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diff --git a/src/mame/drivers/exerion.cpp b/src/mame/drivers/exerion.cpp
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+// license:BSD-3-Clause
+// copyright-holders:Aaron Giles
+/***************************************************************************
+
+ Jaleco Exerion hardware
+
+****************************************************************************
+
+ Exerion is a unique driver in that it has idiosyncracies that are straight
+ out of Bizarro World. I submit for your approval:
+
+ * The mystery reads from $d802 - timer-based protection?
+ * The freakish graphics encoding scheme, which no other MAME-supported game uses
+ * The sprite-ram, and all the funky parameters that go along with it
+
+
+Stephh's notes (based on the games Z80 code and some tests) :
+
+1) 'exerion'
+
+ - The coin insertion routine (code at 0x0066) is buggy as you get a credit
+ on first coin after initialisation even if you need more than 1 coin for 1 credit :
+ * when coinage is set to 2C_1C, you get a credit when inserting
+ 1, 2, 4, 6 ... multiples of 2 coins
+ * when coinage is set to 3C_1C, you get a credit when inserting
+ 1, 3, 6, 9 ... multiples of 3 coins
+ * when coinage is set to 4C_1C, you get a credit when inserting
+ 1, 4, 8, 12 ... multiples of 4 coins
+ * when coinage is set to 5C_1C, you get a credit when inserting
+ 1, 5, 10, 15 ... multiples of 5 coins
+ - According to the Dip Switches sheet, difficulty is handled by DSW0 bits 5 and 6.
+ In fact, bit 6 determines the overall difficulty (0x40 = OFF easy - 0x00 = ON hard)
+ while bit 5 determines enemies' number of bullets (0x20 = OFF for less bullets and
+ 0x00 = ON for more bullets).
+ - When starting a 1 or 2 players game, 2 checksums are computed (code at 0x00e4) :
+ one from 0x05f0 to 0x06ee (stored at 0x6030), one from 0x00d8 to 0x01d6 (stored
+ at 0x6031). Contents of 0x0625 is also stored to 0x6032.
+ - Each time before attract mode sequence starts, a checksum is computed from 0x0000
+ to 0x1fff (code at 0x28b8) if 17th score in the high-score table is not 0.
+ If checksum doesn't match the hardcoded value (0xb5), you get one more credit
+ and you are allowed to continue the game with an extra life (score, charge and
+ level are not reset to original values).
+ - At the beginning of each life of each player, a checksum is computed from 0x4100
+ to 0x4dff (code at 0x07d8) if 1st score in the high-score table is >= 80000.
+ If checksum doesn't match the hardcoded value (0x63), you get 255 credits !
+ Notice that the displayed number of credits won't be correct as the game
+ isn't suppose to allow more than 9 credits.
+ - In a 2 players game, when player changes, if player it was player 2 turn,
+ values from 0x6030 to 0x6032 (see above) are compared with hard-coded values
+ (code at 0x04c8). If they don't match respectively 0xfe, 0xb3 and 0x4c,
+ and if 9th score in the high-score table is not 0, the game resets !
+ - Before entering player's initials, a checksum is computed from 0x5f00 to 0x5fff
+ (code at 0x5bd0) if player has reached level 6 (2nd kind of enemies after bonus
+ stage). If checksum doesn't match the hardcoded value (0x9a), the game resets !
+ - There is sort of protection routine at 0x4120 which has an effect when
+ player loses a life on reaching first bonus stage or after. If values read
+ from 0x6008 to 0x600b don't match values from ROM area 0x33c0-0x33ff,
+ the game resets. See 'exerion_protection_r' read handler.
+ - There is an unknown routine at 0x5f70 which is called when the game boots
+ which reads value from 0x600c and see if it matches a hardcoded value (0xbe).
+ If they don't match, the game resets after displaying the high-scores table.
+ - There is another unknown routine at 0x414e which is called when a game is over
+ which reads value from 0x600c and see if it matches value from ROM area
+ 0x4000-0x400f based on internal timer value for a game at 0x604a. If they don't
+ match, its only effect is to set lives to 0, which is always the case when the
+ game is over, so it doesn't seem to have any real effect.
+ Was it supposed to be called at another time ?
