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diff --git a/src/mame/jaleco/skyfox.cpp b/src/mame/jaleco/skyfox.cpp
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+// license:BSD-3-Clause
+// copyright-holders: Luca Elia
+
+/***************************************************************************
+
+ -= Sky Fox / Exerizer =-
+
+ driver by Luca Elia (l.elia@tin.it)
+
+
+CPU : Z80A x 2
+Sound: YM2203C x 2
+Other: 2 HM6116LP-3 (one on each board)
+ 1 KM6264L-15 (on bottom board)
+
+TODO:
+- The background rendering is entirely guesswork;
+- DMA trigger happens at vpos 24 with legacy video parameters,
+ needs H/VSync PCB calculations, also notice that 62.65 Hz comes from the
+ bootleg and may be different for original;
+
+2008-07
+Verified Dip locations and recommended settings with manual
+
+***************************************************************************/
+
+#include "emu.h"
+
+#include "cpu/z80/z80.h"
+#include "machine/gen_latch.h"
+#include "sound/ymopn.h"
+#include "video/resnet.h"
+
+#include "emupal.h"
+#include "screen.h"
+#include "speaker.h"
+
+
+namespace {
+
+class skyfox_state : public driver_device
+{
+public:
+ skyfox_state(const machine_config &mconfig, device_type type, const char *tag) :
+ driver_device(mconfig, type, tag),
+ m_maincpu(*this, "maincpu"),
+ m_audiocpu(*this, "audiocpu"),
+ m_gfxdecode(*this, "gfxdecode"),
+ m_screen(*this, "screen"),
+ m_palette(*this, "palette"),
+ m_spriteram(*this, "spriteram"),
+ m_bgram(*this, "bgram"),
+ m_bgrom(*this, "tiles")
+ { }
+
+ void skyfox(machine_config &config);
+
+ void init_skyfox();
+
+ DECLARE_INPUT_CHANGED_MEMBER(coin_inserted);
+
+protected:
+ virtual void machine_start() override ATTR_COLD;
+ virtual void machine_reset() override ATTR_COLD;
+
+private:
+ // devices/memory pointers
+ required_device<cpu_device> m_maincpu;
+ required_device<cpu_device> m_audiocpu;
+ required_device<gfxdecode_device> m_gfxdecode;
+ required_device<screen_device> m_screen;
+ required_device<palette_device> m_palette;
+ required_shared_ptr<uint8_t> m_spriteram;
+ required_shared_ptr<uint8_t> m_bgram;
+ required_region_ptr<uint8_t> m_bgrom;
+
+ uint8_t m_bg_ctrl = 0;
+
+ void bg_ctrl_w(uint8_t data);
+ void palette(palette_device &palette) const;
+ uint32_t screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
+ void draw_sprites(bitmap_ind16 &bitmap, const rectangle &cliprect);
+ void draw_background(bitmap_ind16 &bitmap, const rectangle &cliprect);
+
+ void main_map(address_map &map) ATTR_COLD;
+ void sound_map(address_map &map) ATTR_COLD;
+};
+
+
+/***************************************************************************
+
+
+ [ 1 Background ]
+
+ The stars in the background are not tile based (I think!) and
+ their rendering is entirely guesswork for now..
+
+ I draw a star for each horizontal line using 2 bytes in the
+ background ROM:
+
+ - the first byte seems a color / shape info
+ - the second byte seems a position info
+
+ The ROM holds 4 chunks of $2000 bytes. Most of the data does not
+ change between chunks, while the remaining part (which is rendered
+ to what seems a "milky way") pulsates in color and/or shape
+ to simulate the shimmering of stars (?!) if we draw one chunk only
+ and cycle through the four. Indeed, there's a register cycling
+ through 4 values.
+
+ Since the result kind of matches a screenshot we have, I feel the
+ drawn result is not that far from reality. On the other hand we
+ have a random arrangement of stars, so it's hard to tell for sure..
+
+ [ 256 Sprites ]
+
+ Sprites are 8 planes deep and can be 8x8, 16x16 or 32x32 pixels
+ in size. They are stored as 32x32x8 tiles in the ROMs.
+
+
+***************************************************************************/
+
+/***************************************************************************
+
+ Convert the color PROMs into a more useable format.
