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/***************************************************************************
Minivader (Space Invaders's mini game)
(c)1990 Taito Corporation
Driver by Takahiro Nogi (nogi@kt.rim.or.jp) 1999/12/19 -
This is a test board sold together with the cabinet (as required by law in
Japan). It has no sound.
***************************************************************************/
#include "emu.h"
#include "cpu/z80/z80.h"
/*************************************
*
* Video update
*
*************************************/
static VIDEO_UPDATE( minivadr )
{
offs_t offs;
for (offs = 0; offs < screen->machine->generic.videoram_size; offs++)
{
int i;
UINT8 x = offs << 3;
int y = offs >> 5;
UINT8 data = screen->machine->generic.videoram.u8[offs];
for (i = 0; i < 8; i++)
{
pen_t pen = (data & 0x80) ? RGB_WHITE : RGB_BLACK;
*BITMAP_ADDR32(bitmap, y, x) = pen;
data = data << 1;
x = x + 1;
}
}
return 0;
}
static ADDRESS_MAP_START( minivadr_map, ADDRESS_SPACE_PROGRAM, 8 )
AM_RANGE(0x0000, 0x1fff) AM_ROM
AM_RANGE(0xa000, 0xbfff) AM_RAM AM_BASE_GENERIC(videoram) AM_SIZE_GENERIC(videoram)
AM_RANGE(0xe008, 0xe008) AM_READ_PORT("INPUTS") AM_WRITENOP // W - ???
ADDRESS_MAP_END
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
static MACHINE_DRIVER_START( minivadr )
/* basic machine hardware */
MDRV_CPU_ADD("maincpu", Z80,24000000 / 6) /* 4 MHz ? */
MDRV_CPU_PROGRAM_MAP(minivadr_map)
MDRV_CPU_VBLANK_INT("screen", irq0_line_hold)
/* video hardware */
MDRV_SCREEN_ADD("screen", RASTER)
MDRV_SCREEN_REFRESH_RATE(60)
MDRV_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(0))
MDRV_SCREEN_FORMAT(BITMAP_FORMAT_RGB32)
MDRV_SCREEN_SIZE(256, 256)
MDRV_SCREEN_VISIBLE_AREA(0, 256-1, 16, 240-1)
MDRV_VIDEO_UPDATE(minivadr)
/* the board has no sound hardware */
MACHINE_DRIVER_END
/***************************************************************************
Game driver(s)
***************************************************************************/
ROM_START( minivadr )
ROM_REGION( 0x10000, "maincpu", 0 )
ROM_LOAD( "d26-01.bin", 0x0000, 0x2000, CRC(a96c823d) SHA1(aa9969ff80e94b0fff0f3530863f6b300510162e) )
ROM_END
GAME( 1990, minivadr, 0, minivadr, minivadr, 0, ROT0, "Taito Corporation", "Minivader", GAME_SUPPORTS_SAVE )
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