+ - The routine at 0x5f90 writes to addresses 0x6008-0x600c values read from AY port A
+ (one write after one read). This routine is called by the 2 unknown routines.
+
+2) 'exeriont'
+
+ - The coin insertion routine is fixed in this set (see the subttle changes
+ in the code from 0x0077 to 0x0082).
+ - The routine at 0x28b8 is the same as in 'exerion' (same hardcoded value).
+ - The routine at 0x07d8 is the same as in 'exerion' (same hardcoded value).
+ - The routine at 0x04c8 is the same as in 'exerion' (same hardcoded values).
+ - The routine at 0x5bd0 is the same as in 'exerion' (same hardcoded value).
+ - The routine at 0x4120 is the same as in 'exerion', but data from 0x33c0 to 0x33ff
+ is slightly different :
+
+ address exerion exeriont
+ 0x33c1: 0x3e 0x36
+ 0x33c2: 0x37 0x32
+ 0x33c8: 0x76 0x7e
+ 0x33ca: 0x32 0x26
+ 0x33cb: 0x34 0x1e
+ 0x33d5: 0x07 0x3f
+ 0x33fc: 0x76 0x40
+ 0x33fd: 0x37 0x00
+ 0x33fe: 0x32 0x00
+ 0x33ff: 0x26 0x00
+
+ - The routine at 0x5f70 is similar to the one in 'exerion' (hardcoded value = 0x9e).
+ - The routine at 0x414e is the same as in 'exerion', but data from 0x4000 to 0x400f
+ is slightly different :
+
+ address exerion exeriont
+ 0x4002: 0xb2 0x9e
+ 0x400f: 0xbe 0x9e
+
+ - The routine at 0x5f90 is the same as in 'exerion'.
+
+3) 'exerionb'
+
+ - This set is based on 'exerion' as the coin insertion routine at 0x0066
+ (and as a consequence the bug) is the same.
+ - The routine at 0x28b8 has been patched, so you can never see the "continue" feature.
+ - The routine at 0x07d8 has been patched, so you can never get 255 credits.
+ - The routine at 0x04c8 and the computed values from 0x6030 to 0x6032 are surprisingly
+ the same as in 'exerion'.
+ - The routine at 0x5bd0 has been patched, so the game can't reset.
+ - The "protection" routine at 0x4120 has been patched, so the game can't reset.
+ - The first unknown routine at 0x5f70 has been patched, so the game can't reset.
+ - The second unknown routine at 0x414e has been patched, so lives can't be set to 0.
+ - The routine at 0x5f90 is completely different : it reads values from AY port A,
+ but nothing is written to addresses 0x6008-0x600c, and there are lots of writes
+ to AY port B (0xd001) due to extra code at 0x0050 and extra data at 0x0040.
+
+***************************************************************************/
+
+#include "emu.h"
+#include "cpu/z80/z80.h"
+#include "includes/exerion.h"
+#include "sound/ay8910.h"
+
+
+/*************************************
+ *
+ * Interrupts & inputs
+ *
+ *************************************/
+
+/* Players inputs are muxed at 0xa000 */
+CUSTOM_INPUT_MEMBER(exerion_state::exerion_controls_r)
+{
+ static const char *const inname[2] = { "P1", "P2" };
+ return ioport(inname[m_cocktail_flip])->read() & 0x3f;
+}
+
+
+INPUT_CHANGED_MEMBER(exerion_state::coin_inserted)
+{
+ /* coin insertion causes an NMI */
+ m_maincpu->set_input_line(INPUT_LINE_NMI, newval ? CLEAR_LINE : ASSERT_LINE);
+}
+
+
+
+/*************************************
+ *
+ * Protection??