+
+ There are three 256x4 palette PROMs (one per gun).
+ The palette PROMs are connected to the RGB output this way:
+
+ bit 3 -- 110 ohm resistor -- RED/GREEN/BLUE
+ -- 220 ohm resistor -- RED/GREEN/BLUE
+ -- 680 ohm resistor -- RED/GREEN/BLUE
+ bit 0 -- 1.2kohm resistor -- RED/GREEN/BLUE
+
+***************************************************************************/
+
+static constexpr res_net_decode_info decode_info =
+{
+ 1,
+ 0, 255, // start/end
+ // R, G, B,
+ { 0, 0x100, 0x200, }, // offsets
+ { 0, 0, 0, }, // shifts
+ { 0xf, 0xf, 0xf, } // masks
+};
+
+static constexpr res_net_info net_info =
+{
+ RES_NET_VCC_5V | RES_NET_VBIAS_5V | RES_NET_VIN_TTL_OUT,
+ {
+ { RES_NET_AMP_NONE, 0, 0, 4, { 1200, 680, 220, 110 } },
+ { RES_NET_AMP_NONE, 0, 0, 4, { 1200, 680, 220, 110 } },
+ { RES_NET_AMP_NONE, 0, 0, 4, { 1200, 680, 220, 110 } }
+ }
+};
+
+void skyfox_state::palette(palette_device &palette) const
+{
+ uint8_t const *const color_prom = memregion("proms")->base();
+ std::vector<rgb_t> rgb;
+
+ compute_res_net_all(rgb, color_prom, decode_info, net_info);
+ palette.set_pen_colors(0, rgb);
+}
+
+
+/***************************************************************************
+
+ Sprites Drawing
+
+Offset: Value:
+
+03 Code: selects one of the 32x32 tiles in the ROMs.
+ (Tiles $80-ff are bankswitched to cover $180 tiles)
+
+02 Code + Attr
+
+ 7654 ---- Code (low 4 bits)
+ 8x8 sprites use bits 7654 (since there are 16 8x8 tiles in the 32x32 one)
+ 16x16 sprites use bits --54 (since there are 4 16x16 tiles in the 32x32 one)
+ 32x32 sprites use no bits (since the 32x32 tile is already selected)
+
+ 7--- 3--- Size
+ 1--- 1--- : 32x32 sprites
+ 0--- 1--- : 16x16 sprites
+ 8x8 sprites otherwise
+
+ ---- -2-- Flip Y
+ ---- --1- Flip X
+ ---- ---0 X Low Bit
+
+00 Y
+
+01 X (High 8 Bits)
+
+***************************************************************************/
+
+void skyfox_state::draw_sprites(bitmap_ind16 &bitmap, const rectangle &cliprect)
+{
+ gfx_element *gfx = m_gfxdecode->gfx(0);
+ int const width = m_screen->width();
+ int const height = m_screen->height();
+
+ // The 32x32 tiles in the 80-ff range are bankswitched
+ int const shift = (m_bg_ctrl & 0x80) ? (4 - 1) : 4;
+
+ for (int offs = 0; offs < m_spriteram.bytes(); offs += 4)
+ {
+ int code = m_spriteram[offs + 3] << 8 | m_spriteram[offs + 2];
+ int flipx = code & 0x2;
+ int flipy = code & 0x4;
+ int y = m_spriteram[offs + 0];
+ int x = m_spriteram[offs + 1] << 1 | (code & 1);
+
+ int const high_code = ((code >> 4) & 0x7f0) + ((code & 0x8000) >> shift);
+
+ int low_code, n;
+
+ switch (code & 0x88)
+ {
+ case 0x88: n = 4; low_code = 0; break;
+ case 0x08: n = 2; low_code = (code & 0x20) >> 2 | (code & 0x10) >> 3; break;
+ default: n = 1; low_code = (code >> 4) & 0xf; break;
+ }
+
+ if (m_bg_ctrl & 1) // flipscreen
+ {
+ x = width - x - n * 8;
+ y = height - y - n * 8;
+ flipx = !flipx;
+ flipy = !flipy;
+ }
+
+ int xstart, ystart, xend, yend, xinc, yinc;
+
+ if (flipx) { xstart = n - 1; xend = -1; xinc = -1; }
+ else { xstart = 0; xend = n; xinc = +1; }
+
+ if (flipy) { ystart = n - 1; yend = -1; yinc = -1; }
+ else { ystart = 0; yend = n; yinc = +1; }
+
+
+ code = low_code + high_code;
+
