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some reorganization in megadriv.c, porting over some code to attempt to get it working again, bit by bit.

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This commit is contained in:
davidhay 2008-10-22 16:20:45 +00:00
parent add038ed62
commit f0d27435f7
1 changed files with 184 additions and 130 deletions
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314
src/mame/drivers/megadriv.c
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@ -65,12 +65,16 @@ On SegaC2 the VDP never turns on the IRQ6 enable register
#include "sound/fm.h"
#include "cpu/m68000/m68000.h"
#include "megadriv.h"
#include "cpu/sh2/sh2.h"
#define MEGADRIV_VDP_VRAM(address) megadrive_vdp_vram[(address)&0x7fff]
/* the same on all systems? */
#define MASTER_CLOCK_NTSC 53693100
#define MASTER_CLOCK_NTSC 53693175
#define MASTER_CLOCK_PAL 53203424
#define SEGACD_CLOCK 12500000
/* timing details */
static int megadriv_framerate;
static int megadrive_total_scanlines;
@ -85,12 +89,20 @@ static int megadrive_vblank_flag = 0;
static int megadrive_irq6_pending = 0;
static int megadrive_irq4_pending = 0;
/* 32x! */
static int _32x_master_cpu_number;
static int _32x_slave_cpu_number;
/* SegaCD! */
static int _segacd_68k_cpu_number;
static int _genesis_snd_z80_cpu_number;
int segac2_bg_pal_lookup[4] = { 0x00, 0x10, 0x20, 0x30 };
int segac2_sp_pal_lookup[4] = { 0x00, 0x10, 0x20, 0x30 };
// hacks for C2
int genvdp_use_cram = 1; // c2 uses it's own palette ram
int genesis_has_z80 = 1; // c2 doesn't have a z80..
int genesis_has_z80;
int genesis_always_irq6 = 0; // c2 never enables the irq6, different source??
int genesis_other_hacks = 1; // misc hacks
@ -2484,98 +2496,17 @@ ADDRESS_MAP_END
/****************************************** 32X related ******************************************/
static READ16_HANDLER( _32x_reg_r )
{
return mame_rand(machine);
}
static UINT16 _32x_68k_comms[0x8];
static UINT16 _32x_palette[0x400/2];
static READ16_HANDLER( _32x_68k_comms_r )
{
return _32x_68k_comms[offset];
}
static WRITE16_HANDLER(_32x_68k_comms_w)
{
_32x_68k_comms[offset] = data;
}
static READ16_HANDLER( _32x_68k_palette_r )
{
return _32x_palette[offset];
}
static WRITE16_HANDLER( _32x_68k_palette_w )
{
_32x_palette[offset] = data;
}
static ADDRESS_MAP_START( _32x_readmem, ADDRESS_SPACE_PROGRAM, 16 )
AM_RANGE(0x000000 , 0x3fffff) AM_READ(SMH_ROM)
AM_RANGE(0x880000 , 0x8fffff) AM_READ(SMH_BANK2)
AM_RANGE(0x900000 , 0x9fffff) AM_READ(SMH_BANK3)
AM_RANGE(0xa00000 , 0xa01fff) AM_READ(megadriv_68k_read_z80_ram)
AM_RANGE(0xa04000 , 0xa04003) AM_READ(megadriv_68k_YM2612_read)
AM_RANGE(0xa10000 , 0xa1001f) AM_READ(megadriv_68k_io_read)
AM_RANGE(0xa11100 , 0xa11101) AM_READ(megadriv_68k_check_z80_bus)
AM_RANGE(0xa15120 , 0xa1512f) AM_READ(_32x_68k_comms_r )