+ *
+ *************************************/
+
+/* This is the first of many Exerion "features". No clue if it's */
+/* protection or some sort of timer. */
+READ8_MEMBER(exerion_state::exerion_porta_r)
+{
+ m_porta ^= 0x40;
+ return m_porta;
+}
+
+
+WRITE8_MEMBER(exerion_state::exerion_portb_w)
+{
+ /* pull the expected value from the ROM */
+ m_porta = memregion("maincpu")->base()[0x5f76];
+ m_portb = data;
+
+ logerror("Port B = %02X\n", data);
+}
+
+
+READ8_MEMBER(exerion_state::exerion_protection_r)
+{
+ if (space.device().safe_pc() == 0x4143)
+ return memregion("maincpu")->base()[0x33c0 + (m_main_ram[0xd] << 2) + offset];
+ else
+ return m_main_ram[0x8 + offset];
+}
+
+
+
+/*************************************
+ *
+ * Main CPU memory handlers
+ *
+ *************************************/
+
+static ADDRESS_MAP_START( main_map, AS_PROGRAM, 8, exerion_state )
+ AM_RANGE(0x0000, 0x5fff) AM_ROM
+ AM_RANGE(0x6008, 0x600b) AM_READ(exerion_protection_r)
+ AM_RANGE(0x6000, 0x67ff) AM_RAM AM_SHARE("main_ram")
+ AM_RANGE(0x8000, 0x87ff) AM_RAM AM_SHARE("videoram")
+ AM_RANGE(0x8800, 0x887f) AM_RAM AM_SHARE("spriteram")
+ AM_RANGE(0x8800, 0x8bff) AM_RAM
+ AM_RANGE(0xa000, 0xa000) AM_READ_PORT("IN0")
+ AM_RANGE(0xa800, 0xa800) AM_READ_PORT("DSW0")
+ AM_RANGE(0xb000, 0xb000) AM_READ_PORT("DSW1")
+ AM_RANGE(0xc000, 0xc000) AM_WRITE(exerion_videoreg_w)
+ AM_RANGE(0xc800, 0xc800) AM_WRITE(soundlatch_byte_w)
+ AM_RANGE(0xd000, 0xd001) AM_DEVWRITE("ay1", ay8910_device, address_data_w)
+ AM_RANGE(0xd800, 0xd801) AM_DEVWRITE("ay2", ay8910_device, address_data_w)
+ AM_RANGE(0xd802, 0xd802) AM_DEVREAD("ay2", ay8910_device, data_r)
+ADDRESS_MAP_END
+
+
+
+/*************************************
+ *
+ * Sub CPU memory handlers
+ *
+ *************************************/
+
+static ADDRESS_MAP_START( sub_map, AS_PROGRAM, 8, exerion_state )
+ AM_RANGE(0x0000, 0x1fff) AM_ROM
+ AM_RANGE(0x4000, 0x47ff) AM_RAM
+ AM_RANGE(0x6000, 0x6000) AM_READ(soundlatch_byte_r)
+ AM_RANGE(0x8000, 0x800c) AM_WRITE(exerion_video_latch_w)
+ AM_RANGE(0xa000, 0xa000) AM_READ(exerion_video_timing_r)
+ADDRESS_MAP_END
+
+
+
+/*************************************
+ *
+ * Port definitions
+ *
+ *************************************/
+
+/* verified from Z80 code */
+static INPUT_PORTS_START( exerion )
+ PORT_START("IN0")
+ PORT_BIT( 0x3f, IP_ACTIVE_HIGH, IPT_SPECIAL ) PORT_CUSTOM_MEMBER(DEVICE_SELF, exerion_state,exerion_controls_r, (void *)0)
+ PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_START1 )
+ PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_START2 )
+
+ PORT_START("DSW0")
+ PORT_DIPNAME( 0x07, 0x02, DEF_STR( Lives ) )
+ PORT_DIPSETTING( 0x00, "1" )
+ PORT_DIPSETTING( 0x01, "2" )
+ PORT_DIPSETTING( 0x02, "3" )