+ for (int dy = ystart; dy != yend; dy += yinc)
+ {
+ for (int dx = xstart; dx != xend; dx += xinc, code++)
+ {
+ gfx->transpen(bitmap, cliprect, code, 0, flipx, flipy, dx * 8 + x, dy * 8 + y, 0xff);
+
+ // wraparound y - BTANB: large sprites exiting the screen sometimes reappear on the other edge
+ gfx->transpen(bitmap, cliprect, code, 0, flipx, flipy, dx * 8 + x, dy * 8 + y - 256, 0xff);
+ }
+
+ if (n == 2)
+ code += 2;
+ }
+ }
+}
+
+
+
+/***************************************************************************
+
+ Background Rendering
+
+***************************************************************************/
+
+void skyfox_state::draw_background(bitmap_ind16 &bitmap, const rectangle &cliprect)
+{
+ // Blinking stops until the first star moves after turning on the power
+ bool const blinking = (m_bg_ctrl & 0x8);
+ /* Star pattern change. This will change when all star clusters go out of screen or when the player restarts.
+ When it changes, it will change color of the star clusters. */
+ int const pattern = (m_bg_ctrl & 0x6) >> 1;
+
+ for (int i = 0; i < 0x1000; i++)
+ {
+ // contains the position of stars from 0xd4e0 in RAM
+ int const ramoffset = 0xe0 + (i & 0xf) * 2;
+ int const pos = m_bgram[ramoffset + 1] * 2 + ((m_bgram[ramoffset] & 0x80) ? 1 : 0);
+
+ // ROM offset of star pattern
+ int const offs = (i * 2) % 0x2000 + pattern * 0x2000;
+
+ /* Adjusted with 1 pixel accuracy compared to PCB.
+ Confirmed that pixel and color pattern match in the "1UP START" screen. */
+ int const pen = m_bgrom[offs];
+ int const x = m_bgrom[offs + 1] * 2 + pos + 0x5b;
+ int const y = (i >> 4) + 1;
+
+ /* When flipscreen is enabled, scroll direction is flipped by only in-game subroutine.
+ This PCB does not seem to support background flip. */
+
+ /* This looks perfect at first glance.
+ but when strict compared on "1UP START" screen,
+ it seems the blinking pattern in each star may be different. */
+ if (((m_bg_ctrl >> 4) & 3) != (pen & 3) || !blinking)
+ bitmap.pix(y % 256, x % 512) = pen;
+ }
+}
+
+
+/***************************************************************************
+
+ Screen Drawing
+
+***************************************************************************/
+
+uint32_t skyfox_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
+{
+ bitmap.fill(0xff, cliprect); // the bg is black
+ draw_background(bitmap, cliprect);
+ draw_sprites(bitmap, cliprect);
+ return 0;
+}
+
+
+/***************************************************************************
+
+ Main CPU
+
+***************************************************************************/
+
+void skyfox_state::bg_ctrl_w(uint8_t data)
+{
+ m_bg_ctrl = data;
+}
+
+void skyfox_state::main_map(address_map &map)
+{
+ map(0x0000, 0xbfff).rom();
+ map(0xc000, 0xcfff).ram();
+ map(0xd000, 0xd3ff).ram().share(m_spriteram);
+ map(0xd400, 0xd4ff).ram().share(m_bgram); // For background stars
+ // TODO: verify if A11 is unconnected
+ map(0xd500, 0xdfff).ram();
+ map(0xe000, 0xe000).portr("INPUTS");
+ map(0xe001, 0xe001).portr("DSW0");
+ map(0xe002, 0xe002).portr("DSW1");
+ map(0xe008, 0xe008).w(FUNC(skyfox_state::bg_ctrl_w));
+ map(0xe009, 0xe009).w("soundlatch", FUNC(generic_latch_8_device::write));
+// map(0xe00a, 0xe00e) // POST only?
