summaryrefslogtreecommitdiffstatshomepage
path: root/src/mame/drivers/minivadr.c
blob: 780959845f5708fb94254cfa2396ed6443d8dc85 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
// license:BSD-3-Clause
// copyright-holders:Takahiro Nogi
/***************************************************************************

Mini Vaders (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.

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"


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") { }

	/* memory pointers */
	required_shared_ptr<UINT8> m_videoram;
	UINT32 screen_update_minivadr(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect);
	required_device<cpu_device> m_maincpu;
};

/*************************************
 *
 *  Video update
 *
 *************************************/

UINT32 minivadr_state::screen_update_minivadr(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
{
	offs_t offs;

	for (offs = 0; offs < m_videoram.bytes(); offs++)
	{
		int i;

		UINT8 x = offs << 3;
		int y = offs >> 5;
		UINT8 data = m_videoram[offs];

		for (i = 0; i < 8; i++)
		{
			pen_t pen = (data & 0x80) ? rgb_t::white : rgb_t::black;
			bitmap.pix32(y, x) = pen;

			data = data << 1;
			x = x + 1;
		}
	}

	return 0;
}


static ADDRESS_MAP_START( minivadr_map, AS_PROGRAM, 8, minivadr_state )
	AM_RANGE(0x0000, 0x1fff) AM_ROM
	AM_RANGE(0xa000, 0xbfff) AM_RAM AM_SHARE("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_CONFIG_START( minivadr, minivadr_state )

	/* basic machine hardware */
	MCFG_CPU_ADD("maincpu", Z80,24000000 / 6)        /* 4 MHz ? */
	MCFG_CPU_PROGRAM_MAP(minivadr_map)
	MCFG_CPU_VBLANK_INT_DRIVER("screen", minivadr_state,  irq0_line_hold)

	/* video hardware */
	MCFG_SCREEN_ADD("screen", RASTER)
	MCFG_SCREEN_REFRESH_RATE(60)
	MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(0))
	MCFG_SCREEN_SIZE(256, 256)
	MCFG_SCREEN_VISIBLE_AREA(0, 256-1, 16, 240-1)
	MCFG_SCREEN_UPDATE_DRIVER(minivadr_state, screen_update_minivadr)

	/* the board has no sound hardware */
MACHINE_CONFIG_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, driver_device, 0, ROT0, "Taito Corporation", "Mini Vaders", MACHINE_SUPPORTS_SAVE | MACHINE_NO_SOUND_HW )