diff options
Diffstat (limited to 'src/mame/drivers/megaplay.c')
-rw-r--r-- | src/mame/drivers/megaplay.c | 1078 |
1 files changed, 1078 insertions, 0 deletions
diff --git a/src/mame/drivers/megaplay.c b/src/mame/drivers/megaplay.c new file mode 100644 index 00000000000..d0e2db94ecf --- /dev/null +++ b/src/mame/drivers/megaplay.c @@ -0,0 +1,1078 @@ +/* Sega MegaPlay + + changelog: + + 22 Sept 2007 - Started updating this to use the new Megadrive code, + fixing issues with Mazin Wars + Grand Slam. + However I'm still not convinced that the handling of + the Megaplay side of things is correct at all, and + we're still hanging off the old SMS vdp code and + IO code. + +*/ + +/* + +About MegaPlay: + +Megaplay games are specially designed Genesis games, produced for arcade use. + +The code of these games has significant modifications when compared to the Genesis +releases and in many cases the games are cut-down versions of the games that were +released for the home system. For example, Sonic has less zones, and no special +stages, thus making it impossible to get all the chaos emeralds. Zones also have a +strict timer. + +Coins buy you credits on Megaplay games, meaning if you lose all your lives the game is +over, like a regular Arcade game. + +Like the Megatech the Megaplay boards have an additional Z80 and SMS VDP chip when compared +to the standard Genesis hardware. In this case the additional hardware creates a layer +which is displayed as an overlay to the game screen. This layer contains basic text +such as Insert Coin, and the Megaplay Logo / Instructions during the attract loop. + +Communication between the various CPUs seems to be fairly complex and it is not fully +understood what is shared, where, and how. One of the BIOS sets doesn't work, maybe for +this reason. + +Only a handful of games were released for this system. + +*/ + +#include "driver.h" +#include "genesis.h" +#include "megadriv.h" + +#define MASTER_CLOCK 53693100 + +/* Megaplay BIOS specific */ +#define MP_ROM 0x10 +#define MP_GAME 0 + +static UINT32 bios_bank; // ROM bank selection +static UINT16 game_banksel; // Game bank selection +static UINT32 bios_mode = MP_ROM; // determines whether ROM banks or Game data + // is to read from 0x8000-0xffff +static UINT32 bios_width; // determines the way the game info ROM is read +UINT8 bios_ctrl[6]; +static UINT8 bios_6600; +UINT8 bios_6204; +static UINT8 bios_6403; +static UINT8 bios_6404; +static UINT8* ic3_ram; + +static UINT8* ic37_ram; +UINT16 *ic36_ram; + +//static UINT8 ic36_ram[0x4000]; + + +static UINT8 hintcount; /* line interrupt counter, decreased each scanline */ +extern UINT8 segae_vintpending; +extern UINT8 segae_hintpending; +extern UINT8 *segae_vdp_regs[]; /* pointer to vdp's registers */ + +// Interrupt handler - from drivers/segasyse.c +static INTERRUPT_GEN (megaplay_bios_irq) +{ + int sline; + sline = 261 - cpu_getiloops(); + + if (sline ==0) { + hintcount = segae_vdp_regs[0][10]; + } + + if (sline <= 192) { + +// if (sline != 192) segae_drawscanline(sline,1,1); + + if (sline == 192) + segae_vintpending = 1; + + if (hintcount == 0) { + hintcount = segae_vdp_regs[0][10]; + segae_hintpending = 1; + + if ((segae_vdp_regs[0][0] & 0x10)) { + cpunum_set_input_line(2, 0, HOLD_LINE); + return; + } + + } else { + hintcount--; + } + } + + if (sline > 192) { + hintcount = segae_vdp_regs[0][10]; + + if ( (sline<0xe0) && (segae_vintpending) ) { + cpunum_set_input_line(2, 0, HOLD_LINE); + } + } + +} + + +static UINT32 readpos = 1; // serial bank selection position (9-bit) + +#define MEGAPLAY_TEST \ + PORT_START \ + PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_SERVICE2 ) PORT_NAME("Select") PORT_CODE(KEYCODE_0) \ + PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_UNKNOWN ) PORT_NAME("0x6400 bit 1") PORT_CODE(KEYCODE_W) \ + PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_UNKNOWN ) PORT_NAME("0x6400 bit 2") PORT_CODE(KEYCODE_E) \ + PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_UNKNOWN ) PORT_NAME("0x6400 bit 3") PORT_CODE(KEYCODE_R) \ + PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_UNKNOWN ) PORT_NAME("0x6400 bit 4") PORT_CODE(KEYCODE_T) \ + PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_UNKNOWN ) PORT_NAME("0x6400 bit 5") PORT_CODE(KEYCODE_Y) \ + PORT_BIT( 0x40, IP_ACTIVE_HIGH, IPT_UNKNOWN ) PORT_NAME("0x6400 bit 6") PORT_CODE(KEYCODE_U) \ + PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_SERVICE ) PORT_NAME(DEF_STR( Test )) PORT_CODE(KEYCODE_F2) + +#define MEGAPLAY_COIN \ + PORT_START \ + PORT_BIT ( 0x01, IP_ACTIVE_LOW, IPT_COIN1 ) \ + PORT_BIT ( 0x02, IP_ACTIVE_LOW, IPT_COIN2 ) \ + PORT_BIT ( 0x04, IP_ACTIVE_HIGH, IPT_UNKNOWN ) \ + PORT_BIT ( 0x08, IP_ACTIVE_HIGH, IPT_UNKNOWN ) \ + PORT_BIT ( 0x10, IP_ACTIVE_LOW, IPT_SERVICE1 ) \ + PORT_BIT ( 0x20, IP_ACTIVE_LOW, IPT_UNKNOWN ) \ + PORT_BIT ( 0x40, IP_ACTIVE_LOW, IPT_START1 ) \ + PORT_BIT ( 0x80, IP_ACTIVE_LOW, IPT_START2 ) + +#define MEGAPLAY_DSWA \ + PORT_START \ + PORT_DIPNAME( 0x0f, 0x0f, "Coin slot 1" ) PORT_DIPLOCATION("SW1:1,2,3,4") \ + PORT_DIPSETTING( 0x07, DEF_STR( 4C_1C ) ) \ + PORT_DIPSETTING( 0x08, DEF_STR( 3C_1C ) ) \ + PORT_DIPSETTING( 0x09, DEF_STR( 2C_1C ) ) \ + PORT_DIPSETTING( 0x05, "2 coins/1 credit - 5 coins/3 credits - 6 coins/4 credits" ) \ + PORT_DIPSETTING( 0x04, "2 coins/1 credit - 4 coins/3 credits" ) \ + PORT_DIPSETTING( 0x0f, DEF_STR( 1C_1C ) ) \ + PORT_DIPSETTING( 0x06, DEF_STR( 2C_3C ) ) \ + PORT_DIPSETTING( 0x0e, DEF_STR( 1C_2C ) ) \ + PORT_DIPSETTING( 0x0d, DEF_STR( 1C_3C ) ) \ + PORT_DIPSETTING( 0x0c, DEF_STR( 1C_4C ) ) \ + PORT_DIPSETTING( 0x0b, DEF_STR( 1C_5C ) ) \ + PORT_DIPSETTING( 0x0a, DEF_STR( 1C_6C ) ) \ + PORT_DIPSETTING( 0x03, "1 coin/1 credit - 5 coins/6 credits" ) \ + PORT_DIPSETTING( 0x02, "1 coin/1 credit - 4 coins/5 credits" ) \ + PORT_DIPSETTING( 0x01, "1 coin/1 credit - 2 coins/3 credits" ) \ + PORT_DIPSETTING( 0x00, DEF_STR( Free_Play ) ) + +#define MEGAPLAY_DSWB \ + PORT_DIPNAME( 0xf0, 0xf0, "Coin slot 2" ) PORT_DIPLOCATION("SW2:1,2,3,4")\ + PORT_DIPSETTING( 0x70, DEF_STR( 4C_1C ) ) \ + PORT_DIPSETTING( 0x80, DEF_STR( 3C_1C ) ) \ + PORT_DIPSETTING( 0x90, DEF_STR( 2C_1C ) ) \ + PORT_DIPSETTING( 0x50, "2 coins/1 credit - 5 coins/3 credits - 6 coins/4 credits" ) \ + PORT_DIPSETTING( 0x40, "2 coins/1 credit - 4 coins/3 credits" ) \ + PORT_DIPSETTING( 0xf0, DEF_STR( 1C_1C ) ) \ + PORT_DIPSETTING( 0x60, DEF_STR( 2C_3C ) ) \ + PORT_DIPSETTING( 0xe0, DEF_STR( 1C_2C ) ) \ + PORT_DIPSETTING( 0xd0, DEF_STR( 1C_3C ) ) \ + PORT_DIPSETTING( 0xc0, DEF_STR( 1C_4C ) ) \ + PORT_DIPSETTING( 0xb0, DEF_STR( 1C_5C ) ) \ + PORT_DIPSETTING( 0xa0, DEF_STR( 1C_6C ) ) \ + PORT_DIPSETTING( 0x30, "1 coin/1 credit - 5 coins/6 credits" ) \ + PORT_DIPSETTING( 0x20, "1 coin/1 credit - 4 coins/5 credits" ) \ + PORT_DIPSETTING( 0x10, "1 coin/1 credit - 2 coins/3 credits" ) \ + PORT_DIPSETTING( 0x00, " 1 coin/1 credit" ) + +static INPUT_PORTS_START ( megaplay ) + GENESIS_PORTS + MEGAPLAY_TEST + MEGAPLAY_COIN + MEGAPLAY_DSWA + MEGAPLAY_DSWB + +INPUT_PORTS_END + +static INPUT_PORTS_START ( mp_sonic ) + GENESIS_PORTS + MEGAPLAY_TEST + MEGAPLAY_COIN + MEGAPLAY_DSWA + MEGAPLAY_DSWB + + PORT_START + // DSW C (per game settings) + PORT_DIPNAME( 0x03, 0x01, "Initial Players" ) PORT_DIPLOCATION("SW3:1,2") + PORT_DIPSETTING( 0x00, "4" ) + PORT_DIPSETTING( 0x01, "3" ) + PORT_DIPSETTING( 0x02, "2" ) + PORT_DIPSETTING( 0x03, "1" ) + + PORT_DIPNAME( 0x0c, 0x0c, DEF_STR( Difficulty ) ) PORT_DIPLOCATION("SW3:3,4") + PORT_DIPSETTING( 0x00, DEF_STR( Hardest ) ) + PORT_DIPSETTING( 0x04, DEF_STR( Hard ) ) + PORT_DIPSETTING( 0x08, DEF_STR( Easy ) ) + PORT_DIPSETTING( 0x0c, DEF_STR( Normal ) ) + // Who knows... +// PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_UNKNOWN ) PORT_NAME("0x6201 bit 4") PORT_CODE(KEYCODE_G) +// PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_UNKNOWN ) PORT_NAME("0x6201 bit 5") PORT_CODE(KEYCODE_H) +// PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_UNKNOWN ) PORT_NAME("0x6201 bit 6") PORT_CODE(KEYCODE_J) +// PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_UNKNOWN ) PORT_NAME("0x6201 bit 7") PORT_CODE(KEYCODE_K) + +INPUT_PORTS_END + +static INPUT_PORTS_START ( mp_gaxe2 ) + GENESIS_PORTS + MEGAPLAY_TEST + MEGAPLAY_COIN + MEGAPLAY_DSWA + MEGAPLAY_DSWB + + PORT_START + // DSW C (per game settings) + PORT_DIPNAME( 0x01, 0x01, DEF_STR( Difficulty ) ) PORT_DIPLOCATION("SW3:1") + PORT_DIPSETTING( 0x01, DEF_STR( Normal ) ) + PORT_DIPSETTING( 0x00, DEF_STR( Hard ) ) + + PORT_DIPNAME( 0x02, 0x00, "Life" ) PORT_DIPLOCATION("SW3:2") + PORT_DIPSETTING( 0x02, "1" ) + PORT_DIPSETTING( 0x00, "2" ) + + PORT_DIPNAME( 0x04, 0x04, "Initial Players" ) PORT_DIPLOCATION("SW3:3") + PORT_DIPSETTING( 0x00, "1" ) + PORT_DIPSETTING( 0x04, "2" ) + + PORT_DIPNAME( 0x08, 0x00, "Timer" ) PORT_DIPLOCATION("SW3:4") + PORT_DIPSETTING( 0x08, DEF_STR( Off ) ) + PORT_DIPSETTING( 0x00, DEF_STR( On ) ) + + // Who knows... +// PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_UNKNOWN ) PORT_NAME("0x6201 bit 4") PORT_CODE(KEYCODE_G) +// PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_UNKNOWN ) PORT_NAME("0x6201 bit 5") PORT_CODE(KEYCODE_H) +// PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_UNKNOWN ) PORT_NAME("0x6201 bit 6") PORT_CODE(KEYCODE_J) +// PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_UNKNOWN ) PORT_NAME("0x6201 bit 