+ map(0xe00f, 0xe00f).nopw(); // DMA trigger
+ map(0xf001, 0xf001).portr("DSW2");
+}
+
+
+/***************************************************************************
+
+ Sound CPU
+
+***************************************************************************/
+
+void skyfox_state::sound_map(address_map &map)
+{
+ map(0x0000, 0x7fff).rom();
+ map(0x8000, 0x87ff).ram();
+// map(0x9000, 0x9001).nopw(); // ??
+ map(0xa000, 0xa001).rw("ym1", FUNC(ym2203_device::read), FUNC(ym2203_device::write));
+// map(0xb000, 0xb001).nopw(); // ??
+ map(0xc000, 0xc001).rw("ym2", FUNC(ym2203_device::read), FUNC(ym2203_device::write));
+ map(0xb000, 0xb000).r("soundlatch", FUNC(generic_latch_8_device::read));
+}
+
+
+/***************************************************************************
+
+ Input Ports
+
+***************************************************************************/
+
+INPUT_CHANGED_MEMBER(skyfox_state::coin_inserted)
+{
+ m_maincpu->set_input_line(INPUT_LINE_NMI, newval ? CLEAR_LINE : ASSERT_LINE);
+}
+
+static INPUT_PORTS_START( skyfox )
+ PORT_START("INPUTS")
+ PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_UP )
+ PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN )
+ PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT )
+ PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT )
+ PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_BUTTON2 )
+ PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_BUTTON1 )
+ PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_START1 )
+ PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_START2 )
+
+ PORT_START("DSW0")
+ PORT_DIPNAME( 0x01, 0x01, "Unknown 1-0" ) // rest unused?
+ PORT_DIPSETTING( 0x01, DEF_STR( Off ) )
+ PORT_DIPSETTING( 0x00, DEF_STR( On ) )
+ PORT_DIPNAME( 0x02, 0x02, "Unknown 1-1" )
+ PORT_DIPSETTING( 0x02, DEF_STR( Off ) )
+ PORT_DIPSETTING( 0x00, DEF_STR( On ) )
+ PORT_DIPNAME( 0x04, 0x04, "Unknown 1-2" )
+ PORT_DIPSETTING( 0x04, DEF_STR( Off ) )
+ PORT_DIPSETTING( 0x00, DEF_STR( On ) )
+ PORT_DIPNAME( 0x18, 0x08, DEF_STR( Bonus_Life ) ) PORT_DIPLOCATION("SW1:4,5")
+ PORT_DIPSETTING( 0x00, "20K" )
+ PORT_DIPSETTING( 0x08, "30K" )
+ PORT_DIPSETTING( 0x10, "40K" )
+ PORT_DIPSETTING( 0x18, "50K" )
+ PORT_DIPNAME( 0x20, 0x00, DEF_STR( Difficulty ) ) PORT_DIPLOCATION("SW1:6")
+ PORT_DIPSETTING( 0x20, DEF_STR( Medium ) )
+ PORT_DIPSETTING( 0x00, DEF_STR( Hard ) )
+ PORT_DIPNAME( 0x40, 0x40, DEF_STR( Flip_Screen ) ) PORT_DIPLOCATION("SW1:7")
+ PORT_DIPSETTING( 0x40, DEF_STR( Off ) )
+ PORT_DIPSETTING( 0x00, DEF_STR( On ) )
+ PORT_DIPNAME( 0x80, 0x00, DEF_STR( Cabinet ) ) PORT_DIPLOCATION("SW1:8")
+ PORT_DIPSETTING( 0x00, DEF_STR( Upright ) )
+ PORT_DIPSETTING( 0x80, DEF_STR( Cocktail ) )
+
+ PORT_START("DSW1") // Coins, DSW + Vblank
+ PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_CUSTOM ) PORT_READ_LINE_DEVICE_MEMBER("screen", FUNC(screen_device::vblank))
+ PORT_DIPNAME( 0x0e, 0x00, DEF_STR( Coinage ) ) PORT_DIPLOCATION("SW2:1,2,3")
+ PORT_DIPSETTING( 0x0e, DEF_STR( 5C_1C ) )
+ PORT_DIPSETTING( 0x0a, DEF_STR( 4C_1C ) )
+ PORT_DIPSETTING( 0x06, DEF_STR( 3C_1C ) )
+ PORT_DIPSETTING( 0x02, DEF_STR( 2C_1C ) )
+ PORT_DIPSETTING( 0x00, DEF_STR( 1C_1C ) )
+ PORT_DIPSETTING( 0x04, DEF_STR( 1C_2C ) )
+ PORT_DIPSETTING( 0x08, DEF_STR( 1C_3C ) )
+ PORT_DIPSETTING( 0x0c, DEF_STR( 1C_4C ) )
+ // According to manual, there is also "SW2:4" which has to be always OFF
+ 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 )
+
+ PORT_START("DSW2") // DSW
+ PORT_DIPNAME( 0x07, 0x02, DEF_STR( Lives ) ) PORT_DIPLOCATION("SW1:1,2,3")
+ PORT_DIPSETTING( 0x00, "1" )
+ PORT_DIPSETTING( 0x01, "2" )
+ PORT_DIPSETTING( 0x02, "3" )
+ PORT_DIPSETTING( 0x03, "4" )
+ PORT_DIPSETTING( 0x04, "5" )
+ PORT_DIPSETTING( 0x05, "5" ) // dupe
+ PORT_DIPSETTING( 0x06, "5" ) // dupe
+ PORT_DIPSETTING( 0x07, "Infinite (Cheat)")
+ PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_UNKNOWN )
+ 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 )
+
+ PORT_START("COINS") // Fake input port, coins are directly connected on NMI line
+ PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_COIN1 ) PORT_CHANGED_MEMBER(DEVICE_SELF, FUNC(skyfox_state::coin_inserted), 0)
+ PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_COIN2 ) PORT_CHANGED_MEMBER(DEVICE_SELF, FUNC(skyfox_state::coin_inserted), 0)
+INPUT_PORTS_END
+
+
+
+
+/***************************************************************************
+
+ Graphics Layouts
+
+***************************************************************************/
+
+/* 8x8x8 tiles (note that the tiles in the ROMs are 32x32x8, but
+ we cut them in 8x8x8 ones in the init function, in order to
+ support 8x8, 16x16 and 32x32 sprites. */
+
+static GFXDECODE_START( gfx_skyfox )
+ GFXDECODE_ENTRY( "sprites", 0, gfx_8x8x8_raw, 0, 1 )
+GFXDECODE_END
+
+
+/***************************************************************************
+
+ Machine Drivers
+
+***************************************************************************/
+
+void skyfox_state::machine_start()
+{
+ save_item(NAME(m_bg_ctrl));
+}
+
+void skyfox_state::machine_reset()
+{
+ m_bg_ctrl = 0;
+}
+
+void skyfox_state::skyfox(machine_config &config)
+{
+ // basic machine hardware
+ Z80(config, m_maincpu, XTAL(8'000'000) / 2); // Verified at 4MHz
+ m_maincpu->set_addrmap(AS_PROGRAM, &skyfox_state::main_map);
+ // IM0, never enables ei opcode
+
+ Z80(config, m_audiocpu, XTAL(14'318'181) / 8); // Verified at 1.789772MHz
+ m_audiocpu->set_addrmap(AS_PROGRAM, &skyfox_state::sound_map);
+
+ // video hardware