+ PORT_DIPSETTING( 0x03, "4" )
+ PORT_DIPSETTING( 0x04, "5" )
+// PORT_DIPSETTING( 0x05, "5" ) /* duplicated setting */
+// PORT_DIPSETTING( 0x06, "5" ) /* duplicated setting */
+ PORT_DIPSETTING( 0x07, "254 (Cheat)")
+ PORT_DIPNAME( 0x18, 0x00, DEF_STR( Bonus_Life ) )
+ PORT_DIPSETTING( 0x00, "10000" )
+ PORT_DIPSETTING( 0x08, "20000" )
+ PORT_DIPSETTING( 0x10, "30000" )
+ PORT_DIPSETTING( 0x18, "40000" )
+ PORT_DIPNAME( 0x60, 0x00, DEF_STR( Difficulty ) ) /* see notes */
+ PORT_DIPSETTING( 0x00, DEF_STR( Easy ) )
+ PORT_DIPSETTING( 0x20, DEF_STR( Medium ) )
+ PORT_DIPSETTING( 0x40, DEF_STR( Hard ) )
+ PORT_DIPSETTING( 0x60, DEF_STR( Hardest ) )
+ PORT_DIPNAME( 0x80, 0x00, DEF_STR( Cabinet ) )
+ PORT_DIPSETTING( 0x00, DEF_STR( Upright ) )
+ PORT_DIPSETTING( 0x80, DEF_STR( Cocktail ) )
+
+ PORT_START("DSW1")
+ PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_CUSTOM ) PORT_VBLANK("screen")
+ PORT_DIPNAME( 0x0e, 0x00, DEF_STR( Coinage ) ) /* see notes */
+ 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 ) )
+ PORT_BIT( 0xf0, IP_ACTIVE_LOW, IPT_UNUSED )
+
+ PORT_START("COIN")
+ PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_COIN1 ) PORT_CHANGED_MEMBER(DEVICE_SELF, exerion_state,coin_inserted, 0)
+
+ PORT_START("P1") /* fake input port */
+ PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_8WAY
+ PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_8WAY
+ PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_8WAY
+ PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_8WAY
+ PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_BUTTON1 )
+ PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_BUTTON2 )
+
+ PORT_START("P2") /* fake input port */
+ PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_8WAY PORT_COCKTAIL
+ PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_8WAY PORT_COCKTAIL
+ PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_8WAY PORT_COCKTAIL
+ PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_8WAY PORT_COCKTAIL
+ PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_COCKTAIL
+ PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_COCKTAIL
+INPUT_PORTS_END
+
+
+
+/*************************************
+ *
+ * Graphics layouts
+ *
+ *************************************/
+
+static const gfx_layout charlayout =
+{
+ 8,8,
+ RGN_FRAC(1,1),
+ 2,
+ { 0, 4 },
+ { 3, 2, 1, 0, 8+3, 8+2, 8+1, 8+0 },
+ { 16*0, 16*1, 16*2, 16*3, 16*4, 16*5, 16*6, 16*7 },
+ 16*8
+};
+
+
+/* 16 x 16 sprites -- requires reorganizing characters in init_exerion() */
+static const gfx_layout spritelayout =
+{
+ 16,16,
+ RGN_FRAC(1,1),
+ 2,
+ { 0, 4 },
+ { 3, 2, 1, 0, 8+3, 8+2, 8+1, 8+0,
+ 16+3, 16+2, 16+1, 16+0, 24+3, 24+2, 24+1, 24+0 },