7") PORT_CODE(KEYCODE_K) + +INPUT_PORTS_END + +static INPUT_PORTS_START ( mp_col3 ) + GENESIS_PORTS + MEGAPLAY_TEST + MEGAPLAY_COIN + MEGAPLAY_DSWA + MEGAPLAY_DSWB + + PORT_START + // DSW C (per game settings) + PORT_DIPNAME( 0x01, 0x01, DEF_STR( Language ) ) PORT_DIPLOCATION("SW3:1") + PORT_DIPSETTING( 0x01, DEF_STR( English ) ) + PORT_DIPSETTING( 0x00, DEF_STR( Japanese ) ) + + PORT_DIPNAME( 0x02, 0x02, "2P Mode Games" ) PORT_DIPLOCATION("SW3:2") + PORT_DIPSETTING( 0x02, "1" ) + PORT_DIPSETTING( 0x00, "3" ) + + PORT_DIPNAME( 0x0c, 0x0c, "Speed / Difficulty" ) PORT_DIPLOCATION("SW3:3,4") + PORT_DIPSETTING( 0x08, "Slow" ) + PORT_DIPSETTING( 0x0c, "Middle" ) + PORT_DIPSETTING( 0x04, "Fast" ) + PORT_DIPSETTING( 0x00, "Max" ) + + // Who knows... +// PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_UNKNOWN ) PORT_NAME("0x6201 bit 4") PORT_CODE(KEYCODE_G) +// PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_UNKNOWN ) PORT_NAME("0x6201 bit 5") PORT_CODE(KEYCODE_H) +// PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_UNKNOWN ) PORT_NAME("0x6201 bit 6") PORT_CODE(KEYCODE_J) +// PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_UNKNOWN ) PORT_NAME("0x6201 bit 7") PORT_CODE(KEYCODE_K) + +INPUT_PORTS_END + +static INPUT_PORTS_START ( mp_twc ) + GENESIS_PORTS + MEGAPLAY_TEST + MEGAPLAY_COIN + MEGAPLAY_DSWA + MEGAPLAY_DSWB + + PORT_START + // DSW C (per game settings) + PORT_DIPNAME( 0x01, 0x01, "Time" ) PORT_DIPLOCATION("SW3:1") + PORT_DIPSETTING( 0x01, DEF_STR( Normal ) ) + PORT_DIPSETTING( 0x00, "Short" ) + + PORT_DIPNAME( 0x0e, 0x08, "Level" ) PORT_DIPLOCATION("SW3:2,3,4") + PORT_DIPSETTING( 0x00, "0" ) + PORT_DIPSETTING( 0x02, "0" ) + PORT_DIPSETTING( 0x04, "5" ) + PORT_DIPSETTING( 0x06, "4" ) + PORT_DIPSETTING( 0x08, "3" ) + PORT_DIPSETTING( 0x0a, "2" ) + PORT_DIPSETTING( 0x0c, "1" ) + PORT_DIPSETTING( 0x0e, "0" ) + +INPUT_PORTS_END + +static INPUT_PORTS_START ( mp_sor2 ) + GENESIS_PORTS + MEGAPLAY_TEST + MEGAPLAY_COIN + MEGAPLAY_DSWA + MEGAPLAY_DSWB + + PORT_START + // DSW C (per game settings) + PORT_DIPNAME( 0x03, 0x01, DEF_STR( Lives ) ) PORT_DIPLOCATION("SW3:1,2") + PORT_DIPSETTING( 0x00, "4" ) + PORT_DIPSETTING( 0x01, "3" ) + PORT_DIPSETTING( 0x02, "2" ) + PORT_DIPSETTING( 0x03, "1" ) + + PORT_DIPNAME( 0xc, 0x0c, DEF_STR ( Difficulty ) ) PORT_DIPLOCATION("SW3:3,4") + PORT_DIPSETTING( 0x00, DEF_STR ( Hardest ) ) + PORT_DIPSETTING( 0x04, DEF_STR ( Hard ) ) + PORT_DIPSETTING( 0x08, DEF_STR ( Easy ) ) + PORT_DIPSETTING( 0x0c, DEF_STR ( Normal ) ) + +INPUT_PORTS_END + +static INPUT_PORTS_START ( mp_bio ) + GENESIS_PORTS + MEGAPLAY_TEST + MEGAPLAY_COIN + MEGAPLAY_DSWA + MEGAPLAY_DSWB + + PORT_START + // DSW C (per game settings) + PORT_DIPNAME( 0x03, 0x03, DEF_STR( Lives ) ) PORT_DIPLOCATION("SW3:1,2") + PORT_DIPSETTING( 0x00, "5" ) + PORT_DIPSETTING( 0x01, "4" ) + PORT_DIPSETTING( 0x02, "2" ) + PORT_DIPSETTING( 0x03, "3" ) + + PORT_DIPNAME( 0xc, 0x0c, DEF_STR ( Difficulty ) ) PORT_DIPLOCATION("SW3:3,4") + PORT_DIPSETTING( 0x00, DEF_STR ( Hardest ) ) + PORT_DIPSETTING( 0x04, DEF_STR ( Hard ) ) + PORT_DIPSETTING( 0x08, DEF_STR ( Easy ) ) + PORT_DIPSETTING( 0x0c, DEF_STR ( Normal ) ) + +INPUT_PORTS_END + +static INPUT_PORTS_START ( mp_gslam ) + GENESIS_PORTS + MEGAPLAY_TEST + MEGAPLAY_COIN + MEGAPLAY_DSWA + MEGAPLAY_DSWB + + PORT_START + // DSW C (per game settings) + PORT_DIPNAME( 0x07, 0x04, DEF_STR ( Game_Time ) ) PORT_DIPLOCATION("SW3:1,2,3") + PORT_DIPSETTING( 0x00, "5:00" ) + PORT_DIPSETTING( 0x01, "4:30" ) + PORT_DIPSETTING( 0x02, "4:00" ) + PORT_DIPSETTING( 0x03, "3:30" ) + PORT_DIPSETTING( 0x04, "3:00" ) + PORT_DIPSETTING( 0x05, "2:30" ) + PORT_DIPSETTING( 0x06, "2:00" ) + PORT_DIPSETTING( 0x07, "1:30" ) + + + PORT_DIPNAME( 0x08, 0x08, "2P-Play Continue" ) PORT_DIPLOCATION("SW3:4") + PORT_DIPSETTING( 0x00, "1 Credit" ) + PORT_DIPSETTING( 0x08, "2 Credits" ) + +INPUT_PORTS_END + +static INPUT_PORTS_START ( mp_mazin ) + GENESIS_PORTS + MEGAPLAY_TEST + MEGAPLAY_COIN + MEGAPLAY_DSWA + MEGAPLAY_DSWB + + PORT_START + // DSW C (per game settings) + PORT_DIPNAME( 0x01, 0x01, "Initial Player" ) PORT_DIPLOCATION("SW3:1") + PORT_DIPSETTING( 0x01, "2" ) + PORT_DIPSETTING( 0x00, "1" ) + + PORT_DIPNAME( 0x02, 0x02, "Initial Player" ) PORT_DIPLOCATION("SW3:2") + PORT_DIPSETTING( 0x02, "1" ) + PORT_DIPSETTING( 0x00, "4" ) + + PORT_DIPNAME( 0x04, 0x04, DEF_STR ( Difficulty ) ) PORT_DIPLOCATION("SW3:3") + PORT_DIPSETTING( 0x04, DEF_STR ( Hard ) ) + PORT_DIPSETTING( 0x00, DEF_STR ( Normal ) ) + + PORT_DIPNAME( 0x08, 0x08, "Title" ) PORT_DIPLOCATION("SW3:4") + PORT_DIPSETTING( 0x08, "EUROPE" ) + PORT_DIPSETTING( 0x00, "U.S.A" ) + +INPUT_PORTS_END + +static INPUT_PORTS_START ( mp_soni2 ) + GENESIS_PORTS + MEGAPLAY_TEST + MEGAPLAY_COIN + MEGAPLAY_DSWA + MEGAPLAY_DSWB + + PORT_START + // DSW C (per game settings) + PORT_DIPNAME( 0x03, 0x01, "Initial Players (Normal mode)" ) PORT_DIPLOCATION("SW3:1,2") + PORT_DIPSETTING( 0x00, "4" ) + PORT_DIPSETTING( 0x01, "3" ) + PORT_DIPSETTING( 0x02, "2" ) + PORT_DIPSETTING( 0x03, "1" ) + + PORT_DIPNAME( 0x0c, 0x0c, "Initial Players (Dual mode)" ) PORT_DIPLOCATION("SW3:3,4") + PORT_DIPSETTING( 0x00, "4" ) + PORT_DIPSETTING( 0x04, "2" ) + PORT_DIPSETTING( 0x08, "1" ) + PORT_DIPSETTING( 0x0c, "3" ) + +INPUT_PORTS_END + +/*MEGAPLAY specific*/ + +static READ8_HANDLER( megaplay_bios_banksel_r ) +{ + return bios_bank; +} + +static WRITE8_HANDLER( megaplay_bios_banksel_w ) +{ +/* Multi-slot note: + Bits 0 and 1 appear to determine the selected game slot. + It should be possible to multiplex different game ROMs at + 0x000000-0x3fffff based on these bits. +*/ + bios_bank = data; + bios_mode = MP_ROM; +// logerror("BIOS: ROM bank %i selected [0x%02x]\n",bios_bank >> 6, data); +} + +static READ8_HANDLER( megaplay_bios_gamesel_r ) +{ + return bios_6403; +} + +static WRITE8_HANDLER( megaplay_bios_gamesel_w ) +{ + bios_6403 = data; + +// logerror("BIOS: 0x6403 write: 0x%02x\n",data); + bios_mode = data & 0x10; +} + + +static READ8_HANDLER( bank_r ) +{ + UINT8* bank = memory_region(REGION_CPU3); + UINT8* game = memory_region(REGION_CPU1); + + if(game_banksel == 0x142) // Genesis I/O + return megaplay_genesis_io_r((offset/2) & 0x1f, 0xffff); + + if(bios_mode & MP_ROM) + { + int sel = (bios_bank >> 6) & 0x03; + +// popmessage("Reading from Bank %i",sel); + + if(sel == 0) + return 0xff; + else + return bank[0x10000 + (sel-1)*0x8000 + offset]; + } + else + { + if(game_banksel == 0x60 || game_banksel == 0x61) /* read game info ROM */ + if(bios_width & 0x08) + { + if(offset >= 0x2000) + return ic36_ram[offset - 0x2000]; + else + return ic37_ram[(0x2000 * (bios_bank & 0x03)) + offset]; + } + else + return game[((game_banksel)*0x8000 + offset)]; + else + return game[(game_banksel*0x8000 + (offset ^ 0x01))]; + } +} + +static WRITE8_HANDLER ( bank_w ) +{ + if(game_banksel == 0x142) // Genesis I/O + genesis_io_w((offset/2) & 0x1f, data, 0xffff); + + if(offset <= 0x1fff && (bios_width & 0x08)) + ic37_ram[(0x2000 * (bios_bank & 0x03)) + offset] = data; + + if(offset >= 0x2000 && (bios_width & 0x08)) +// ic36_ram[offset] = data; + ic36_ram[offset - 0x2000] = data; +} + + +static READ8_HANDLER( megaplay_bios_6402_r ) +{ + return genesis_io_ram[3];// & 0xfe; +// return bios_6402;// & 0xfe; +} + +static WRITE8_HANDLER( megaplay_bios_6402_w ) +{ + genesis_io_ram[3] = (genesis_io_ram[3] & 0x07) | ((data & 0x70) >> 1); +// bios_6402 = (data >> 4) & 0x07; +// logerror("BIOS: 0x6402 write: 0x%02x\n",data); +} + +static READ8_HANDLER( megaplay_bios_6404_r ) +{ +// logerror("BIOS: 0x6404 read: returned 0x%02x\n",bios_6404 | (bios_6403 & 0x10) >> 4); + return (bios_6404 & 0xfe) | ((bios_6403 & 0x10) >> 4); +// return bios_6404 | (bios_6403 & 0x10) >> 4; +} + +static WRITE8_HANDLER( megaplay_bios_6404_w ) +{ + if(((bios_6404 & 0x0c) == 0x00) && ((data & 0x0c) == 0x0c)) + cpunum_set_input_line(0, INPUT_LINE_RESET, PULSE_LINE); + bios_6404 = data; + +// logerror("BIOS: 0x6404 write: 0x%02x\n",data); +} + +static READ8_HANDLER( megaplay_bios_6204_r ) +{ + return (genesis_io_ram[3]); +// return (bios_width & 0xf8) + (bios_6204 & 0x07); +} + +static WRITE8_HANDLER( megaplay_bios_width_w ) +{ + bios_width = data; + genesis_io_ram[3] = (genesis_io_ram[3] & 0x07) | ((data & 0xf8)); + +// logerror("BIOS: 0x6204 - Width write: %02x\n",data); +} + +static READ8_HANDLER( megaplay_bios_6600_r ) +{ +/* Multi-slot note: + 0x6600 appears to be used to check for extra slots being used. + Enter the following line in place of the return statement in this + function to make the BIOS check all 4 slots (3 and 4 will be "not used") + return (bios_6600 & 0xfe) | (bios_bank & 0x01); +*/ + return bios_6600;// & 0xfe; +} + +static WRITE8_HANDLER( megaplay_bios_6600_w ) +{ + bios_6600 = data; +// logerror("BIOS: 0x6600 write: 0x%02x\n",data); +} + +static WRITE8_HANDLER( megaplay_game_w ) +{ + if(readpos == 1) + game_banksel = 0; + game_banksel |= (1 << (readpos-1)) * (data & 0x01); + + readpos++; + if(readpos > 9) + { + bios_mode = MP_GAME; + readpos = 1; +// popmessage("Game bank selected: 0x%03x",game_banksel); + logerror("BIOS [0x%04x]: 68K address space bank selected: 0x%03x\n",activecpu_get_previouspc(),game_banksel); + } +} + +static ADDRESS_MAP_START( megaplay_bios_readmem, ADDRESS_SPACE_PROGRAM, 8 ) + AM_RANGE(0x0000, 0x3fff) AM_READ(MRA8_ROM) + AM_RANGE(0x4000, 0x4fff) AM_READ(MRA8_RAM) + AM_RANGE(0x5000, 