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// license:BSD-3-Clause
// copyright-holders:hap
/******************************************************************************
Sun Electronics / Gifu Tokki G.T. Block Challenger
(is "G.T." Gifu Tokki or an indication of table cabinet type like Taito with T.T.?)
Hardware notes:
- NEC 8080A @ 2MHz (18MHz XTAL, 8224 clock divider)
- NEC 8228, 2*NEC 8255C
- 4KB ROM (4*MB8518)
- 256 bytes SRAM(2*MB8101), 1KB SRAM(2*M58754S)
- 1bpp bitmap + ball sprite, paddle sprite
- discrete sound
- 15 switches (not the usual small dipswitches, but separate large switches)
TV Game 8080 hardware is pretty much the same, but on a completely different
cheaper looking PCB. It has 13 switches instead of 15.
TODO:
- missing paddle position read (or maybe ball vs paddle collision detection)
- interrupts are wrong, it looks like it expects IN.2 0x40 to be low for a while before the 2nd irq
- is mirror(0x08) on the PPIs correct? it reads from 0x1c what may be paddle related too
- video timing is wrong
- identify remaining switches
- the flyer photo shows a green screen, assumed to be an overlay on a B&W CRT
- sound emulation
- verify tvgm8080 title, the only reference is from the instruction card which said: TV.GAME -8080-
******************************************************************************/
#include "emu.h"
#include "cpu/i8085/i8085.h"
#include "machine/i8255.h"
#include "screen.h"
#include "blockch.lh"
namespace {
class blockch_state : public driver_device
{
public:
blockch_state(const machine_config &mconfig, device_type type, const char *tag) :
driver_device(mconfig, type, tag),
m_maincpu(*this, "maincpu"),
m_ppi(*this, "ppi%u", 0),
m_screen(*this, "screen"),
m_vram(*this, "vram"),
m_inputs(*this, "IN.%u", 0)
{ }
// machine configs
void blockch(machine_config &config);
protected:
virtual void machine_start() override;
private:
// devices/pointers
required_device<cpu_device> m_maincpu;
required_device_array<i8255_device, 2> m_ppi;
required_device<screen_device> m_screen;
required_shared_ptr<u8> m_vram;
required_ioport_array<4> m_inputs;
void main_map(address_map &map);
void io_map(address_map &map);
u32 screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect);
DECLARE_WRITE_LINE_MEMBER(vblank_irq);
void ppi0_c_w(u8 data);
void ppi1_a_w(u8 data);
void ppi1_b_w(u8 data);
void ppi1_c_w(u8 data);
int m_ball_x = 0;
int m_ball_y = 0;
};
void blockch_state::machine_start()
{
save_item(NAME(m_ball_x));
save_item(NAME(m_ball_y));
}
/******************************************************************************
Video
******************************************************************************/
u32 blockch_state::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
{
// 96x64 background
for (int y = cliprect.min_y; y <= cliprect.max_y; y++)
{
for (int x = cliprect.min_x; x <= cliprect.max_x; x++)
{
// VRAM is only 1-bit
int pixel = m_vram[(x << 4 & 0x1fc0) | (y >> 2 & 0x3f)] & 1;
bitmap.pix(y, x) = pixel ? rgb_t::white() : rgb_t::black();
}
}
// draw ball sprite
int bx = 0x200 - m_ball_x - 2;
int by = 0x100 - m_ball_y;
for (int y = by; y < (by + 4); y++)
for (int x = bx; x < (bx + 4); x++)
if (cliprect.contains(x, y))
bitmap.pix(y, x) = rgb_t::white();
// draw paddle
// TODO: preliminary
int py = m_inputs[3]->read();
int px[2] = { 186, 46 };
for (int y = py; y < (py + 20); y++)
for (int i = 0; i < 2; i++)
for (int x = px[i]; x < (px[i] + 2); x++)
if (cliprect.contains(x, y))
bitmap.pix(y, x) = rgb_t::white();
return 0;
}
/******************************************************************************
I/O
******************************************************************************/
WRITE_LINE_MEMBER(blockch_state::vblank_irq)
{
m_maincpu->set_input_line(0, HOLD_LINE);
}
void blockch_state::ppi0_c_w(u8 data)
{
// sound?