AM_RANGE(0xa1518a , 0xa1518b) AM_READ(_32x_reg_r)
AM_RANGE(0xa15200 , 0xa153ff) AM_READ(_32x_68k_palette_r )
AM_RANGE(0xc00000 , 0xc0001f) AM_READ(megadriv_vdp_r)
AM_RANGE(0xd00000 , 0xd0001f) AM_READ(megadriv_vdp_r) // the earth defend
AM_RANGE(0xe00000 , 0xe0ffff) AM_READ(SMH_RAM) AM_MIRROR(0x1f0000)
static ADDRESS_MAP_START( sh2_main_map, ADDRESS_SPACE_PROGRAM, 32 )
AM_RANGE(0x0000000 , 0x0003fff) AM_ROM
ADDRESS_MAP_END
static ADDRESS_MAP_START( _32x_writemem, ADDRESS_SPACE_PROGRAM, 16 )
AM_RANGE(0x000000 , 0x3fffff) AM_WRITE(SMH_ROM)
AM_RANGE(0x880000, 0x8fffff) AM_WRITE(SMH_ROM)
AM_RANGE(0x900000, 0x9fffff) AM_WRITE(SMH_ROM)
AM_RANGE(0xa00000 , 0xa01fff) AM_WRITE(megadriv_68k_write_z80_ram)
AM_RANGE(0xa02000 , 0xa03fff) AM_WRITE(megadriv_68k_write_z80_ram)
AM_RANGE(0xa04000 , 0xa04003) AM_WRITE(megadriv_68k_YM2612_write)
AM_RANGE(0xa06000 , 0xa06001) AM_WRITE(megadriv_68k_z80_bank_write)
AM_RANGE(0xa10000 , 0xa1001f) AM_WRITE(megadriv_68k_io_write)
AM_RANGE(0xa11100 , 0xa11101) AM_WRITE(megadriv_68k_req_z80_bus)
AM_RANGE(0xa11200 , 0xa11201) AM_WRITE(megadriv_68k_req_z80_reset)
AM_RANGE(0xa15120 , 0xa1512f) AM_WRITE(_32x_68k_comms_w )
AM_RANGE(0xa15200 , 0xa153ff) AM_WRITE(_32x_68k_palette_w )
AM_RANGE(0xc00000 , 0xc0001f) AM_WRITE(megadriv_vdp_w)
AM_RANGE(0xd00000 , 0xd0001f) AM_WRITE(megadriv_vdp_w)
AM_RANGE(0xe00000 , 0xe0ffff) AM_WRITE(SMH_RAM) AM_MIRROR(0x1f0000) AM_BASE(&megadrive_ram)
static ADDRESS_MAP_START( sh2_slave_map, ADDRESS_SPACE_PROGRAM, 32 )
AM_RANGE(0x0000000 , 0x0003fff) AM_ROM
ADDRESS_MAP_END
static ADDRESS_MAP_START( sh2main_readmem, ADDRESS_SPACE_PROGRAM, 32 )
AM_RANGE(0x0000000 , 0x0003fff) AM_READ(SMH_ROM)
AM_RANGE(0x2000000 , 0x23fffff) AM_READ(SMH_BANK4)
ADDRESS_MAP_END
static ADDRESS_MAP_START( sh2main_writemem, ADDRESS_SPACE_PROGRAM, 32 )
AM_RANGE(0x0000000 , 0x0003fff) AM_WRITE(SMH_ROM)
AM_RANGE(0x2000000 , 0x23fffff) AM_WRITE(SMH_ROM)
ADDRESS_MAP_END
static ADDRESS_MAP_START( sh2slave_readmem, ADDRESS_SPACE_PROGRAM, 32 )
AM_RANGE(0x0000000 , 0x0003fff) AM_READ(SMH_ROM)
AM_RANGE(0x2000000 , 0x23fffff) AM_READ(SMH_BANK4)
ADDRESS_MAP_END
static ADDRESS_MAP_START( sh2slave_writemem, ADDRESS_SPACE_PROGRAM, 32 )
AM_RANGE(0x0000000 , 0x0003fff) AM_WRITE(SMH_ROM)
AM_RANGE(0x2000000 , 0x23fffff) AM_WRITE(SMH_ROM)
static ADDRESS_MAP_START( segacd_map, ADDRESS_SPACE_PROGRAM, 16 )
AM_RANGE(0x0000000 , 0x0003fff) AM_RAM
ADDRESS_MAP_END
@ -4772,8 +4703,8 @@ static TIMER_CALLBACK( scanline_timer_callback )
if (genesis_has_z80)
{
if (genesis_has_z80)
{
if (genesis_scanline_counter==megadrive_z80irq_scanline)
{
if ((genz80.z80_has_bus==1) && (genz80.z80_is_reset==0)) cpunum_set_input_line(machine, 1,0,HOLD_LINE);
@ -4782,7 +4713,7 @@ if (genesis_has_z80)
{
cpunum_set_input_line(machine, 1,0,CLEAR_LINE);
}
}
}
}