0x5fff) AM_READ(MRA8_RAM) + AM_RANGE(0x6200, 0x6200) AM_READ(input_port_7_r) + AM_RANGE(0x6201, 0x6201) AM_READ(input_port_8_r) + AM_RANGE(0x6400, 0x6400) AM_READ(input_port_5_r) + AM_RANGE(0x6401, 0x6401) AM_READ(input_port_6_r) + AM_RANGE(0x6204, 0x6204) AM_READ(megaplay_bios_6204_r) + AM_RANGE(0x6203, 0x6203) AM_READ(megaplay_bios_banksel_r) + AM_RANGE(0x6402, 0x6402) AM_READ(megaplay_bios_6402_r) + AM_RANGE(0x6403, 0x6403) AM_READ(megaplay_bios_gamesel_r) + AM_RANGE(0x6404, 0x6404) AM_READ(megaplay_bios_6404_r) + AM_RANGE(0x6600, 0x6600) AM_READ(megaplay_bios_6600_r) + AM_RANGE(0x6800, 0x77ff) AM_READ(MRA8_RAM) + AM_RANGE(0x8000, 0xffff) AM_READ(bank_r) +ADDRESS_MAP_END + +static ADDRESS_MAP_START( megaplay_bios_writemem, ADDRESS_SPACE_PROGRAM, 8 ) + AM_RANGE(0x0000, 0x3fff) AM_WRITE(MWA8_ROM) + AM_RANGE(0x4000, 0x4fff) AM_WRITE(MWA8_RAM) + AM_RANGE(0x5000, 0x5fff) AM_WRITE(MWA8_RAM) + AM_RANGE(0x6000, 0x6000) AM_WRITE(megaplay_game_w) + AM_RANGE(0x6203, 0x6203) AM_WRITE(megaplay_bios_banksel_w) + AM_RANGE(0x6204, 0x6204) AM_WRITE(megaplay_bios_width_w) + AM_RANGE(0x6402, 0x6402) AM_WRITE(megaplay_bios_6402_w) + AM_RANGE(0x6403, 0x6403) AM_WRITE(megaplay_bios_gamesel_w) + AM_RANGE(0x6404, 0x6404) AM_WRITE(megaplay_bios_6404_w) + AM_RANGE(0x6600, 0x6600) AM_WRITE(megaplay_bios_6600_w) + AM_RANGE(0x6001, 0x67ff) AM_WRITE(MWA8_RAM) + AM_RANGE(0x6800, 0x77ff) AM_WRITE(MWA8_RAM) AM_BASE(&ic3_ram) + AM_RANGE(0x8000, 0xffff) AM_WRITE(bank_w) +ADDRESS_MAP_END + +/* basically from src/drivers/segasyse.c */ +UINT8 segae_vdp_ctrl_r ( UINT8 chip ); +UINT8 segae_vdp_data_r ( UINT8 chip ); +void segae_vdp_ctrl_w ( UINT8 chip, UINT8 data ); +void segae_vdp_data_w ( UINT8 chip, UINT8 data ); + +static READ8_HANDLER (megaplay_bios_port_be_bf_r) +{ + UINT8 temp = 0; + + switch (offset) + { + case 0: /* port 0xbe, VDP 1 DATA Read */ + temp = segae_vdp_data_r(0); break ; + case 1: /* port 0xbf, VDP 1 CTRL Read */ + temp = segae_vdp_ctrl_r(0); break ; + } + return temp; +} + +static WRITE8_HANDLER (megaplay_bios_port_be_bf_w) +{ + switch (offset) + { + case 0: /* port 0xbe, VDP 1 DATA Write */ + segae_vdp_data_w(0, data); break; + case 1: /* port 0xbf, VDP 1 CTRL Write */ + segae_vdp_ctrl_w(0, data); break; + } +} + +static ADDRESS_MAP_START( megaplay_bios_readport, ADDRESS_SPACE_IO, 8 ) + ADDRESS_MAP_FLAGS( AMEF_ABITS(8) ) +// AM_RANGE(0xdc, 0xdc) AM_READ(megatech_bios_port_dc_r) // player inputs +// AM_RANGE(0xdd, 0xdd) AM_READ(megatech_bios_port_dd_r) // other player 2 inputs + AM_RANGE(0xbe, 0xbf) AM_READ(megaplay_bios_port_be_bf_r) /* VDP */ +ADDRESS_MAP_END + +static ADDRESS_MAP_START( megaplay_bios_writeport, ADDRESS_SPACE_IO, 8 ) + ADDRESS_MAP_FLAGS( AMEF_ABITS(8) ) +// AM_RANGE(0x3f, 0x3f) AM_WRITE(megatech_bios_port_ctrl_w) + AM_RANGE(0x7f, 0x7f) AM_WRITE(SN76496_1_w) /* SN76489 */ + AM_RANGE(0xbe, 0xbf) AM_WRITE(megaplay_bios_port_be_bf_w) /* VDP */ +ADDRESS_MAP_END + + +/* in video/segasyse.c */ +void megaplay_start_video_normal(running_machine *machine); +void megaplay_update_video_normal(running_machine *machine, mame_bitmap *bitmap, const rectangle *cliprect ); + +/* give us access to the megadriv start and update functions so that we can call them */ +extern UINT32 video_update_megadriv(running_machine *machine, int screen, mame_bitmap *bitmap, const rectangle *cliprect); +extern void video_start_megadriv(running_machine *machine); + +static VIDEO_START(megplay) +{ + //printf("megplay vs\n"); + video_start_megadriv(Machine); + megaplay_start_video_normal(Machine); +} + +static VIDEO_UPDATE(megplay) +{ + //printf("megplay vu\n"); + video_update_megadriv(machine,0,bitmap,cliprect); + megaplay_update_video_normal(machine, bitmap,cliprect); + return 0; +} + + +//extern VIDEO_EOF(megadriv); + +static MACHINE_DRIVER_START( mpnew ) + + /* basic machine hardware */ + MDRV_IMPORT_FROM(megadriv) + + /* The Megaplay has an extra BIOS cpu which drives an SMS VDP + which includes an SN76496 for sound */ + MDRV_CPU_ADD_TAG("megaplay_bios", Z80, MASTER_CLOCK / 15) /* ?? */ + MDRV_CPU_PROGRAM_MAP(megaplay_bios_readmem, megaplay_bios_writemem) + MDRV_CPU_IO_MAP(megaplay_bios_readport,megaplay_bios_writeport) + MDRV_CPU_VBLANK_INT(megaplay_bios_irq, 262) + + MDRV_INTERLEAVE(100) + + MDRV_SOUND_ADD(SN76496, MASTER_CLOCK/15) + MDRV_SOUND_ROUTE(ALL_OUTPUTS, "left", 0.25) /* 3.58 MHz */ + MDRV_SOUND_ROUTE(ALL_OUTPUTS, "right",0.25) /* 3.58 MHz */ + + /* New update functions to handle the extra layer */ + MDRV_VIDEO_START(megplay) + MDRV_VIDEO_UPDATE(megplay) +MACHINE_DRIVER_END + + +/* MegaPlay Games - Modified Genesis games */ + +#define ROM_LOAD_BIOS(bios,name,offset,length,hash) \ + ROMX_LOAD(name, offset, length, hash, ROM_BIOS(bios+1)) /* Note '+1' */ + +#define MEGAPLAY_BIOS \ + ROM_SYSTEM_BIOS( 0, "ver1", "Megaplay Bios (Ver. 1)" ) \ + ROM_LOAD_BIOS( 0, "ep15294.ic2", 0x000000, 0x20000, CRC(aa8dc2d8) SHA1(96771ad7b79dc9c83a1594243250d65052d23176) ) \ + ROM_SYSTEM_BIOS( 1, "ver2", "Megaplay Bios (Ver. 2)" ) /* this one doesn't boot .. dump was verified with another working pcb */ \ + ROM_LOAD_BIOS( 1, "epr-a15294.ic2",0x000000, 0x20000, CRC(f97c68aa) SHA1(bcabc879950bca1ced11c550a484e697ec5706b2) ) \ + +ROM_START( megaplay ) + ROM_REGION( 0x400000, REGION_CPU1, ROMREGION_ERASEFF ) + + ROM_REGION( 0x8000, REGION_USER1, ROMREGION_ERASEFF ) + + ROM_REGION( 0x28000, REGION_CPU3, 0 ) /* Bios */ + MEGAPLAY_BIOS +ROM_END + +ROM_START( mp_sonic ) /* Sonic */ + ROM_REGION( 0x400000, REGION_CPU1, 0 ) + ROM_LOAD16_BYTE( "ep15177.ic2", 0x000000, 0x040000, CRC(a389b03b) SHA1(8e9e1cf3dd65ddf08757f5a1ce472130c902ea2c) ) + ROM_LOAD16_BYTE( "ep15176.ic1", 0x000001, 0x040000, CRC(d180cc21) SHA1(62805cfaaa80c1da6146dd89fc2b49d819fd4f22) ) + /* Game Instruction rom copied to 0x300000 - 0x310000 (odd / even bytes equal) */ + + ROM_REGION( 0x8000, REGION_USER1, 0 ) /* Game Instructions */ + ROM_LOAD( "ep15175-01.ic3", 0x000000, 0x08000, CRC(99246889) SHA1(184aa3b7fdedcf578c5e34edb7ed44f57f832258) ) + + ROM_REGION( 0x28000, REGION_CPU3, 0 ) /* Bios */ + MEGAPLAY_BIOS +ROM_END + +/* this cart looks to be a conversion from something else.. sega rom numbers were missing + but the code looks like it's probably real */ +/* pcb 171-5834 */ +ROM_START( mp_col3 ) /* Columns 3 */ + ROM_REGION( 0x400000, REGION_CPU1, 0 ) + ROM_LOAD16_BYTE( "3.ic2", 0x000000, 0x040000, CRC(a1602235) SHA1(38751b585849c8966acc3f508714937fe29dcf5c) ) + ROM_LOAD16_BYTE( "2.ic1", 0x000001, 0x040000, CRC(999b2fe6) SHA1(ad967a28e4eebd7b01273e4e04c35a0198ef834a) ) + /* Game Instruction rom copied to 0x300000 - 0x310000 (odd / even bytes equal) */ + + ROM_REGION( 0x8000, REGION_USER1, 0 ) /* Game Instructions */ + ROM_LOAD( "1.ic3", 0x000000, 0x08000, CRC(dac9bf91) SHA1(0117972a7181f8aaf942a259cc8764b821031253) ) + + ROM_REGION( 0x28000, REGION_CPU3, 0 ) /* Bios */ + MEGAPLAY_BIOS +ROM_END + +ROM_START( mp_gaxe2 ) /* Golden Axe 2 */ + ROM_REGION( 0x400000, REGION_CPU1, 0 ) + ROM_LOAD16_BYTE( "ep15179b.ic2", 0x000000, 0x040000, CRC(00d97b84) SHA1(914bbf566ddf940aab67b92af237d251650ddadf) ) + ROM_LOAD16_BYTE( "ep15178b.ic1", 0x000001, 0x040000, CRC(2ea576db) SHA1(6d96b948243533de1f488b1f80e0d5431a4f1f53) ) + /* Game Instruction rom copied to 0x300000 - 0x310000 (odd / even bytes equal) */ + + ROM_REGION( 0x8000, REGION_USER1, 0 ) /* Game Instructions */ + ROM_LOAD( "ep15175-02b.ic3", 0x000000, 0x08000, CRC(3039b653) SHA1(b19874c74d0fc0cca1169f62e5e74f0e8ca83679) ) // 15175-02b.ic3 + + ROM_REGION( 0x28000, REGION_CPU3, 0 ) /* Bios */ + MEGAPLAY_BIOS +ROM_END + +ROM_START( mp_gslam ) /* Grand Slam */ + ROM_REGION( 0x400000, REGION_CPU1, 0 ) + ROM_LOAD16_BYTE( "epr-15181.ic2", 0x000000, 0x040000, CRC(642437c1) SHA1(cbf88e196c04b6d886bf9642b69bf165045510fe) ) + ROM_LOAD16_BYTE( "epr-15180.ic1", 0x000001, 0x040000, CRC(73bb48f1) SHA1(981b64f834d5618599352f5fad683bf232390ba3) ) + /* Game Instruction rom copied to 0x300000 - 0x310000 (odd / even bytes equal) */ + + ROM_REGION( 0x8000, REGION_USER1, 0 ) /* Game Instructions */ + ROM_LOAD( "epr-15175-03.ic3", 0x000000, 0x08000, CRC(70ea1aec) SHA1(0d9d82a1f8aa51d02707f7b343e7cfb6591efccd) ) // 15175-02b.ic3 + + ROM_REGION( 0x28000, REGION_CPU3, 0 ) /* Bios */ + MEGAPLAY_BIOS +ROM_END + + +ROM_START( mp_twc ) /* Tecmo World Cup */ + ROM_REGION( 0x400000, REGION_CPU1, 0 ) + ROM_LOAD16_BYTE( "ep15183.ic2", 0x000000, 0x040000, CRC(8b79b861) SHA1(c72af72840513b82f2562409eccdf13b031bf3c0) ) + ROM_LOAD16_BYTE( "ep15182.ic1", 0x000001, 0x040000, CRC(eb8325c3) SHA1(bb21ac926c353e14184dd476222bc6a8714606e5) ) + /* Game Instruction rom copied to 0x300000 - 0x310000 (odd / even bytes equal) */ + + ROM_REGION( 0x8000, REGION_USER1, 0 ) /* Game Instructions */ + ROM_LOAD( "ep15175-04.ic3", 0x000000, 0x08000, CRC(faf7c030) SHA1(16ef405335b4d3ecb0b7d97b088dafc4278d4726) ) + + ROM_REGION( 0x28000, REGION_CPU3, 0 ) /* Bios */ + MEGAPLAY_BIOS +ROM_END + +ROM_START( mp_sor2 ) /* Streets of Rage 2 */ + ROM_REGION( 0x400000, REGION_CPU1, 0 ) + ROM_LOAD16_WORD_SWAP( "mpr-15425.ic1", 0x000000, 0x200000, CRC(cd6376af) SHA1(57ec210975e40505649f152b60ef54f99da31f0e) ) + /* Game Instruction rom copied to 0x300000 - 0x310000 (odd / even bytes equal) */ + + ROM_REGION( 0x8000, REGION_USER1, 0 ) /* Game Instructions */ + ROM_LOAD( "epr-15175-05.ic2", 0x000000, 0x08000, CRC(1df5347c) SHA1(faced2e875e1914392f61577b5256d006eebeef9) ) + + ROM_REGION( 