}
void blockch_state::ppi1_a_w(u8 data)
{
m_ball_y = data;
}
void blockch_state::ppi1_b_w(u8 data)
{
m_ball_x = (m_ball_x & 0xf00) | data;
}
void blockch_state::ppi1_c_w(u8 data)
{
m_ball_x = (m_ball_x & 0xff) | (data << 8 & 0xf00);
}
/******************************************************************************
Address Maps
******************************************************************************/
void blockch_state::main_map(address_map &map)
{
map(0x0000, 0x0fff).mirror(0x1000).rom();
map(0x2000, 0x20ff).ram();
map(0x8000, 0x9fff).writeonly().share("vram");
}
void blockch_state::io_map(address_map &map)
{
map(0x10, 0x13).mirror(0x08).rw(m_ppi[0], FUNC(i8255_device::read), FUNC(i8255_device::write));
map(0x14, 0x17).mirror(0x08).rw(m_ppi[1], FUNC(i8255_device::read), FUNC(i8255_device::write));
}
/******************************************************************************
Input Ports
******************************************************************************/
static INPUT_PORTS_START( blockch )
PORT_START("IN.0")
PORT_DIPNAME( 0x03, 0x01, DEF_STR( Lives ) )
PORT_DIPSETTING( 0x00, "3" )
PORT_DIPSETTING( 0x01, "5" )
PORT_DIPSETTING( 0x02, "7" )
PORT_DIPSETTING( 0x03, "9")
PORT_DIPNAME( 0x04, 0x00, "Unknown 0_04" )
PORT_DIPSETTING( 0x00, DEF_STR( Off ) )
PORT_DIPSETTING( 0x04, DEF_STR( On ) )
PORT_DIPNAME( 0x08, 0x08, DEF_STR( Coinage ) )
PORT_DIPSETTING( 0x08, DEF_STR( 1C_1C ) )
PORT_DIPSETTING( 0x00, DEF_STR( 1C_2C ) )
PORT_DIPNAME( 0x10, 0x00, "Unknown 0_10" )
PORT_DIPSETTING( 0x00, DEF_STR( Off ) )
PORT_DIPSETTING( 0x10, DEF_STR( On ) )
PORT_DIPNAME( 0x20, 0x00, "Unknown 0_20" )
PORT_DIPSETTING( 0x00, DEF_STR( Off ) )
PORT_DIPSETTING( 0x20, DEF_STR( On ) )
PORT_DIPNAME( 0x40, 0x00, "Unknown 0_40" )
PORT_DIPSETTING( 0x00, DEF_STR( Off ) )
PORT_DIPSETTING( 0x40, DEF_STR( On ) )
PORT_DIPNAME( 0x80, 0x00, "Unknown 0_80" )
PORT_DIPSETTING( 0x00, DEF_STR( Off ) )
PORT_DIPSETTING( 0x80, DEF_STR( On ) )
PORT_START("IN.1")
PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_BUTTON1 )
PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_START1 )
PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_START2 )
PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_COIN1 )
PORT_DIPNAME( 0x10, 0x00, "Unknown 1_10" )
PORT_DIPSETTING( 0x00, DEF_STR( Off ) )
PORT_DIPSETTING( 0x10, DEF_STR( On ) )
PORT_DIPNAME( 0x20, 0x00, "Barriers" )
PORT_DIPSETTING( 0x20, DEF_STR( Off ) )
PORT_DIPSETTING( 0x00, DEF_STR( On ) )
PORT_DIPNAME( 0x40, 0x00, "Unknown 1_40" )
PORT_DIPSETTING( 0x00, DEF_STR( Off ) )
PORT_DIPSETTING( 0x40, DEF_STR( On ) )
PORT_DIPNAME( 0x80, 0x00, "Unknown 1_80" )
PORT_DIPSETTING( 0x00, DEF_STR( Off ) )
PORT_DIPSETTING( 0x80, DEF_STR( On ) )
PORT_START("IN.2")
PORT_BIT( 0x0f, IP_ACTIVE_HIGH, IPT_UNUSED )
PORT_DIPNAME( 0x10, 0x10, "Unknown 2_10" )
PORT_DIPSETTING( 0x00, DEF_STR( Off ) )
PORT_DIPSETTING( 0x10, DEF_STR( On ) )
PORT_DIPNAME( 0x20, 0x00, "Unknown 2_20" ) // collision related?
