// license:BSD-3-Clause // copyright-holders:Roberto Fresca /****************************************************************************** JOKER'S WILD - SIGMA (1988) Preliminary driver by Roberto Fresca. ******************************************************************************* Hardware Notes (guessed): ------------------------ CPU: 1x M6809 Video: 1x M6845 CRTC or similar. I/O: 2x PIAs ?? (there is code to initialize PIAs at $8033) ******************************************************************************* *** Game Notes *** RND old notes: Game is trying to boot, and after approx. 90 seconds an error message appear on screen: "Random number generator is defective", then stuck here. See code at $9859 Currently the game spit an error about bad RAM, and after approx 90 seconds the playfield is drawn and then hang. ******************************************************************************* -------------------- *** Memory Map *** -------------------- 0x0000 - 0x07FF ; Video RAM. 0x2000 - 0x27FF ; Color RAM. 0x4004 - 0x4007 ; PIA?. 0x4008 - 0x400B ; PIA?. 0x6000 - 0x6001 ; M6845 CRTC. 0x8000 - 0xFFFF ; ROM space. *** MC6545 Initialization *** ---------------------------------------------------------------------------------------------------------------------- register: R00 R01 R02 R03 R04 R05 R06 R07 R08 R09 R10 R11 R12 R13 R14 R15 R16 R17 ---------------------------------------------------------------------------------------------------------------------- value: 0x20 0x18 0x1B 0x64 0x20 0x07 0x1A 0x1D 0x00 0x07 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00. ******************************************************************************* DRIVER UPDATES: [2008-10-30] - Fixed graphics to 2 bits per pixel. [2008-10-25] - Initial release. - ROMs load OK. - Proper ROMs decryption. - Added MC6845 CRTC. - Video RAM OK. - Added technical notes. TODO: - RND number generator. - Inputs - Sound. - A lot of work. *******************************************************************************/ #include "emu.h" #include "cpu/m6809/m6809.h" #include "video/mc6845.h" #include "machine/6821pia.h" #include "machine/nvram.h" #include "screen.h" #define MASTER_CLOCK XTAL(8'000'000) /* guess */ class jokrwild_state : public driver_device { public: jokrwild_state(const machine_config &mconfig, device_type type, const char *tag) : driver_device(mconfig, type, tag), m_videoram(*this, "videoram"), m_colorram(*this, "colorram"), m_maincpu(*this, "maincpu"), m_gfxdecode(*this, "gfxdecode") { } required_shared_ptr m_videoram; required_shared_ptr m_colorram; tilemap_t *m_bg_tilemap; DECLARE_WRITE8_MEMBER(jokrwild_videoram_w); DECLARE_WRITE8_MEMBER(jokrwild_colorram_w); DECLARE_READ8_MEMBER(rng_r); DECLARE_WRITE8_MEMBER(testa_w); DECLARE_WRITE8_MEMBER(testb_w); void init_jokrwild(); TILE_GET_INFO_MEMBER(get_bg_tile_info); virtual void video_start() override; DECLARE_PALETTE_INIT(jokrwild); uint32_t