0x28000, REGION_CPU3, 0 ) /* Bios */ + MEGAPLAY_BIOS +ROM_END + +ROM_START( mp_bio ) /* Bio Hazard Battle */ + ROM_REGION( 0x400000, REGION_CPU1, 0 ) + ROM_LOAD16_WORD_SWAP( "mpr-15699-f.ic1", 0x000000, 0x100000, CRC(4b193229) SHA1(f8629171ae9b4792f142f6957547d886e5cc6817) ) + /* Game Instruction rom copied to 0x300000 - 0x310000 (odd / even bytes equal) */ + + ROM_REGION( 0x8000, REGION_USER1, 0 ) /* Game Instructions */ + ROM_LOAD( "epr-15175-06.ic2", 0x000000, 0x08000, CRC(1ef64e41) SHA1(13984b714b014ea41963b70de74a5358ed223bc5) ) + + ROM_REGION( 0x28000, REGION_CPU3, 0 ) /* Bios */ + MEGAPLAY_BIOS +ROM_END + +ROM_START( mp_soni2 ) /* Sonic The Hedgehog 2 */ + ROM_REGION( 0x400000, REGION_CPU1, 0 ) + ROM_LOAD16_WORD_SWAP( "mpr-16011.ic1", 0x000000, 0x100000, CRC(3d7bf98a) SHA1(dce0e4e8f2573e0ffe851edaa235e4ed9e61ee2d) ) + /* Game Instruction rom copied to 0x300000 - 0x310000 (odd / even bytes equal) */ + + ROM_REGION( 0x8000, REGION_USER1, 0 ) /* Game Instructions */ + ROM_LOAD( "epr-15175-07.ic1", 0x000000, 0x08000, CRC(bb5f67f0) SHA1(33b7a5d14015a5fcf41976a8f648f8f48ce9bb03) ) + + ROM_REGION( 0x28000, REGION_CPU3, 0 ) /* Bios */ + MEGAPLAY_BIOS +ROM_END + +ROM_START( mp_mazin ) /* Mazin Wars */ + ROM_REGION( 0x400000, REGION_CPU1, 0 ) + ROM_LOAD16_WORD_SWAP( "mpr-16460.ic1", 0x000000, 0x100000, CRC(e9635a83) SHA1(ab3afa11656f0ae3a50c957dce012fb15d3992e0) ) + /* Game Instruction rom copied to 0x300000 - 0x310000 (odd / even bytes equal) */ + + ROM_REGION( 0x8000, REGION_USER1, 0 ) /* Game Instructions */ + ROM_LOAD( "epr-15175-11.ic2", 0x000000, 0x08000, CRC(bb651120) SHA1(81cb736f2732373e260dde162249c1d29a3489c3) ) + + ROM_REGION( 0x28000, REGION_CPU3, 0 ) /* Bios */ + MEGAPLAY_BIOS +ROM_END + + +static void megplay_stat(void) +{ + UINT8 *src = memory_region(REGION_CPU3); + UINT8 *instruction_rom = memory_region(REGION_USER1); + UINT8 *game_rom = memory_region(REGION_CPU1); + int offs; + + + memmove(src+0x10000,src+0x8000,0x18000); // move bios.. + + /* copy game instruction rom to main map.. maybe this should just be accessed + through a handler instead?.. */ + for (offs=0;offs<0x8000;offs++) + { + UINT8 dat; + + dat=instruction_rom[offs]; + + game_rom[0x300000+offs*2] = dat; + game_rom[0x300001+offs*2] = dat; + + } +} + +/* Old code, todo, update the new code instead */ +static READ16_HANDLER ( OLD_megaplay_genesis_io_r ) +{ + /* 8-bit only, data is mirrored in both halves */ + + UINT8 return_value = 0; + + switch (offset) + { + case 0: + /* Charles MacDonald ( http://cgfm2.emuviews.com/ ) + D7 : Console is 1= Export (USA, Europe, etc.) 0= Domestic (Japan) + D6 : Video type is 1= PAL, 0= NTSC + D5 : Sega CD unit is 1= not present, 0= connected. + D4 : Unused (always returns zero) + D3 : Bit 3 of version number + D2 : Bit 2 of version number + D1 : Bit 1 of version number + D0 : Bit 0 of version number + */ + return_value = 0x80; /* ? megatech is usa? */ + break; + + case 1: /* port A data (joypad 1) */ + + if (genesis_io_ram[offset] & 0x40) + return_value = readinputport(1) & (genesis_io_ram[4]^0xff); + else + { + return_value = readinputport(2) & (genesis_io_ram[4]^0xff); + return_value |= readinputport(1) & 0x03; + } + return_value = (genesis_io_ram[offset] & 0x80) | return_value; +// logerror ("reading joypad 1 , type %02x %02x\n",genesis_io_ram[offset] & 0xb0, return_value &0x7f); + break; + + case 2: /* port B data (joypad 2) */ + + if (genesis_io_ram[offset] & 0x40) + return_value = readinputport(3) & (genesis_io_ram[5]^0xff); + else + { + return_value = readinputport(4) & (genesis_io_ram[5]^0xff); + return_value |= readinputport(3) & 0x03; + } + return_value = (genesis_io_ram[offset] & 0x80) | return_value; +// logerror ("reading joypad 2 , type %02x %02x\n",genesis_io_ram[offset] & 0xb0, return_value &0x7f); + break; + +// case 3: /* port C data */ +// return_value = bios_6402 << 3; +// break; + + default: + return_value = genesis_io_ram[offset]; + + } + return return_value | return_value << 8; +} + +static WRITE16_HANDLER ( OLD_megaplay_genesis_io_w ) +{ +// logerror ("write io offset :%02x data %04x PC: 0x%06x\n",offset,data,activecpu_get_previouspc()); + + switch (offset) + { + case 0x00: + /*??