PORT_DIPSETTING( 0x00, DEF_STR( Off ) )
PORT_DIPSETTING( 0x20, DEF_STR( On ) )
PORT_BIT( 0x40, IP_ACTIVE_HIGH, IPT_CUSTOM ) PORT_VBLANK("screen")
PORT_DIPNAME( 0x80, 0x00, "Unknown 2_80" )
PORT_DIPSETTING( 0x00, DEF_STR( Off ) )
PORT_DIPSETTING( 0x80, DEF_STR( On ) )
PORT_START("IN.3")
PORT_BIT( 0xff, 0x00, IPT_PADDLE ) PORT_SENSITIVITY(40) PORT_KEYDELTA(10) PORT_CENTERDELTA(0)
INPUT_PORTS_END
/******************************************************************************
Machine Configs
******************************************************************************/
void blockch_state::blockch(machine_config &config)
{
/* basic machine hardware */
I8080A(config, m_maincpu, 18_MHz_XTAL/9);
m_maincpu->set_addrmap(AS_PROGRAM, &blockch_state::main_map);
m_maincpu->set_addrmap(AS_IO, &blockch_state::io_map);
I8255(config, m_ppi[0]); // 0x92: A & B = input, C = output
m_ppi[0]->in_pa_callback().set_ioport("IN.0");
m_ppi[0]->in_pb_callback().set_ioport("IN.1");
m_ppi[0]->out_pc_callback().set(FUNC(blockch_state::ppi0_c_w));
I8255(config, m_ppi[1]); // 0x88: A & B = output, Clow = output, Chigh = input
m_ppi[1]->out_pa_callback().set(FUNC(blockch_state::ppi1_a_w));
m_ppi[1]->out_pb_callback().set(FUNC(blockch_state::ppi1_b_w));
m_ppi[1]->out_pc_callback().set(FUNC(blockch_state::ppi1_c_w));
m_ppi[1]->in_pc_callback().set_ioport("IN.2");
/* video hardware */
SCREEN(config, m_screen, SCREEN_TYPE_RASTER);
m_screen->set_refresh_hz(60);
m_screen->set_size(512, 256);
m_screen->set_visarea(0, 384-1, 0, 256-1);
m_screen->set_vblank_time(ATTOSECONDS_IN_USEC(2500));
m_screen->set_screen_update(FUNC(blockch_state::screen_update));
m_screen->screen_vblank().set(FUNC(blockch_state::vblank_irq));
config.set_default_layout(layout_blockch);
/* sound hardware */
// TODO: discrete?
}
/******************************************************************************
ROM Definitions
******************************************************************************/
ROM_START( blockch )
ROM_REGION(0x10000, "maincpu", 0)
ROM_LOAD("1.62", 0x0000, 0x0400, CRC(94edc2dc) SHA1(3d3b9d996099aa82d2e9b3bed57fe1ce28971e8a))
ROM_LOAD("2.61", 0x0400, 0x0400, CRC(e29d4d60) SHA1(2766374286ed2a20c772e005bf45b4079c35acd5))
ROM_LOAD("3.60", 0x0800, 0x0400, CRC(9b15f0fc) SHA1(1ff965cfbccfdee7622f21b33e5a7e3d6292d0bb))
ROM_LOAD("4.59", 0x0c00, 0x0400, CRC(edf84910) SHA1(292aa16b5f23cae16c03fa7c0e711a5c2a04c27b))
ROM_END
ROM_START( tvgm8080 )
ROM_REGION(0x10000, "maincpu", 0)
ROM_LOAD("1", 0x0000, 0x0400, CRC(1665afec) SHA1(f4ce9d834a396962d86cf8afd3c2d06ee1709ab6))
ROM_LOAD("2", 0x0400, 0x0400, CRC(86314a5e) SHA1(b1cf040fceee99d6e192a3506ce71a7a82e426bc))
ROM_LOAD("3", 0x0800, 0x0400, CRC(7c8d1319) SHA1(37613d4b8e2da7e91d436015124f1ef37011f910))
ROM_LOAD("4", 0x0c00, 0x0400, CRC(bf3423a8) SHA1(acfe811e2c2a20a306b054e58b0a7493d5d90ba6))
ROM_END
} // anonymous namespace
/******************************************************************************
Drivers
******************************************************************************/
// YEAR NAME PARENT MACHINE INPUT CLASS INIT SCREEN COMPANY, FULLNAME, FLAGS
GAME( 1978, blockch, 0, blockch, blockch, blockch_state, empty_init, ROT270, "Sun Electronics / Gifu Tokki", "G.T. Block Challenger", MACHINE_NOT_WORKING | MACHINE_SUPPORTS_SAVE | MACHINE_NO_SOUND | MACHINE_IMPERFECT_GRAPHICS | MACHINE_NO_COCKTAIL )
GAME( 1978, tvgm8080, blockch, blockch, blockch, blockch_state, empty_init, ROT270, "bootleg?", "TV Game 8080", MACHINE_NOT_WORKING | MACHINE_SUPPORTS_SAVE | MACHINE_NO_SOUND | MACHINE_IMPERFECT_GRAPHICS | MACHINE_NO_COCKTAIL )
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