheduler().synchronize(); // force resync
	tmp = m_comm_latch;
	m_comm_latch = 0;
	m_hs_bit |= 0x80;
	return tmp;
}

static ADDRESS_MAP_START( mbc200_sub_io , AS_IO, 8, mbc200_state)
	ADDRESS_MAP_UNMAP_HIGH
	ADDRESS_MAP_GLOBAL_MASK(0xff)
	AM_RANGE(0x70, 0x73) AM_DEVREADWRITE("ppi8255_1", i8255_device, read, write)
	AM_RANGE(0xb0, 0xb0) AM_DEVWRITE("crtc", mc6845_device, address_w)
	AM_RANGE(0xb1, 0xb1) AM_DEVREADWRITE("crtc", mc6845_device, register_r, register_w)
//  AM_RANGE(0xd0, 0xd3) AM_DEVREADWRITE("ppi8255_2", i8255_device, read, write)
	AM_RANGE(0xd0, 0xd0) AM_READ(from_master_r)
ADDRESS_MAP_END

/* Input ports */
INPUT_PORTS_START( mbc200 )
INPUT_PORTS_END

void mbc200_state::machine_start()
{
	m_floppy0->floppy_mon_w(CLEAR_LINE);
	m_floppy1->floppy_mon_w(CLEAR_LINE);
	m_floppy0->floppy_drive_set_ready_state(1, 1);
	m_floppy1->floppy_drive_set_ready_state(1, 1);
}

void mbc200_state::video_start()
{
}

UINT32 mbc200_state::screen_update_mbc200(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
	int x,y,xi,yi;
	int count;

	count = 0;

	for(y=0;y<100;y++)
	{
		for(x=0;x<80;x++)
		{
			for(yi=0;yi<4;yi++)
			{
				for(xi=0;xi<8;xi++)
				{
					UINT8 dot;
					dot = (m_vram[count] >> (7-xi)) & 1;

					if(y*4+yi < 400 && x*8+xi < 640) /* TODO: safety check */
						bitmap.pix16(y*4+yi, x*8+xi) = m_palette->pen(dot);
				}

				count++;
			}
		}
	}

	return 0;
}

WRITE8_MEMBER( mbc200_state::porta_w )
{
	machine().scheduler().synchronize(); // force resync
	printf("A %02x %c\n",data,data);
	m_comm_latch = data; // to slave CPU
	m_hs_bit &= ~0x80;
}

static const floppy_interface mbc200_floppy_interface =
{
	FLOPPY_STANDARD_5_25_SSDD_40,
	LEGACY_FLOPPY_OPTIONS_NAME(default),
	"floppy_5_25"
};

static const gfx_layout mbc200_chars_8x8 =
{
	8,8,
	RGN_FRAC(1,1),
	1,
	{ 0 },
	{ 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
};

static GFXDECODE_START( mbc200 )
	GFXDECODE_ENTRY( "subcpu", 0x0000, mbc200_chars_8x8, 0, 4 )
GFXDECODE_END


static MACHINE_CONFIG_START( mbc200, mbc200_state )
	/* basic machine hardware */
	MCFG_CPU_ADD("maincpu",Z80, XTAL_8MHz/2) // NEC D780C-1
	MCFG_CPU_PROGRAM_MAP(mbc200_mem)
	MCFG_CPU_IO_MAP(mbc200_io)

	MCFG_CPU_ADD("subcpu",Z80, XTAL_8MHz/2) // NEC D780C-1
	MCFG_CPU_PROGRAM_MAP(mbc200_sub_mem)
	MCFG_CPU_IO_MAP(mbc200_sub_io)

	/* video hardware */
	MCFG_SCREEN_ADD("screen", RASTER)
	MCFG_SCREEN_REFRESH_RATE(50)
	MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500)) /* not accurate */
	MCFG_SCREEN_SIZE(640, 400)
	MCFG_SCREEN_VISIBLE_AREA(0, 640-1, 0, 400-1)
	MCFG_SCREEN_UPDATE_DRIVER(mbc200_state, screen_update_mbc200)
	MCFG_SCREEN_PALETTE("palette")

	MCFG_GFXDECODE_ADD("gfxdecode", "palette", mbc200)
	MCFG_PALETTE_ADD_BLACK_AND_WHITE("palette")

	MCFG_MC6845_ADD("crtc", H46505, "screen", XTAL_8MHz / 4) // HD46505SP
	MCFG_MC6845_SHOW_BORDER_AREA(false)
	MCFG_MC6845_CHAR_WIDTH(8)

	MCFG_DEVICE_ADD("ppi8255_1", I8255, 0)

	MCFG_DEVICE_ADD("ppi8255_2", I8255, 0)
	MCFG_I8255_OUT_PORTA_CB(WRITE8(mbc200_state, porta_w))

	MCFG_DEVICE_ADD("i8251_1", I8251, 0) // INS8251N
	MCFG_DEVICE_ADD("i8251_2", I8251, 0) // INS8251A

	MCFG_DEVICE_ADD("fdc", MB8876, 0) // MB8876A
	MCFG_WD17XX_DEFAULT_DRIVE2_TAGS

	MCFG_LEGACY_FLOPPY_2_DRIVES_ADD(mbc200_floppy_interface)
MACHINE_CONFIG_END

/* ROM definition */
ROM_START( mbc200 )
	ROM_REGION( 0x10000, "maincpu", ROMREGION_ERASEFF )
	ROM_LOAD( "d2732a.bin",  0x0000, 0x1000, CRC(bf364ce8) SHA1(baa3a20a5b01745a390ef16628dc18f8d682d63b))
	ROM_REGION( 0x10000, "subcpu", ROMREGION_ERASEFF )
	ROM_LOAD( "m5l2764.bin", 0x0000, 0x2000, CRC(377300a2) SHA1(8563172f9e7f84330378a8d179f4138be5fda099))
ROM_END

/* Driver */

/*    YEAR  NAME    PARENT  COMPAT   MACHINE    INPUT    INIT    COMPANY   FULLNAME       FLAGS */
COMP( 1982, mbc200,  0,       0,    mbc200,     mbc200, driver_device,   0,  "Sanyo",   "MBC-200",      GAME_NOT_WORKING | GAME_NO_SOUND)