screen_update_jokrwild(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect); required_device m_maincpu; required_device m_gfxdecode; void jokrwild(machine_config &config); void jokrwild_map(address_map &map); }; /************************* * Video Hardware * *************************/ WRITE8_MEMBER(jokrwild_state::jokrwild_videoram_w) { m_videoram[offset] = data; m_bg_tilemap->mark_tile_dirty(offset); } WRITE8_MEMBER(jokrwild_state::jokrwild_colorram_w) { m_colorram[offset] = data; m_bg_tilemap->mark_tile_dirty(offset); } TILE_GET_INFO_MEMBER(jokrwild_state::get_bg_tile_info) { /* - bits - 7654 3210 xx-- ---- bank select. ---- xxxx color code. */ int attr = m_colorram[tile_index]; int code = m_videoram[tile_index] | ((attr & 0xc0) << 2); int color = (attr & 0x0f); SET_TILE_INFO_MEMBER(0, code , color , 0); } void jokrwild_state::video_start() { m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(FUNC(jokrwild_state::get_bg_tile_info),this), TILEMAP_SCAN_ROWS, 8, 8, 24, 26); } uint32_t jokrwild_state::screen_update_jokrwild(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect) { m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0); return 0; } PALETTE_INIT_MEMBER(jokrwild_state, jokrwild) { //missing proms } /***************************** * Read/Write Handlers * *****************************/ READ8_MEMBER(jokrwild_state::rng_r) { if(m_maincpu->pc() == 0xab32) return (offset == 0) ? 0x9e : 0x27; if(m_maincpu->pc() == 0xab3a) return (offset == 2) ? 0x49 : 0x92; return machine().rand() & 0xff; } /************************* * Memory Map Information * *************************/ void jokrwild_state::jokrwild_map(address_map &map) { map(0x0000, 0x03ff).ram().w(this, FUNC(jokrwild_state::jokrwild_videoram_w)).share("videoram"); map(0x0400, 0x07ff).ram(); //FIXME: backup RAM map(0x2000, 0x23ff).ram().w(this, FUNC(jokrwild_state::jokrwild_colorram_w)).share("colorram"); map(0x2400, 0x27ff).ram(); //stack RAM map(0x4004, 0x4007).rw("pia0", FUNC(pia6821_device::read), FUNC(pia6821_device::write)); map(0x4008, 0x400b).rw("pia1", FUNC(pia6821_device::read), FUNC(pia6821_device::write)); //optical sensor is here // AM_RANGE(0x4010, 0x4010) AM_READNOP /* R ???? */ map(0x6000, 0x6000).w("crtc", FUNC(mc6845_device::address_w)); map(0x6001, 0x6001).rw("crtc", FUNC(mc6845_device::register_r), FUNC(mc6845_device::register_w)); map(0x6100, 0x6100).portr("SW1"); map(0x6200, 0x6203).r(this, FUNC(jokrwild_state::rng_r));//another PIA? map(0x6300, 0x6300).portr("SW2"); map(0x8000, 0xffff).rom(); } /* I/O byte R/W ----------------- unknown writes: 4004-400b R/W ; 2x PIAs? 4010 R ; unknown. 6100 R/W ; unknown. 