+ SCREEN(config, m_screen, SCREEN_TYPE_RASTER);
+ // TODO: legacy screen configuration with no vblank irq
+ m_screen->set_refresh_hz(62.65);
+ m_screen->set_vblank_time(ATTOSECONDS_IN_USEC(2500)); // not accurate
+ m_screen->set_size(512, 256);
+ m_screen->set_visarea(0+0x60, 320-1+0x60, 0+16, 256-1-16); // from $30*2 to $CC*2+8
+ m_screen->set_screen_update(FUNC(skyfox_state::screen_update));
+ m_screen->set_palette(m_palette);
+
+ GFXDECODE(config, m_gfxdecode, m_palette, gfx_skyfox);
+ PALETTE(config, m_palette, FUNC(skyfox_state::palette), 256); // 256 static colors
+
+ // sound hardware
+ SPEAKER(config, "mono").front_center();
+
+ GENERIC_LATCH_8(config, "soundlatch");
+
+ YM2203(config, "ym1", XTAL(14'318'181) / 8).add_route(ALL_OUTPUTS, "mono", 0.80); // Verified at 1.789772MHz
+
+ YM2203(config, "ym2", XTAL(14'318'181) / 8).add_route(ALL_OUTPUTS, "mono", 0.80); // Verified at 1.789772MHz
+}
+
+
+
+/***************************************************************************
+
+ ROMs Loading
+
+****************************************************************************
+
+ Sky Fox
+
+
+c042 : Lives
+c044-5 : Score (BCD)
+c048-9 : Power (BCD)
+
+****************************************************************************
+
+ Exerizer [Bootleg]
+
+malcor
+
+Location Type File ID Checksum
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+TB 5E 27C256 1-J F302 [ background ]
+TB 5N 27C256 1-I F5E3 [ sound ]
+LB 27C256 1-A A53E [ program 1 ]
+LB 27C256 1-B 382C [ program 2 ]
+LB 27C512 1-C CDAC [ GFX ]
+LB 27C512 1-D 9C7A [ GFX ]
+LB 27C512 1-E D808 [ GFX ]
+LB 27C512 1-F F87E [ GFX ]
+LB 27C512 1-G 9709 [ GFX ]
+LB 27C512 1-H DFDA [ GFX ]
+TB 82S129 1.BPR 0972 [ video blue ]
+TB 82S129 2.BPR 0972 [ video red ]
+TB 82S129 3.BPR 0972 [ video green ]
+
+Lower board ROM locations:
+
+---=======------=======----
+| CN2 CN1 |
+| 1-A |
+| |
+| 1-B |
+| |
+| |
+| 1 1 1 1 1 1|
+| H G F E D C|
+---------------------------
+
+Notes - This archive is of a bootleg copy,
+ - Japanese program revision
+ - Although the colour PROMs have the same checksums,
+ they are not the same.
+
+Main processor - Z80 @ 4MHz (8MHz OSC / 2)
+Sound processor - Z80 @ 1.789772MHz (14.31818MHz OSC / 8)
+ - YM2203C x2 @ 1.789772MHzMHz (14.31818MHz OSC / 8)
+
+Vsync: 62.65hz
+
+ CPU board: Jaleco made in japan ER-8736
+Video Board: Jaleco made in japan ER-8737
+
+***************************************************************************/
+
+
+ROM_START( skyfox )
+ ROM_REGION( 0x10000, "maincpu", 0 ) // Z80 code
+ ROM_LOAD( "skyfox1.bin", 0x00000, 0x8000, CRC(b4d4bb6f) SHA1(ed1cf6d91ca7170cb7d1c80b586c11164430fd49) )
+ ROM_LOAD( "skyfox2.bin", 0x08000, 0x8000, CRC(e15e0263) SHA1(005934327834aed46b17161aef82117ee508e9c4) ) // identical halves
+
+ ROM_REGION( 0x10000, "audiocpu", 0 ) // Z80 code
