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Initial 40x25 monochrom text-mode video emulation for the Itautec I-7000 computer.

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This commit is contained in:
Felipe Corrêa da Silva Sanches 2015-06-10 02:17:11 -03:00
parent bbe27d0884
commit 038c9ddde3
1 changed files with 82 additions and 4 deletions
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86
src/mess/drivers/i7000.c
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@ -51,15 +51,22 @@ class i7000_state : public driver_device
public:
i7000_state(const machine_config &mconfig, device_type type, const char *tag)
: driver_device(mconfig, type, tag),
m_card(*this, "cardslot")
{ }
m_card(*this, "cardslot"),
m_videoram(*this, "videoram")
{ }
virtual void video_start();
required_device<generic_slot_device> m_card;
required_shared_ptr<UINT8> m_videoram;
UINT32 screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
UINT8 *m_char_rom;
// DECLARE_READ8_MEMBER( i7000_io_r );
// DECLARE_WRITE8_MEMBER( i7000_io_w );
DECLARE_DRIVER_INIT(i7000);
DECLARE_PALETTE_INIT(i7000);
DECLARE_DEVICE_IMAGE_LOAD_MEMBER( i7000_card );
};
@ -67,11 +74,49 @@ DRIVER_INIT_MEMBER(i7000_state, i7000)
{
}
PALETTE_INIT_MEMBER(i7000_state, i7000)
{
palette.set_pen_color(0, rgb_t(0x33, 0x33, 0x33));
palette.set_pen_color(1, rgb_t(0xBB, 0xBB, 0xBB));
}
void i7000_state::video_start()
{
// find memory regions
m_char_rom = memregion("gfx1")->base();
}
UINT32 i7000_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
offs_t addr = 0;
for (int sy = 0; sy < 25; sy++)
{
for (int sx = 0; sx < 40; sx++)
{
UINT8 data = m_videoram[addr++];
for (int y = 0; y < 8; y++)
{
int color = m_char_rom[data*8 + y];
for (int x = 0; x < 8; x++)
{
bitmap.pix16(sy*8 + y, sx*8 + 7 - x) = (color & 1);
color >>= 1;
}
}
}
}
return 0;
}
/*FIXME: we still need to figure out the proper memory map
for the maincpu and where the cartridge slot maps to. */
static ADDRESS_MAP_START(i7000_mem, AS_PROGRAM, 8, i7000_state)
/* guessed */ AM_RANGE(0x0000, 0x0fff) AM_ROM AM_REGION("maincpu", 0)
/* guessed */ AM_RANGE(0x1000, 0xffff) AM_RAM
AM_RANGE(0x0000, 0x0fff) AM_ROM AM_REGION("maincpu", 0)
AM_RANGE(0x1000, 0x1fff) AM_RAM
AM_RANGE(0x2000, 0xffff) AM_RAM AM_SHARE("videoram")
// AM_RANGE(0x8000, 0xffff) AM_ROM AM_REGION("cardslot", 0)
ADDRESS_MAP_END
/*
@ -92,6 +137,25 @@ DEVICE_IMAGE_LOAD_MEMBER( i7000_state, i7000_card )
return IMAGE_INIT_PASS;
}
#if 0
static const gfx_layout i7000_charlayout =
{
8, 8, /* 8 x 8 characters */
256, /* 256 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 /* every char takes 8 bytes */
};
static GFXDECODE_START( i7000 )
GFXDECODE_ENTRY( "gfx1", 0x0000, i7000_charlayout, 0, 8 )
GFXDECODE_END
#endif
static MACHINE_CONFIG_START( i7000, i7000_state )
/* basic machine hardware */
@ -99,6 +163,20 @@ static MACHINE_CONFIG_START( i7000, i7000_state )
MCFG_CPU_PROGRAM_MAP(i7000_mem)
// MCFG_CPU_IO_MAP(i7000_io)
/* video hardware */
MCFG_SCREEN_ADD("screen", RASTER)
MCFG_SCREEN_REFRESH_RATE(60)
MCFG_SCREEN_SIZE(320, 200) /* 40x25 8x8 chars */
MCFG_SCREEN_VISIBLE_AREA(0, 320-1, 0, 200-1)
MCFG_SCREEN_UPDATE_DRIVER(i7000_state, screen_update)
MCFG_SCREEN_PALETTE("palette")
MCFG_PALETTE_ADD("palette", 2)
MCFG_PALETTE_INIT_OWNER(i7000_state, i7000)
// MCFG_GFXDECODE_ADD("gfxdecode", "palette", i7000)
/* Cartridge slot */
MCFG_GENERIC_CARTSLOT_ADD("cardslot", generic_romram_plain_slot, "i7000_card")
MCFG_GENERIC_EXTENSIONS("rom")