*/ + break; + + case 0x01:/* port A data */ + genesis_io_ram[offset] = (data & (genesis_io_ram[0x04])) | (genesis_io_ram[offset] & ~(genesis_io_ram[0x04])); + break; + + case 0x02: /* port B data */ + genesis_io_ram[offset] = (data & (genesis_io_ram[0x05])) | (genesis_io_ram[offset] & ~(genesis_io_ram[0x05])); + break; + + case 0x03: /* port C data */ + genesis_io_ram[offset] = (data & (genesis_io_ram[0x06])) | (genesis_io_ram[offset] & ~(genesis_io_ram[0x06])); + bios_6204 = data & 0x07; + break; + + case 0x04: /* port A control */ + genesis_io_ram[offset] = data; + break; + + case 0x05: /* port B control */ + genesis_io_ram[offset] = data; + break; + + case 0x06: /* port C control */ + genesis_io_ram[offset] = data; + break; + + case 0x07: /* port A TxData */ + genesis_io_ram[offset] = data; + break; + + default: + genesis_io_ram[offset] = data; + } +} + + +static READ16_HANDLER( megadriv_68k_read_z80_extra_ram ) +{ + return ic36_ram[(offset<<1)^1] | (ic36_ram[(offset<<1)]<<8); +} + +static WRITE16_HANDLER( megadriv_68k_write_z80_extra_ram ) +{ + if (!ACCESSING_LSB) // byte (MSB) access + { + ic36_ram[(offset<<1)] = (data & 0xff00) >> 8; + } + else if (!ACCESSING_MSB) + { + ic36_ram[(offset<<1)^1] = (data & 0x00ff); + } + else // for WORD access only the MSB is used, LSB is ignored + { + ic36_ram[(offset<<1)] = (data & 0xff00) >> 8; + } +} + + +static DRIVER_INIT (megaplay) +{ + /* to support the old code.. */ + ic36_ram = auto_malloc(0x10000); + ic37_ram = auto_malloc(0x10000); + genesis_io_ram = auto_malloc(0x20); + + driver_init_megadrij(machine); + megplay_stat(); + + /* for now ... */ + memory_install_read16_handler(0, ADDRESS_SPACE_PROGRAM, 0xa10000, 0xa1001f, 0, 0, OLD_megaplay_genesis_io_r); + memory_install_write16_handler(0, ADDRESS_SPACE_PROGRAM, 0xa10000, 0xa1001f, 0, 0, OLD_megaplay_genesis_io_w); + + /* megaplay has ram shared with the bios cpu here */ + memory_install_read8_handler(1, ADDRESS_SPACE_PROGRAM, 0x2000, 0x3fff, 0, 0, MRA8_BANK7); + memory_install_write8_handler(1, ADDRESS_SPACE_PROGRAM, 0x2000, 0x3fff, 0, 0, MWA8_BANK7); + memory_set_bankptr(7, &ic36_ram[0]); + + /* instead of a RAM mirror the 68k sees the extra ram of the 2nd z80 too */ + memory_install_read16_handler(0, ADDRESS_SPACE_PROGRAM, 0xa02000, 0xa03fff, 0, 0, megadriv_68k_read_z80_extra_ram); + memory_install_write16_handler(0, ADDRESS_SPACE_PROGRAM, 0xa02000, 0xa03fff, 0, 0, megadriv_68k_write_z80_extra_ram); +} + +/* +Sega Mega Play Cartridges +------------------------- + +These are cart-based games for use with Sega Mega Play hardware. There are 2 known types of carts. Both carts +are very simple, almost exactly the same as Mega Tech carts. They contain just 2 or 3 ROMs. +PCB 171-6215A has locations for 2 ROMs and is dated 1991. +PCB 171-5834 has locations for 3 ROMs and is dated 1989. + + |------------------------------- ROMs ------------------------------| + | | +Game PCB # Sticker on PCB Sticker on cart IC1 IC2 IC3 +------------------------------------------------------------------------------------------------------------------------------------------- +Sonic The Hedgehog - -01 +Golden Axe 2 - -02 +Grand Slam 171-5834 837-9165-03 610-0297-03 EPR-15180 (27C020) EPR-15181 (27C020) EPR-15175-03 (27256) +Tecmo World Cup - -04 +Columns 3 171-5834 610-0297-04* 2 (27C020) 3 (27C020) 1 (27256) +Streets Of Rage II 171-6215A 837-9165-05 610-0297-05 MPR-15425 (8316200A) EPR-15175-05 (27256) n/a +Bio-Hazard Battle 171-6215A 837-9165-06 610-0298-06 MPR-15699-F (838200) EPR-15175-06 (27256) n/a +Sonic The Hedgehog 2 171-6215A 837-9165-07 610-0297-07 MPR-16011 (838200) EPR-15175-07 (27256) n/a +Mazin Wars 171-6215A 837-9165-11 610-0297-11 MPR-16460 (838200) EPR-15175-11 (27256) n/a + +* This is the code for Tecmo World Cup, as the ROMs in the Columns 3 cart +didn't have original Sega part numbers it's probably a converted TWC cart + +*/ + +/* -- */ GAME( 1993, megaplay, 0, mpnew, megaplay, megaplay, ROT0, "Sega", "Mega Play BIOS", GAME_IS_BIOS_ROOT ) +/* 01 */ GAME( 1993, mp_sonic, megaplay, mpnew, mp_sonic, megaplay, ROT0, "Sega", "Sonic The Hedgehog (Mega Play)" , 0 ) +/* 02 */ GAME( 1993, mp_gaxe2, megaplay, mpnew, mp_gaxe2, megaplay, ROT0, "Sega", "Golden Axe II (Mega Play)" , 0 ) +/* 03 */ GAME( 1993, mp_gslam, megaplay, mpnew, mp_gslam, megaplay, ROT0, "Sega", "Grand Slam (Mega Play)",0 ) +/* 04 */ GAME( 1993, mp_twc, megaplay, mpnew, mp_twc, megaplay, ROT0, "Sega", "Tecmo World Cup (Mega Play)" , 0 ) +/* 05 */ GAME( 1993, mp_sor2, megaplay, mpnew, mp_sor2, megaplay, ROT0, "Sega", "Streets of Rage II (Mega Play)" , 0 ) +/* 06 */ GAME( 1993, mp_bio, megaplay, mpnew, mp_bio, megaplay, ROT0, "Sega", "Bio-hazard Battle (Mega Play)" , 0 ) +/* 07 */ GAME( 1993, mp_soni2, megaplay, mpnew, mp_soni2, megaplay, ROT0, "Sega", "Sonic The Hedgehog 2 (Mega Play)" , 0 ) +/* 08 */ +/* 09 */ +/* 10 */ +/* 11 */ GAME( 1993, mp_mazin, megaplay, mpnew, mp_mazin, megaplay, ROT0, "Sega", "Mazin Wars / Mazin Saga (Mega Play)",0 ) + +/* ?? */ GAME( 1993, mp_col3, megaplay, mpnew, megaplay, megaplay, ROT0, "Sega", "Columns III (Mega Play)" , 0 ) + + +/* Also known to exist: +Gunstar Heroes ++ at least 2 others? + +*/ |