+ ROM_LOAD( "skyfox9.bin", 0x00000, 0x8000, CRC(0b283bf5) SHA1(5b14d0beea689ee7e9174017e5a127435df4fbe3) )
+
+ ROM_REGION( 0x60000, "sprites", 0 )
+ ROM_LOAD( "skyfox3.bin", 0x00000, 0x10000, CRC(3a17a929) SHA1(973fb36af416161e04a83d7869819d9b13df18cd) )
+ ROM_LOAD( "skyfox4.bin", 0x10000, 0x10000, CRC(358053bb) SHA1(589e3270eda0d44e73fbc7ac06e782f332920b39) )
+ ROM_LOAD( "skyfox5.bin", 0x20000, 0x10000, CRC(c1215a6e) SHA1(5ca30be8a68ac6a00907cc9e47ede0acec980f46) )
+ ROM_LOAD( "skyfox6.bin", 0x30000, 0x10000, CRC(cc37e15d) SHA1(80806df6185f7b8c2d3ab98420ca514df3e63c8d) )
+ ROM_LOAD( "skyfox7.bin", 0x40000, 0x10000, CRC(fa2ab5b4) SHA1(c0878b25dae28f7d49e14376ff885d1d4e3d5dfe) )
+ ROM_LOAD( "skyfox8.bin", 0x50000, 0x10000, CRC(0e3edc49) SHA1(3d1c59ecaabe1c9517203b7e814db41d5cff0cd4) )
+
+ ROM_REGION( 0x08000, "tiles", 0 )
+ ROM_LOAD( "skyfox10.bin", 0x0000, 0x8000, CRC(19f58f9c) SHA1(6887216243b47152129448cbb4c7d52309feed03) )
+
+ ROM_REGION( 0x300, "proms", 0 ) // colors
+ ROM_LOAD( "sfoxrprm.bin", 0x000, 0x100, CRC(79913c7f) SHA1(e64e6a3eb55f37984cb2597c8ffba6bc3bad49c7) ) // R
+ ROM_LOAD( "sfoxgprm.bin", 0x100, 0x100, CRC(fb73d434) SHA1(4a9bd61fbdce9441753c5921f95ead5c4655957e) ) // G
+ ROM_LOAD( "sfoxbprm.bin", 0x200, 0x100, CRC(60d2ab41) SHA1(e58a54f2aaee5c07136d5437e513d61fb18fbd9f) ) // B
+ROM_END
+
+ROM_START( exerizer )
+ ROM_REGION( 0x10000, "maincpu", 0 ) // Z80 code
+ ROM_LOAD( "1.2v", 0x00000, 0x8000, CRC(5df72a5d) SHA1(ca35ac06f3702fd650a584da2f442fbc61c00fce) )
+ ROM_LOAD( "2.3v", 0x08000, 0x8000, CRC(e15e0263) SHA1(005934327834aed46b17161aef82117ee508e9c4) ) // 1-b
+
+ ROM_REGION( 0x10000, "audiocpu", 0 ) // Z80 code
+ ROM_LOAD( "9.5n", 0x00000, 0x8000, CRC(0b283bf5) SHA1(5b14d0beea689ee7e9174017e5a127435df4fbe3) ) // 1-i
+
+ ROM_REGION( 0x60000, "sprites", 0 )
+ ROM_LOAD( "3-1.7w", 0x00000, 0x10000, CRC(3a17a929) SHA1(973fb36af416161e04a83d7869819d9b13df18cd) )
+ ROM_LOAD( "4.7u", 0x10000, 0x10000, CRC(358053bb) SHA1(589e3270eda0d44e73fbc7ac06e782f332920b39) ) // 1-d
+ ROM_LOAD( "5-1.7t", 0x20000, 0x10000, CRC(c1215a6e) SHA1(5ca30be8a68ac6a00907cc9e47ede0acec980f46) )
+ ROM_LOAD( "6.7s", 0x30000, 0x10000, CRC(cc37e15d) SHA1(80806df6185f7b8c2d3ab98420ca514df3e63c8d) ) // 1-f
+ ROM_LOAD( "7.7p", 0x40000, 0x10000, CRC(c9bbfe5c) SHA1(ce3f7d32baa8bb0bfc110877b5b5f4648ee959ac) )
+ ROM_LOAD( "8.7n", 0x50000, 0x10000, CRC(0e3edc49) SHA1(3d1c59ecaabe1c9517203b7e814db41d5cff0cd4) ) // 1-h
+
+ ROM_REGION( 0x08000, "tiles", 0 )
+ ROM_LOAD( "10.5e", 0x0000, 0x8000, CRC(19f58f9c) SHA1(6887216243b47152129448cbb4c7d52309feed03) ) // 1-j
+
+ ROM_REGION( 0x300, "proms", 0 ) // colors
+ ROM_LOAD( "r.1c", 0x000, 0x100, CRC(79913c7f) SHA1(e64e6a3eb55f37984cb2597c8ffba6bc3bad49c7) ) // 2-bpr