6200-6203 R/W ; extra PIA? 6300 R ; unknown. */ /************************* * Input Ports * *************************/ static INPUT_PORTS_START( jokrwild ) PORT_START("IN0") PORT_DIPNAME( 0x01, 0x01, DEF_STR( Unknown ) ) PORT_DIPSETTING( 0x01, DEF_STR( Off ) ) PORT_DIPSETTING( 0x00, DEF_STR( On ) ) PORT_DIPNAME( 0x02, 0x02, DEF_STR( Unknown ) ) PORT_DIPSETTING( 0x02, DEF_STR( Off ) ) PORT_DIPSETTING( 0x00, DEF_STR( On ) ) PORT_DIPNAME( 0x04, 0x04, DEF_STR( Unknown ) ) PORT_DIPSETTING( 0x04, DEF_STR( Off ) ) PORT_DIPSETTING( 0x00, DEF_STR( On ) ) PORT_DIPNAME( 0x08, 0x08, DEF_STR( Unknown ) ) PORT_DIPSETTING( 0x08, DEF_STR( Off ) ) PORT_DIPSETTING( 0x00, DEF_STR( On ) ) PORT_DIPNAME( 0x10, 0x10, DEF_STR( Unknown ) ) PORT_DIPSETTING( 0x10, DEF_STR( Off ) ) PORT_DIPSETTING( 0x00, DEF_STR( On ) ) PORT_DIPNAME( 0x20, 0x20, DEF_STR( Unknown ) ) PORT_DIPSETTING( 0x20, DEF_STR( Off ) ) PORT_DIPSETTING( 0x00, DEF_STR( On ) ) PORT_DIPNAME( 0x40, 0x40, DEF_STR( Unknown ) ) PORT_DIPSETTING( 0x40, DEF_STR( Off ) ) PORT_DIPSETTING( 0x00, DEF_STR( On ) ) PORT_DIPNAME( 0x80, 0x80, DEF_STR( Unknown ) ) PORT_DIPSETTING( 0x80, DEF_STR( Off ) ) PORT_DIPSETTING( 0x00, DEF_STR( On ) ) /* PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_SERVICE ) PORT_NAME("0-1") PORT_CODE(KEYCODE_1) PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_SERVICE ) PORT_NAME("0-2") PORT_CODE(KEYCODE_2) PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_SERVICE ) PORT_NAME("0-3") PORT_CODE(KEYCODE_3) PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_SERVICE ) PORT_NAME("0-4") PORT_CODE(KEYCODE_4) PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_SERVICE ) PORT_NAME("0-5") PORT_CODE(KEYCODE_5) PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_SERVICE ) PORT_NAME("0-6") PORT_CODE(KEYCODE_6) PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_SERVICE ) PORT_NAME("0-7") PORT_CODE(KEYCODE_7) PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_SERVICE ) PORT_NAME("0-8") PORT_CODE(KEYCODE_8) */ PORT_START("IN1") PORT_DIPNAME( 0x01, 0x01, DEF_STR( Unknown ) ) PORT_DIPSETTING( 0x01, DEF_STR( Off ) ) PORT_DIPSETTING( 0x00, DEF_STR( On ) ) PORT_DIPNAME( 0x02, 0x02, DEF_STR( Unknown ) ) PORT_DIPSETTING( 0x02, DEF_STR( Off ) ) PORT_DIPSETTING( 0x00, DEF_STR( On ) ) PORT_DIPNAME( 0x04, 0x04, DEF_STR( Unknown ) ) PORT_DIPSETTING( 0x04, DEF_STR( Off ) ) PORT_DIPSETTING( 0x00, DEF_STR( On ) ) PORT_DIPNAME( 0x08, 0x08, DEF_STR( Unknown ) ) PORT_DIPSETTING( 0x08, DEF_STR( Off ) ) PORT_DIPSETTING( 0x00, DEF_STR( On ) ) PORT_DIPNAME( 0x10, 0x10, DEF_STR( Unknown ) ) PORT_DIPSETTING( 0x10, DEF_STR( Off ) ) PORT_DIPSETTING( 0x00, DEF_STR( On ) ) PORT_DIPNAME( 0x20, 0x20, DEF_STR( Unknown ) ) PORT_DIPSETTING( 0x20, DEF_STR( Off ) ) PORT_DIPSETTING( 0x00, DEF_STR( On ) ) PORT_DIPNAME( 0x40, 0x40, DEF_STR( Unknown ) ) PORT_DIPSETTING( 0x40, DEF_STR( Off ) ) PORT_DIPSETTING( 0x00, DEF_STR( On ) ) PORT_DIPNAME( 0x80, 0x80, DEF_STR( Unknown ) ) PORT_DIPSETTING( 0x80, DEF_STR( Off ) ) PORT_DIPSETTING( 0x00, DEF_STR( On ) ) /* PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_SERVICE ) PORT_NAME("1-1") PORT_CODE(KEYCODE_Q) PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_SERVICE ) PORT_NAME("1-2") PORT_CODE(KEYCODE_W) PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_SERVICE ) PORT_NAME("1-3") PORT_CODE(KEYCODE_E) PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_SERVICE ) PORT_NAME("1-4") PORT_CODE(KEYCODE_R) PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_SERVICE ) PORT_NAME("1-5") PORT_CODE(KEYCODE_T) PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_SERVICE ) PORT_NAME("1-6") PORT_CODE(KEYCODE_Y) PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_SERVICE ) PORT_NAME("1-7") PORT_CODE(KEYCODE_U) PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_SERVICE ) PORT_NAME("1-8") PORT_CODE(KEYCODE_I) */ PORT_START("IN2") PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_SERVICE ) PORT_NAME("2-1") PORT_CODE(KEYCODE_A) PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_SERVICE ) PORT_NAME("2-2") PORT_CODE(KEYCODE_S) PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_SERVICE ) PORT_NAME("2-3") PORT_CODE(KEYCODE_D) PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_SERVICE ) PORT_NAME("2-4") PORT_CODE(KEYCODE_F) PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_SERVICE ) PORT_NAME("2-5") PORT_CODE(KEYCODE_G) PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_SERVICE ) PORT_NAME("2-6") PORT_CODE(KEYCODE_H) PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_SERVICE ) PORT_NAME("2-7") PORT_CODE(KEYCODE_J) PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_SERVICE ) PORT_NAME("2-8") PORT_CODE(KEYCODE_K) PORT_START("IN3") PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_SERVICE ) PORT_NAME("3-1") PORT_CODE(KEYCODE_Z) PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_SERVICE ) PORT_NAME("3-2") PORT_CODE(KEYCODE_X) PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_SERVICE ) PORT_NAME("3-3") PORT_CODE(KEYCODE_C) PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_SERVICE ) PORT_NAME("3-4") PORT_CODE(KEYCODE_V) PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_SERVICE ) PORT_NAME("3-5") PORT_CODE(KEYCODE_B) PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_SERVICE ) PORT_NAME("3-6") PORT_CODE(KEYCODE_N) PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_SERVICE ) PORT_NAME("3-7") PORT_CODE(KEYCODE_M) PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_SERVICE ) PORT_NAME("3-8") PORT_CODE(KEYCODE_L) PORT_START("SW1") PORT_DIPNAME( 0x01, 0x01, "sw1" ) PORT_DIPSETTING( 0x01, DEF_STR( Off ) ) PORT_DIPSETTING( 0x00, DEF_STR( On ) ) PORT_DIPNAME( 0x02, 0x02, DEF_STR( Unknown ) ) PORT_DIPSETTING( 0x02, DEF_STR( Off ) ) PORT_DIPSETTING( 0x00, DEF_STR( On ) ) PORT_DIPNAME( 0x04, 0x04, DEF_STR( Unknown ) ) PORT_DIPSETTING( 0x04, DEF_STR( Off ) ) PORT_DIPSETTING( 0x00, DEF_STR( On ) ) PORT_DIPNAME( 0x08, 0x08, DEF_STR( Unknown ) ) PORT_DIPSETTING( 0x08, DEF_STR( Off ) ) PORT_DIPSETTING( 0x00, DEF_STR( On ) ) PORT_DIPNAME( 0x10, 0x10, DEF_STR( Unknown ) ) PORT_DIPSETTING( 0x10, DEF_STR( Off ) ) PORT_DIPSETTING( 0x00, DEF_STR( On ) ) PORT_DIPNAME( 0x20, 0x20, DEF_STR( Unknown ) ) PORT_DIPSETTING( 