// 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<uint8_t> m_videoram;
required_shared_ptr<uint8_t> 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<cpu_device> m_maincpu;
required_device<gfxdecode_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 )