/
minivadr.cpp
144 lines (111 loc) · 3.81 KB
/
minivadr.cpp
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// license:BSD-3-Clause
// copyright-holders:Takahiro Nogi
/***************************************************************************
Mini Vaders (Space Invaders's mini game)
(c)1990 Taito Corporation
Driver by Takahiro Nogi 1999/12/19 -
This is a test board sold together with the cabinet (as required by law in
Japan). It has no sound.
PCB Layout
----------
K11X0622A
MINI VADERS
|-------------------------|
|MB3771 24MHz |
|LS32 74F74 |
|LS139 |
|D26_01.IC7 LS244 J|
|Z80 LS244 A|
|LS86 LS08 LS373 M|
|LS157 LS157 LS161 LS161 M|
|LS157 LS157 LS161 LS161 A|
|6116 LS157 LS08 |
|LS74 LS74 LS74 LS157 |
|-------------------------|
Notes: (all ICs shown)
Z80 - Clock 4MHz [24/6]
6116 - 2Kbx8 SRAM
D26_01.IC7 - 27C64 8Kbx8 EPROM
***************************************************************************/
#include "emu.h"
#include "cpu/z80/z80.h"
#include "screen.h"
namespace {
class minivadr_state : public driver_device
{
public:
minivadr_state(const machine_config &mconfig, device_type type, const char *tag)
: driver_device(mconfig, type, tag),
m_videoram(*this, "videoram"),
m_maincpu(*this, "maincpu") { }
void minivadr(machine_config &config);
private:
/* memory pointers */
required_shared_ptr<uint8_t> m_videoram;
uint32_t screen_update_minivadr(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect);
required_device<cpu_device> m_maincpu;
void minivadr_map(address_map &map);
};
/*************************************
*
* Video update
*
*************************************/
uint32_t minivadr_state::screen_update_minivadr(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
{
for (offs_t offs = 0; offs < m_videoram.bytes(); offs++)
{
uint8_t x = offs << 3;
const int y = offs >> 5;
uint8_t data = m_videoram[offs];
for (int i = 0; i < 8; i++)
{
pen_t pen = (data & 0x80) ? rgb_t::white() : rgb_t::black();
bitmap.pix(y, x) = pen;
data <<= 1;
x++;
}
}
return 0;
}
void minivadr_state::minivadr_map(address_map &map)
{
map(0x0000, 0x1fff).rom();
map(0xa000, 0xbfff).ram().share("videoram");
map(0xe008, 0xe008).portr("INPUTS").nopw(); // W - ???
}
static INPUT_PORTS_START( minivadr )
PORT_START("INPUTS")
PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT )
PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT )
PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_BUTTON1 )
PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_COIN1 )
PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_UNKNOWN )
PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_UNKNOWN )
PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_UNKNOWN )
PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_UNKNOWN )
INPUT_PORTS_END
void minivadr_state::minivadr(machine_config &config)
{
/* basic machine hardware */
Z80(config, m_maincpu, XTAL(24'000'000) / 6);
m_maincpu->set_addrmap(AS_PROGRAM, &minivadr_state::minivadr_map);
m_maincpu->set_vblank_int("screen", FUNC(minivadr_state::irq0_line_hold));
/* video hardware */
screen_device &screen(SCREEN(config, "screen", SCREEN_TYPE_RASTER));
screen.set_refresh_hz(60);
screen.set_vblank_time(ATTOSECONDS_IN_USEC(0));
screen.set_size(256, 256);
screen.set_visarea(0, 256-1, 16, 240-1);
screen.set_screen_update(FUNC(minivadr_state::screen_update_minivadr));
/* the board has no sound hardware */
}
/***************************************************************************
Game driver(s)
***************************************************************************/
ROM_START( minivadr )
ROM_REGION( 0x10000, "maincpu", 0 )
ROM_LOAD( "d26-01.ic7", 0x0000, 0x2000, CRC(a96c823d) SHA1(aa9969ff80e94b0fff0f3530863f6b300510162e) )
ROM_END
} // anonymous namespace
GAME( 1990, minivadr, 0, minivadr, minivadr, minivadr_state, empty_init, ROT0, "Taito Corporation", "Mini Vaders", MACHINE_SUPPORTS_SAVE | MACHINE_NO_SOUND_HW )