+ { 32*0, 32*1, 32*2, 32*3, 32*4, 32*5, 32*6, 32*7,
+ 32*8, 32*9, 32*10, 32*11, 32*12, 32*13, 32*14, 32*15 },
+ 64*8
+};
+
+
+static GFXDECODE_START( exerion )
+ GFXDECODE_ENTRY( "gfx1", 0, charlayout, 0, 64 )
+ GFXDECODE_ENTRY( "gfx2", 0, spritelayout, 256, 64 )
+ GFXDECODE_SCALE( "gfx2", 0, spritelayout, 256, 64, 2, 2 )
+GFXDECODE_END
+
+
+/*************************************
+ *
+ * Machine drivers
+ *
+ *************************************/
+
+void exerion_state::machine_start()
+{
+ save_item(NAME(m_porta));
+ save_item(NAME(m_portb));
+ save_item(NAME(m_cocktail_flip));
+ save_item(NAME(m_char_palette));
+ save_item(NAME(m_sprite_palette));
+ save_item(NAME(m_char_bank));
+ save_item(NAME(m_background_latches));
+}
+
+void exerion_state::machine_reset()
+{
+ int i;
+
+ m_porta = 0;
+ m_portb = 0;
+ m_cocktail_flip = 0;
+ m_char_palette = 0;
+ m_sprite_palette = 0;
+ m_char_bank = 0;
+
+ for (i = 0; i < 13; i++)
+ m_background_latches[i] = 0;
+}
+
+static MACHINE_CONFIG_START( exerion, exerion_state )
+
+ MCFG_CPU_ADD("maincpu", Z80, EXERION_CPU_CLOCK)
+ MCFG_CPU_PROGRAM_MAP(main_map)
+
+ MCFG_CPU_ADD("sub", Z80, EXERION_CPU_CLOCK)
+ MCFG_CPU_PROGRAM_MAP(sub_map)
+
+
+ /* video hardware */
+ MCFG_SCREEN_ADD("screen", RASTER)
+ MCFG_SCREEN_RAW_PARAMS(EXERION_PIXEL_CLOCK, EXERION_HTOTAL, EXERION_HBEND, EXERION_HBSTART, EXERION_VTOTAL, EXERION_VBEND, EXERION_VBSTART)
+ MCFG_SCREEN_UPDATE_DRIVER(exerion_state, screen_update_exerion)
+ MCFG_SCREEN_PALETTE("palette")
+
+ MCFG_GFXDECODE_ADD("gfxdecode", "palette", exerion)
+ MCFG_PALETTE_ADD("palette", 256*3)
+ MCFG_PALETTE_INDIRECT_ENTRIES(32)
+ MCFG_PALETTE_INIT_OWNER(exerion_state, exerion)
+
+ /* audio hardware */
+ MCFG_SPEAKER_STANDARD_MONO("mono")
+
+ MCFG_SOUND_ADD("ay1", AY8910, EXERION_AY8910_CLOCK)
+ MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.30)
+
+ MCFG_SOUND_ADD("ay2", AY8910, EXERION_AY8910_CLOCK)
+ MCFG_AY8910_PORT_A_READ_CB(READ8(exerion_state, exerion_porta_r))
+ MCFG_AY8910_PORT_B_WRITE_CB(WRITE8(exerion_state, exerion_portb_w))
+ MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.30)
+MACHINE_CONFIG_END
+
+
+
+/*************************************
+ *
+ * ROM definitions
+ *
+ *************************************/
+
+ROM_START( exerion )
+ ROM_REGION( 0x6000, "maincpu", 0 )
+ ROM_LOAD( "exerion.07", 0x0000, 0x2000, CRC(4c78d57d) SHA1(ac702e9ad2bc05493fb1355858667c31c36acfe4) )
+ ROM_LOAD( "exerion.08", 0x2000, 0x2000, CRC(dcadc1df) SHA1(91388f617cfaa4289ca1c84c697fcfdd8834ae15) )
+ ROM_LOAD( "exerion.09", 0x4000, 0x2000, CRC(34cc4d14) SHA1(511c9de038f7bcaf6f7c96f2cbbe50a80673fa72) )
+
+ ROM_REGION( 0x2000, "sub", 0 ) /* 64k for the second CPU */
+ ROM_LOAD( "exerion.05", 0x0000, 0x2000, CRC(32f6bff5) SHA1(a4d0289f9d1d9eea7ca9a32a0616af48da74b401) )