0x20, DEF_STR( Off ) ) PORT_DIPSETTING( 0x00, DEF_STR( On ) ) PORT_DIPNAME( 0x40, 0x40, DEF_STR( Unknown ) ) PORT_DIPSETTING( 0x40, DEF_STR( Off ) ) PORT_DIPSETTING( 0x00, DEF_STR( On ) ) PORT_DIPNAME( 0x80, 0x80, DEF_STR( Unknown ) ) PORT_DIPSETTING( 0x80, DEF_STR( Off ) ) PORT_DIPSETTING( 0x00, DEF_STR( On ) ) PORT_START("SW2") PORT_DIPNAME( 0x01, 0x01, "sw2" ) PORT_DIPSETTING( 0x01, DEF_STR( Off ) ) PORT_DIPSETTING( 0x00, DEF_STR( On ) ) PORT_DIPNAME( 0x02, 0x02, DEF_STR( Unknown ) ) PORT_DIPSETTING( 0x02, DEF_STR( Off ) ) PORT_DIPSETTING( 0x00, DEF_STR( On ) ) PORT_DIPNAME( 0x04, 0x04, DEF_STR( Unknown ) ) PORT_DIPSETTING( 0x04, DEF_STR( Off ) ) PORT_DIPSETTING( 0x00, DEF_STR( On ) ) PORT_DIPNAME( 0x08, 0x08, DEF_STR( Unknown ) ) PORT_DIPSETTING( 0x08, DEF_STR( Off ) ) PORT_DIPSETTING( 0x00, DEF_STR( On ) ) PORT_DIPNAME( 0x10, 0x10, DEF_STR( Unknown ) ) PORT_DIPSETTING( 0x10, DEF_STR( Off ) ) PORT_DIPSETTING( 0x00, DEF_STR( On ) ) PORT_DIPNAME( 0x20, 0x20, DEF_STR( Unknown ) ) PORT_DIPSETTING( 0x20, DEF_STR( Off ) ) PORT_DIPSETTING( 0x00, DEF_STR( On ) ) PORT_DIPNAME( 0x40, 0x40, DEF_STR( Unknown ) ) PORT_DIPSETTING( 0x40, DEF_STR( Off ) ) PORT_DIPSETTING( 0x00, DEF_STR( On ) ) PORT_DIPNAME( 0x80, 0x80, DEF_STR( Unknown ) ) PORT_DIPSETTING( 0x80, DEF_STR( Off ) ) PORT_DIPSETTING( 0x00, DEF_STR( On ) ) INPUT_PORTS_END /************************* * Graphics Layouts * *************************/ static const gfx_layout charlayout = { 8, 8, 0x400, /* tiles */ 2, /* 2 bpp */ { RGN_FRAC(0,2), RGN_FRAC(1,2) }, { 0, 1, 2, 3, 4, 5, 6, 7 }, { 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8 }, 8*8 /* every char takes 8 consecutive bytes */ }; /****************************** * Graphics Decode Information * ******************************/ static GFXDECODE_START( gfx_jokrwild ) GFXDECODE_ENTRY( "gfx1", 0, charlayout, 0, 16 ) GFXDECODE_END /*********************** * PIA Interfaces * ***********************/ WRITE8_MEMBER(jokrwild_state::testa_w) { // printf("%02x A\n",data); } WRITE8_MEMBER(jokrwild_state::testb_w) { // printf("%02x B\n",data); } /************************* * Machine Drivers * *************************/ MACHINE_CONFIG_START(jokrwild_state::jokrwild) /* basic machine hardware */ MCFG_DEVICE_ADD("maincpu", M6809, MASTER_CLOCK/2) /* guess */ MCFG_DEVICE_PROGRAM_MAP(jokrwild_map) // MCFG_NVRAM_ADD_0FILL("nvram") MCFG_DEVICE_ADD("pia0", PIA6821, 0) MCFG_PIA_READPA_HANDLER(IOPORT("IN0")) MCFG_PIA_READPB_HANDLER(IOPORT("IN1")) MCFG_PIA_WRITEPA_HANDLER(WRITE8(*this, jokrwild_state, testa_w)) MCFG_PIA_WRITEPB_HANDLER(WRITE8(*this, jokrwild_state, testb_w)) MCFG_DEVICE_ADD("pia1", PIA6821, 0) MCFG_PIA_READPA_HANDLER(IOPORT("IN2")) MCFG_PIA_READPB_HANDLER(IOPORT("IN3")) /* video hardware */ MCFG_SCREEN_ADD("screen", RASTER) MCFG_SCREEN_REFRESH_RATE(60) MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(0)) MCFG_SCREEN_SIZE((32+1)*8, (32+1)*8) // From MC6845, registers 00 & 04. (value-1) MCFG_SCREEN_VISIBLE_AREA(0*8, 