+ ROM_LOAD( "g.1b", 0x100, 0x100, CRC(fb73d434) SHA1(4a9bd61fbdce9441753c5921f95ead5c4655957e) ) // 3-bpr
+ ROM_LOAD( "b.1d", 0x200, 0x100, CRC(60d2ab41) SHA1(e58a54f2aaee5c07136d5437e513d61fb18fbd9f) ) // 1-bpr
+ROM_END
+
+ROM_START( exerizerb )
+ ROM_REGION( 0x10000, "maincpu", 0 ) // Z80 code
+ ROM_LOAD( "1-a", 0x00000, 0x8000, CRC(5df72a5d) SHA1(ca35ac06f3702fd650a584da2f442fbc61c00fce) )
+ ROM_LOAD( "skyfox2.bin", 0x08000, 0x8000, CRC(e15e0263) SHA1(005934327834aed46b17161aef82117ee508e9c4) ) // 1-b
+
+ ROM_REGION( 0x10000, "audiocpu", 0 ) // Z80 code
+ ROM_LOAD( "skyfox9.bin", 0x00000, 0x8000, CRC(0b283bf5) SHA1(5b14d0beea689ee7e9174017e5a127435df4fbe3) ) // 1-i
+
+ ROM_REGION( 0x60000, "sprites", 0 )
+ ROM_LOAD( "1-c", 0x00000, 0x10000, CRC(450e9381) SHA1(f99b2ca73f1e4ba91b8066bb6d28d33b66a3ee81) )
+ ROM_LOAD( "skyfox4.bin", 0x10000, 0x10000, CRC(358053bb) SHA1(589e3270eda0d44e73fbc7ac06e782f332920b39) ) // 1-d
+ ROM_LOAD( "1-e", 0x20000, 0x10000, CRC(50a38c60) SHA1(a4b8d530914d6c85b15940a7821b4365068de668) )
+ ROM_LOAD( "skyfox6.bin", 0x30000, 0x10000, CRC(cc37e15d) SHA1(80806df6185f7b8c2d3ab98420ca514df3e63c8d) ) // 1-f
+ ROM_LOAD( "1-g", 0x40000, 0x10000, CRC(c9bbfe5c) SHA1(ce3f7d32baa8bb0bfc110877b5b5f4648ee959ac) )
+ ROM_LOAD( "skyfox8.bin", 0x50000, 0x10000, CRC(0e3edc49) SHA1(3d1c59ecaabe1c9517203b7e814db41d5cff0cd4) ) // 1-h
+
+ ROM_REGION( 0x08000, "tiles", 0 )
+ ROM_LOAD( "skyfox10.bin", 0x0000, 0x8000, CRC(19f58f9c) SHA1(6887216243b47152129448cbb4c7d52309feed03) ) // 1-j
+
+ ROM_REGION( 0x300, "proms", 0 ) // colors
+ ROM_LOAD( "sfoxrprm.bin", 0x000, 0x100, CRC(79913c7f) SHA1(e64e6a3eb55f37984cb2597c8ffba6bc3bad49c7) ) // 2-bpr
+ ROM_LOAD( "sfoxgprm.bin", 0x100, 0x100, CRC(fb73d434) SHA1(4a9bd61fbdce9441753c5921f95ead5c4655957e) ) // 3-bpr
+ ROM_LOAD( "sfoxbprm.bin", 0x200, 0x100, CRC(60d2ab41) SHA1(e58a54f2aaee5c07136d5437e513d61fb18fbd9f) ) // 1-bpr
+ROM_END
+
+
+// Untangle the graphics: cut each 32x32x8 tile in 16 8x8x8 tiles
+void skyfox_state::init_skyfox()
+{
+ uint8_t *rom = memregion("sprites")->base();
+ uint8_t *end = rom + memregion("sprites")->bytes();
+ uint8_t buf[32 * 32];
+
+ while (rom < end)
+ {
+ for (int i = 0; i < (32 * 32); i++)
+ buf[i] = rom[(i % 8) + ((i / 8) % 8) * 32 + ((i / 64) % 4) * 8 + (i / 256) * 256];
+
+ memcpy(rom, buf, 32 * 32);
+ rom += 32 * 32;
+ }
+}
+
+} // anonymous namespace
+
+
+GAME( 1987, skyfox, 0, skyfox, skyfox, skyfox_state, init_skyfox, ROT90, "Jaleco (Nichibutsu USA license)", "Sky Fox", MACHINE_SUPPORTS_SAVE )
+GAME( 1987, exerizer, skyfox, skyfox, skyfox, skyfox_state, init_skyfox, ROT90, "Jaleco", "Exerizer (Japan)", MACHINE_SUPPORTS_SAVE )
+GAME( 1987, exerizerb, skyfox, skyfox, skyfox, skyfox_state, init_skyfox, ROT90, "bootleg", "Exerizer (bootleg)", MACHINE_SUPPORTS_SAVE )