+
+ ROM_REGION( 0x02000, "gfx1", 0 )
+ ROM_LOAD( "exerion.06", 0x00000, 0x2000, CRC(435a85a4) SHA1(f6846bfee11df754405d4d796e7d8ac0321b6eb6) ) /* fg chars */
+
+ ROM_REGION( 0x04000, "gfx2", 0 )
+ ROM_LOAD( "exerion.11", 0x00000, 0x2000, CRC(f0633a09) SHA1(8989bcb12abadde34777f7c189cfa6e2dfe92d62) ) /* sprites */
+ ROM_LOAD( "exerion.10", 0x02000, 0x2000, CRC(80312de0) SHA1(4fa3bb9d5c62e41a54e8909f8d3b47637137e913) )
+
+ ROM_REGION( 0x08000, "gfx3", 0 )
+ ROM_LOAD( "exerion.03", 0x00000, 0x2000, CRC(790595b8) SHA1(8016ac2394b25db38e962bcff4805380082f6683) ) /* bg data */
+ ROM_LOAD( "exerion.04", 0x02000, 0x2000, CRC(d7abd0b9) SHA1(ca6413ecd324cf84e11b703a4eda2c1e6d28ff15) )
+ ROM_LOAD( "exerion.01", 0x04000, 0x2000, CRC(5bb755cb) SHA1(ec92c518c116a78dbb23381468cefb3f930212cc) )
+ ROM_LOAD( "exerion.02", 0x06000, 0x2000, CRC(a7ecbb70) SHA1(3c359d5bb21290a45d3eb18fea2b1f9439b931be) )
+
+ ROM_REGION( 0x0420, "proms", 0 )
+ ROM_LOAD( "exerion.e1", 0x0000, 0x0020, CRC(2befcc20) SHA1(a24d3f691413378fde545a6ddcef7e5118e74019) ) /* palette */
+ ROM_LOAD( "exerion.i8", 0x0020, 0x0100, CRC(31db0e08) SHA1(1041a778e86d3fe6f057cf40a0a08b30760f3887) ) /* fg char lookup table */
+ ROM_LOAD( "exerion.h10", 0x0120, 0x0100, CRC(63b4c555) SHA1(30243041be4fa77ada71e8b29d721cad51640c29) ) /* sprite lookup table */
+ ROM_LOAD( "exerion.i3", 0x0220, 0x0100, CRC(fe72ab79) SHA1(048a72e6db4768df687df927acaa70ef906b3dc0) ) /* bg char lookup table */
+ ROM_LOAD( "exerion.k4", 0x0320, 0x0100, CRC(ffc2ba43) SHA1(03be1c41d6ac3fc11439caef04ef5ffa60d6aec4) ) /* bg char mixer */
+ROM_END
+
+
+ROM_START( exeriont )
+ ROM_REGION( 0x6000, "maincpu", 0 )
+ ROM_LOAD( "prom5.4p", 0x0000, 0x4000, CRC(58b4dc1b) SHA1(3e34d1eda0b0537dac1062e96259d4cc7c64049c) )
+ ROM_LOAD( "prom6.4s", 0x4000, 0x2000, CRC(fca18c2d) SHA1(31077dada3ed4aa2e26af933f589e01e0c71e5cd) )
+
+ ROM_REGION( 0x2000, "sub", 0 ) /* 64k for the second CPU */
+ ROM_LOAD( "exerion.05", 0x0000, 0x2000, CRC(32f6bff5) SHA1(a4d0289f9d1d9eea7ca9a32a0616af48da74b401) )
+
+ ROM_REGION( 0x02000, "gfx1", 0 )
+ ROM_LOAD( "exerion.06", 0x00000, 0x2000, CRC(435a85a4) SHA1(f6846bfee11df754405d4d796e7d8ac0321b6eb6) ) /* fg chars */
+
+ ROM_REGION( 0x04000, "gfx2", 0 )
+ ROM_LOAD( "exerion.11", 0x00000, 0x2000, CRC(f0633a09) SHA1(8989bcb12abadde34777f7c189cfa6e2dfe92d62) ) /* sprites */
+ ROM_LOAD( "exerion.10", 0x02000, 0x2000, CRC(80312de0) SHA1(4fa3bb9d5c62e41a54e8909f8d3b47637137e913) )
+
+ ROM_REGION( 0x08000, "gfx3", 0 )
+ ROM_LOAD( "exerion.03", 0x00000, 0x2000, CRC(790595b8) SHA1(8016ac2394b25db38e962bcff4805380082f6683) ) /* bg data */
+ ROM_LOAD( "exerion.04", 0x02000, 0x2000, CRC(d7abd0b9) SHA1(ca6413ecd324cf84e11b703a4eda2c1e6d28ff15) )
