summaryrefslogtreecommitdiffstatshomepage
path: root/src/mame/drivers/alinvade.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'src/mame/drivers/alinvade.cpp')
-rw-r--r--src/mame/drivers/alinvade.cpp248
1 files changed, 0 insertions, 248 deletions
diff --git a/src/mame/drivers/alinvade.cpp b/src/mame/drivers/alinvade.cpp
deleted file mode 100644
index a9138a1e94c..00000000000
--- a/src/mame/drivers/alinvade.cpp
+++ /dev/null
@@ -1,248 +0,0 @@
-// license:BSD-3-Clause
-// copyright-holders:David Haywood, Mariusz Wojcieszek
-/*
-
- tiny bartop b&w Space Invaders type game with colour overlay
-
- Driver by David Haywood and Mariusz Wojcieszek
-
- TODO:
- - 16 bytes are protected in the c*** range. I'm guessing they used a PROM to protect a
- simple sub-routine because:
- * It attempts to jsr from RAM to that area with a 0x10 byte offset (i.e. ROM copies a code snippet to RAM; when it executes
- it code executes jsr 0xc400 then self-modifies it to 0xc410, rinse and repeat ... up to 0xc7f0 and rolls back);
- * After that the program has an amusing left-over located at 0xe000-0xe00f (yup, NOPs + a RTS), with the
- exact same number of times as above;
- It's unknown at current stage what it really protects tho, game seems working for all I can see ... -AS
-
- - Sound is entirely guesswork.
-
- */
-
-#include "emu.h"
-#include "cpu/m6502/m6502.h"
-#include "sound/discrete.h"
-#include "screen.h"
-#include "speaker.h"
-
-#include "alinvade.lh"
-
-
-class alinvade_state : public driver_device
-{
-public:
- alinvade_state(const machine_config &mconfig, device_type type, const char *tag)
- : driver_device(mconfig, type, tag)
- , m_maincpu(*this, "maincpu")
- , m_videoram(*this, "videoram")
- , m_discrete(*this, "discrete")
- { }
-
- void alinvade(machine_config &config);
-
-private:
- DECLARE_READ8_MEMBER(irqmask_r);
- DECLARE_WRITE8_MEMBER(irqmask_w);
- DECLARE_WRITE8_MEMBER(sound_w);
- DECLARE_WRITE8_MEMBER(sounden_w);
- DECLARE_WRITE_LINE_MEMBER(vblank_irq);
- uint32_t screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect);
-
- void alinvade_map(address_map &map);
-
- uint8_t m_irqmask;
- uint8_t m_irqff;
- virtual void machine_start() override;
- virtual void machine_reset() override;
- required_device<cpu_device> m_maincpu;
- required_shared_ptr<uint8_t> m_videoram;
- required_device<discrete_device> m_discrete;
-};
-
-static const discrete_dac_r1_ladder alinvade_music_dac =
- {3, {0, RES_K(47), RES_K(12)}, 0, 0, 0, CAP_U(0.01)};
-
-#define ALINVADE_MUSIC_CLK (75000)
-
-DISCRETE_SOUND_START(alinvade_discrete)
- DISCRETE_INPUT_DATA (NODE_01)
-
- DISCRETE_NOTE(NODE_20, 1, ALINVADE_MUSIC_CLK, NODE_01, 255, 5, DISC_CLK_IS_FREQ)
-
- // Convert count to 7492 output
- DISCRETE_TRANSFORM2(NODE_21, NODE_20, 2, "01>0+")
-
- DISCRETE_DAC_R1(NODE_22, NODE_21, DEFAULT_TTL_V_LOGIC_1, &alinvade_music_dac)
-
- DISCRETE_CRFILTER(NODE_80, NODE_22, RES_K(10), CAP_U(0.1))
-
- DISCRETE_OUTPUT(NODE_80, 2500)
-
-DISCRETE_SOUND_END
-
-WRITE8_MEMBER( alinvade_state::sound_w )
-{
- m_discrete->write(NODE_01, (data^0x3f)<<2);
-}
-
-WRITE8_MEMBER( alinvade_state::sounden_w )
-{
- machine().sound().system_enable(data == 4);
-}
-
-READ8_MEMBER(alinvade_state::irqmask_r)
-{
- return 0; // TODO: might be anything
-}
-
-
-WRITE8_MEMBER(alinvade_state::irqmask_w)
-{
- if((!(m_irqff & 1)) && (data & 1)) // f/f, active high? If the above actually returns 0xff this could be active low ...
- m_irqmask^= 1;
-
- m_irqff = data;
-}
-
-void alinvade_state::alinvade_map(address_map &map)
-{
- map(0x0000, 0x01ff).ram();
- map(0x0400, 0x0bff).ram().share("videoram");
- map(0x0c00, 0x0dff).ram();
- map(0x2000, 0x2000).w(FUNC(alinvade_state::sound_w));
- map(0x4000, 0x4000).portr("COIN");
- map(0x6000, 0x6000).portr("DSW");
- map(0x8000, 0x8000).portr("IN0");
- map(0x8001, 0x8001).portr("IN1");
- map(0x8002, 0x8002).portr("IN2");
- map(0x8003, 0x8003).portr("IN3");
- map(0x8004, 0x8004).portr("IN4");
- map(0xa000, 0xa000).nopw(); //??
- map(0xc000, 0xc00f).mirror(0xff0).rom().region("proms", 0);
- map(0xe000, 0xe3ff).rom();
- map(0xe400, 0xe400).w(FUNC(alinvade_state::sounden_w));
- map(0xe800, 0xe800).rw(FUNC(alinvade_state::irqmask_r), FUNC(alinvade_state::irqmask_w)); //??