24*8-1, 0*8, 26*8-1) // From MC6845, registers 01 & 06. MCFG_SCREEN_UPDATE_DRIVER(jokrwild_state, screen_update_jokrwild) MCFG_SCREEN_PALETTE("palette") MCFG_DEVICE_ADD("gfxdecode", GFXDECODE, "palette", gfx_jokrwild) MCFG_PALETTE_ADD("palette", 512) MCFG_PALETTE_INIT_OWNER(jokrwild_state, jokrwild) MCFG_MC6845_ADD("crtc", MC6845, "screen", MASTER_CLOCK/16) /* guess */ MCFG_MC6845_SHOW_BORDER_AREA(false) MCFG_MC6845_CHAR_WIDTH(8) MCFG_MC6845_OUT_VSYNC_CB(INPUTLINE("maincpu", INPUT_LINE_NMI)) MACHINE_CONFIG_END /************************* * Rom Load * *************************/ /* One day I will write about HOW I got this dump... :) "Only two things are infinite: The universe and human stupidity... and I'm not sure about the universe." (Albert Einstein) */ ROM_START( jokrwild ) ROM_REGION( 0x10000, "maincpu", 0 ) ROM_LOAD( "jwild.7b", 0x8000, 0x4000, CRC(744cd029) SHA1(766faea330836344ffc6a1b4e1a64a679b9bf579) ) ROM_LOAD( "jwild.7a", 0xc000, 0x4000, CRC(ca8e4f58) SHA1(a4f682980fe562dcd8743890ce94619719cd1153) ) ROM_REGION( 0x4000, "gfx1", 0 ) ROM_LOAD( "jwild.2h", 0x0000, 0x0800, CRC(aed38e00) SHA1(9530078f6c22d67594606476c3698a75e052d1d6) ) ROM_LOAD( "jwild.2g", 0x1000, 0x0800, CRC(d635f025) SHA1(f70d5a837797e2250a7e581b96e60a704da25511) ) ROM_LOAD( "jwild.2f", 0x0800, 0x0800, CRC(9c1e057c) SHA1(23fd630aa20a4ffa5179d4a4fa32c6ee4b3f9c1b) ) ROM_LOAD( "jwild.2e", 0x1800, 0x0800, CRC(a66ae0a1) SHA1(8e6bfcb169148fdbcc36f4f35747c4805762ddd7) ) ROM_LOAD( "jwild.2d", 0x2000, 0x0800, CRC(76a0bcb4) SHA1(34c24ad63b1182166209074259e8f0aabe1ad331) ) ROM_LOAD( "jwild.2c", 0x3000, 0x0800, CRC(8d5e0b8f) SHA1(da6692d0c2074427f801b3f1861e3d03075963a2) ) ROM_LOAD( "jwild.2b", 0x2800, 0x0800, CRC(a264b0be) SHA1(a935dd3df8bbae9b7788d6c2a8c378fad07d2b43) ) ROM_LOAD( "jwild.2a", 0x3800, 0x0800, CRC(8084d0c2) SHA1(370f30f0138e2f7743a97df92379c7b879d90aed) ) ROM_REGION( 0x0100, "proms", 0 ) ROM_LOAD( "prom.x", 0x0000, 0x0100, NO_DUMP ) ROM_END /************************** * Driver Initialization * **************************/ void jokrwild_state::init_jokrwild() /***************************************************************************** Encryption was made by pages of 256 bytes. For each page, the value is XORed with a fixed value (0xCC), then XORed again with the offset of the original value inside its own page. Example: For encrypted value at offset 0x123A (0x89)... 0x89 XOR 0xCC XOR 0x3A = 0x7F *****************************************************************************/ { uint8_t *srcp = memregion( "maincpu" )->base(); for (int i = 0x8000; i < 0x10000; i++) { int offs = i & 0xff; srcp[i] = srcp[i] ^ 0xcc ^ offs; } } /************************* * Game Drivers * *************************/ // YEAR NAME PARENT MACHINE INPUT STATE INIT ROT COMPANY FULLNAME FLAGS GAME( 1988, jokrwild, 0, jokrwild, jokrwild, jokrwild_state, init_jokrwild, ROT0, "Sigma", "Joker's Wild (encrypted)", MACHINE_NO_SOUND | MACHINE_NOT_WORKING )