+ ROM_LOAD( "exerion.01", 0x04000, 0x2000, CRC(5bb755cb) SHA1(ec92c518c116a78dbb23381468cefb3f930212cc) )
+ ROM_LOAD( "exerion.02", 0x06000, 0x2000, CRC(a7ecbb70) SHA1(3c359d5bb21290a45d3eb18fea2b1f9439b931be) )
+
+ ROM_REGION( 0x0420, "proms", 0 )
+ ROM_LOAD( "exerion.e1", 0x0000, 0x0020, CRC(2befcc20) SHA1(a24d3f691413378fde545a6ddcef7e5118e74019) ) /* palette */
+ ROM_LOAD( "exerion.i8", 0x0020, 0x0100, CRC(31db0e08) SHA1(1041a778e86d3fe6f057cf40a0a08b30760f3887) ) /* fg char lookup table */
+ ROM_LOAD( "exerion.h10", 0x0120, 0x0100, CRC(63b4c555) SHA1(30243041be4fa77ada71e8b29d721cad51640c29) ) /* sprite lookup table */
+ ROM_LOAD( "exerion.i3", 0x0220, 0x0100, CRC(fe72ab79) SHA1(048a72e6db4768df687df927acaa70ef906b3dc0) ) /* bg char lookup table */
+ ROM_LOAD( "exerion.k4", 0x0320, 0x0100, CRC(ffc2ba43) SHA1(03be1c41d6ac3fc11439caef04ef5ffa60d6aec4) ) /* bg char mixer */
+ROM_END
+
+
+ROM_START( exerionb )
+ ROM_REGION( 0x6000, "maincpu", 0 )
+ ROM_LOAD( "eb5.bin", 0x0000, 0x4000, CRC(da175855) SHA1(11ea46fd1d504e16e5ffc604d74c1ce210d6be1c) )
+ ROM_LOAD( "eb6.bin", 0x4000, 0x2000, CRC(0dbe2eff) SHA1(5b0e5e8453619beec46c4350d1b2ed571fe3dc24) )
+
+ ROM_REGION( 0x2000, "sub", 0 ) /* 64k for the second CPU */
+ ROM_LOAD( "exerion.05", 0x0000, 0x2000, CRC(32f6bff5) SHA1(a4d0289f9d1d9eea7ca9a32a0616af48da74b401) )
+
+ ROM_REGION( 0x02000, "gfx1", 0 )
+ ROM_LOAD( "exerion.06", 0x00000, 0x2000, CRC(435a85a4) SHA1(f6846bfee11df754405d4d796e7d8ac0321b6eb6) ) /* fg chars */
+
+ ROM_REGION( 0x04000, "gfx2", 0 )
+ ROM_LOAD( "exerion.11", 0x00000, 0x2000, CRC(f0633a09) SHA1(8989bcb12abadde34777f7c189cfa6e2dfe92d62) ) /* sprites */
+ ROM_LOAD( "exerion.10", 0x02000, 0x2000, CRC(80312de0) SHA1(4fa3bb9d5c62e41a54e8909f8d3b47637137e913) )
+
+ ROM_REGION( 0x08000, "gfx3", 0 )
+ ROM_LOAD( "exerion.03", 0x00000, 0x2000, CRC(790595b8) SHA1(8016ac2394b25db38e962bcff4805380082f6683) ) /* bg data */
+ ROM_LOAD( "exerion.04", 0x02000, 0x2000, CRC(d7abd0b9) SHA1(ca6413ecd324cf84e11b703a4eda2c1e6d28ff15) )
+ ROM_LOAD( "exerion.01", 0x04000, 0x2000, CRC(5bb755cb) SHA1(ec92c518c116a78dbb23381468cefb3f930212cc) )
+ ROM_LOAD( "exerion.02", 0x06000, 0x2000, CRC(a7ecbb70) SHA1(3c359d5bb21290a45d3eb18fea2b1f9439b931be) )
+
+ ROM_REGION( 0x0420, "proms", 0 )
+ ROM_LOAD( "exerion.e1", 0x0000, 0x0020, CRC(2befcc20) SHA1(a24d3f691413378fde545a6ddcef7e5118e74019) ) /* palette */
+ ROM_LOAD( "exerion.i8", 0x0020, 0x0100, CRC(31db0e08) SHA1(1041a778e86d3fe6f057cf40a0a08b30760f3887) ) /* fg char lookup table */
+ ROM_LOAD( "exerion.h10", 0x0120, 0x0100, CRC(63b4c555) SHA1(30243041be4fa77ada71e8b29d721cad51640c29) ) /* sprite lookup table */
+ ROM_LOAD( "exerion.i3", 0x0220, 0x0100, CRC(fe72ab79) SHA1(048a72e6db4768df687df927acaa70ef906b3dc0) ) /* bg char lookup table */