- map(0xec00, 0xffff).rom();
-}
-
-
-static INPUT_PORTS_START( alinvade )
- PORT_START("COIN")
- PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_COIN1 )
- PORT_BIT(0xef, IP_ACTIVE_LOW, IPT_UNKNOWN )
-
- PORT_START("IN0")
- PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_BUTTON1 ) PORT_PLAYER(1)
- PORT_BIT(0xdf, IP_ACTIVE_HIGH, IPT_UNKNOWN )
-
- PORT_START("IN1")
- PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_JOYSTICK_RIGHT ) PORT_2WAY PORT_PLAYER(1)
- PORT_BIT(0xdf, IP_ACTIVE_HIGH, IPT_UNKNOWN )
-
- PORT_START("IN2")
- PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_JOYSTICK_LEFT ) PORT_2WAY PORT_PLAYER(1)
- PORT_BIT(0xdf, IP_ACTIVE_HIGH, IPT_UNKNOWN )
-
- PORT_START("IN3")
- PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_START1 )
- PORT_BIT(0xdf, IP_ACTIVE_HIGH, IPT_UNKNOWN )
-
- PORT_START("IN4")
- PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_START2 )
- PORT_BIT(0xdf, IP_ACTIVE_HIGH, IPT_UNKNOWN )
-
- PORT_START("DSW")
- PORT_DIPNAME( 0x03, 0x00, DEF_STR( Lives ) )
- PORT_DIPSETTING( 0x00, "2" )
- PORT_DIPSETTING( 0x01, "3" )
- PORT_DIPSETTING( 0x02, "4" )
- PORT_DIPSETTING( 0x03, "5" )
- PORT_DIPNAME( 0x04, 0x00, DEF_STR ( Unknown ) ) // read, but not tested afterwards?
- PORT_DIPSETTING( 0x00, DEF_STR( Off ) )
- PORT_DIPSETTING( 0x04, DEF_STR( On ) )
- PORT_BIT( 0xf8, IP_ACTIVE_HIGH, IPT_UNUSED )
-INPUT_PORTS_END
-
-
-void alinvade_state::machine_start()
-{
- save_item(NAME(m_irqff));
- save_item(NAME(m_irqmask));
-}
-
-void alinvade_state::machine_reset()
-{
- m_irqmask = 1;
-}
-
-uint32_t alinvade_state::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
-{
- offs_t offs;
-
- for (offs = 0; offs < m_videoram.bytes(); offs++)
- {
- int i;
-
- uint8_t x = (offs << 3)&0x7f;
- int y = (offs >> 4)&0x7f;
- uint8_t data = m_videoram[offs];
-
- for (i = 0; i < 8; i++)
- {
- pen_t pen = (data & 0x01) ? rgb_t::white() : rgb_t::black();
- bitmap.pix32(y, x) = pen;
-
- data = data >> 1;
- x = x + 1;
- }
- }
-
-
- return 0;
-}
-
-WRITE_LINE_MEMBER(alinvade_state::vblank_irq)
-{
- if (state && BIT(m_irqmask, 0))
- m_maincpu->set_input_line(0,HOLD_LINE);
-}
-
-void alinvade_state::alinvade(machine_config &config)
-{
- /* basic machine hardware */
- M6502(config, m_maincpu, 2000000); /* ? MHz */
- m_maincpu->set_addrmap(AS_PROGRAM, &alinvade_state::alinvade_map);
-
- /* 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(128, 128);
- screen.set_visarea_full();
- screen.set_screen_update(FUNC(alinvade_state::screen_update));
- screen.screen_vblank().set(FUNC(alinvade_state::vblank_irq));
-
- /* sound hardware */
- SPEAKER(config, "mono").front_center();
- DISCRETE(config, m_discrete, alinvade_discrete).add_route(ALL_OUTPUTS, "mono", 1.0);
-}
-
-
-
-ROM_START( alinvade )
- ROM_REGION( 0x10000, "maincpu", 0 ) // todo, check mapping
- ROM_LOAD( "alien28.708", 0xe000, 0x0400, CRC(de376295) SHA1(e8eddbb1be1f8661c6b5b39c0d78a65bded65db2) )
- ROM_LOAD( "alien29.708", 0xec00, 0x0400, CRC(20212977) SHA1(9d24a6b403d968267079fa6241545bd5a01afebb) )
- ROM_LOAD( "alien30.708", 0xf000, 0x0400, CRC(734b691c) SHA1(9e562159061eecf4b1dee4ea0ee4752c901a54aa) )
- ROM_LOAD( "alien31.708", 0xf400, 0x0400, CRC(5a70535c) SHA1(2827e7d4bffca78bd035da04481e1e972ee2da39) )
- ROM_LOAD( "alien32.708", 0xf800, 0x0400, CRC(332dd234) SHA1(9974668344a2a351868a9e7757d1c3a497dc5621) )
- ROM_LOAD( "alien33.708", 0xfc00, 0x0400, CRC(e0d57fc7) SHA1(7b8ddcb4a86811592d2d0bbc61b2f19e5caa9ccc) )
-
- ROM_REGION( 0x20, "proms", 0 )
- ROM_LOAD( "prom", 0, 0x20, NO_DUMP )
- ROM_FILL( 0x00, 0x0f, 0xea )
- ROM_FILL( 0x0f, 0x01, 0x60 ) // rts for whole area, interrupt code jumps to various addresses here, check note on top.
-ROM_END
-
-
-GAMEL( 198?, alinvade, 0, alinvade, alinvade, alinvade_state, empty_init, ROT90, "Forbes?", "Alien Invaders", MACHINE_UNEMULATED_PROTECTION | MACHINE_IMPERFECT_SOUND | MACHINE_SUPPORTS_SAVE, layout_alinvade )