+ ROM_LOAD( "exerion.k4", 0x0320, 0x0100, CRC(ffc2ba43) SHA1(03be1c41d6ac3fc11439caef04ef5ffa60d6aec4) ) /* bg char mixer */
+ROM_END
+
+
+/*************************************
+ *
+ * Driver initialization
+ *
+ *************************************/
+
+DRIVER_INIT_MEMBER(exerion_state,exerion)
+{
+ UINT32 oldaddr, newaddr, length;
+ UINT8 *src, *dst;
+
+ /* allocate some temporary space */
+ dynamic_buffer temp(0x10000);
+
+ /* make a temporary copy of the character data */
+ src = &temp[0];
+ dst = memregion("gfx1")->base();
+ length = memregion("gfx1")->bytes();
+ memcpy(src, dst, length);
+
+ /* decode the characters */
+ /* the bits in the ROM are ordered: n8-n7 n6 n5 n4-v2 v1 v0 n3-n2 n1 n0 h2 */
+ /* we want them ordered like this: n8-n7 n6 n5 n4-n3 n2 n1 n0-v2 v1 v0 h2 */
+ for (oldaddr = 0; oldaddr < length; oldaddr++)
+ {
+ newaddr = ((oldaddr ) & 0x1f00) | /* keep n8-n4 */
+ ((oldaddr << 3) & 0x00f0) | /* move n3-n0 */
+ ((oldaddr >> 4) & 0x000e) | /* move v2-v0 */
+ ((oldaddr ) & 0x0001); /* keep h2 */
+ dst[newaddr] = src[oldaddr];
+ }
+
+ /* make a temporary copy of the sprite data */
+ src = &temp[0];
+ dst = memregion("gfx2")->base();
+ length = memregion("gfx2")->bytes();
+ memcpy(src, dst, length);
+
+ /* decode the sprites */
+ /* the bits in the ROMs are ordered: n9 n8 n3 n7-n6 n5 n4 v3-v2 v1 v0 n2-n1 n0 h3 h2 */
+ /* we want them ordered like this: n9 n8 n7 n6-n5 n4 n3 n2-n1 n0 v3 v2-v1 v0 h3 h2 */
+ for (oldaddr = 0; oldaddr < length; oldaddr++)
+ {
+ newaddr = ((oldaddr << 1) & 0x3c00) | /* move n7-n4 */
+ ((oldaddr >> 4) & 0x0200) | /* move n3 */
+ ((oldaddr << 4) & 0x01c0) | /* move n2-n0 */
+ ((oldaddr >> 3) & 0x003c) | /* move v3-v0 */
+ ((oldaddr ) & 0xc003); /* keep n9-n8 h3-h2 */
+ dst[newaddr] = src[oldaddr];
+ }
+}
+
+
+DRIVER_INIT_MEMBER(exerion_state,exerionb)
+{
+ UINT8 *ram = memregion("maincpu")->base();
+ int addr;
+
+ /* the program ROMs have data lines D1 and D2 swapped. Decode them. */
+ for (addr = 0; addr < 0x6000; addr++)
+ ram[addr] = (ram[addr] & 0xf9) | ((ram[addr] & 2) << 1) | ((ram[addr] & 4) >> 1);
+
+ /* also convert the gfx as in Exerion */
+ DRIVER_INIT_CALL(exerion);
+}
+
+
+
+/*************************************
+ *
+ * Game drivers
+ *
+ *************************************/
+
+GAME( 1983, exerion, 0, exerion, exerion, exerion_state, exerion, ROT90, "Jaleco", "Exerion", MACHINE_SUPPORTS_SAVE )
+GAME( 1983, exeriont, exerion, exerion, exerion, exerion_state, exerion, ROT90, "Jaleco (Taito America license)", "Exerion (Taito)", MACHINE_SUPPORTS_SAVE )
+GAME( 1983, exerionb, exerion, exerion, exerion, exerion_state, exerionb, ROT90, "bootleg", "Exerion (bootleg)", MACHINE_SUPPORTS_SAVE )