else /* pretend we're still on the same scanline to compensate for rounding errors */
@ -4819,6 +4750,8 @@ MACHINE_RESET( megadriv )
/* default state of z80 = reset, with bus */
mame_printf_debug("Resetting Megadrive / Genesis\n");
switch (input_port_read_safe(machine, "REGION", 0x00))
{
@ -4851,16 +4784,16 @@ MACHINE_RESET( megadriv )
break;
}
if (genesis_has_z80)
{
genz80.z80_is_reset = 1;
cpunum_set_input_line(machine, genz80.z80_cpunum, INPUT_LINE_RESET, ASSERT_LINE);
genz80.z80_has_bus = 1;
cpunum_set_input_line(machine, genz80.z80_cpunum, INPUT_LINE_HALT, CLEAR_LINE);
genz80.z80_bank_pos = 0;
genz80.z80_bank_addr = 0;
genesis_scanline_counter = -1;
}
if (genesis_has_z80)
{
genz80.z80_is_reset = 1;
cpunum_set_input_line(machine, genz80.z80_cpunum, INPUT_LINE_RESET, ASSERT_LINE);
genz80.z80_has_bus = 1;
cpunum_set_input_line(machine, genz80.z80_cpunum, INPUT_LINE_HALT, CLEAR_LINE);
genz80.z80_bank_pos = 0;
genz80.z80_bank_addr = 0;
genesis_scanline_counter = -1;
}
megadrive_imode = 0;
@ -4876,14 +4809,14 @@ if (genesis_has_z80)
timer_adjust_oneshot(frame_timer, attotime_zero, 0);
timer_adjust_oneshot(scanline_timer, attotime_zero, 0);
if (genesis_other_hacks)
{
// set_refresh_rate(megadriv_framerate);
cpunum_set_clockscale(machine, 0, 0.9950f); /* Fatal Rewind is very fussy... */
// cpunum_set_clockscale(machine, 0, 0.3800f); /* Fatal Rewind is very fussy... */
if (genesis_other_hacks)
{
// set_refresh_rate(megadriv_framerate);
cpunum_set_clockscale(machine, 0, 0.9950f); /* Fatal Rewind is very fussy... */
// cpunum_set_clockscale(machine, 0, 0.3800f); /* Fatal Rewind is very fussy... */
memset(megadrive_ram,0x00,0x10000);
}
memset(megadrive_ram,0x00,0x10000);
}
irq4counter = -1;
megadrive_total_scanlines = 262;
@ -4892,6 +4825,24 @@ if (genesis_other_hacks)
megadrive_z80irq_scanline = 226;
/* if any of these extra CPUs exist, pause them until we actually turn them on */
if (_32x_master_cpu_number != -1)
{
cpunum_set_input_line(machine, _32x_master_cpu_number, INPUT_LINE_RESET, ASSERT_LINE);
cpunum_set_input_line(machine, _32x_master_cpu_number, INPUT_LINE_HALT, ASSERT_LINE);
}
if (_32x_slave_cpu_number != -1)
{
cpunum_set_input_line(machine, _32x_slave_cpu_number, INPUT_LINE_RESET, ASSERT_LINE);
cpunum_set_input_line(machine, _32x_slave_cpu_number, INPUT_LINE_HALT, ASSERT_LINE);
}
if (_segacd_68k_cpu_number != -1 )
{
cpunum_set_input_line(machine, _segacd_68k_cpu_number, INPUT_LINE_RESET, ASSERT_LINE);
cpunum_set_input_line(machine, _segacd_68k_cpu_number, INPUT_LINE_HALT, ASSERT_LINE);
}
}
@ -5094,7 +5045,7 @@ MACHINE_DRIVER_START( megadriv )
MDRV_CPU_PROGRAM_MAP(megadriv_readmem,megadriv_writemem)
/* IRQs are handled via the timers */
MDRV_CPU_ADD("sound", Z80, MASTER_CLOCK_NTSC / 15) /* 3.58 MHz */
MDRV_CPU_ADD("genesis_snd_z80", Z80, MASTER_CLOCK_NTSC / 15) /* 3.58 MHz */
MDRV_CPU_PROGRAM_MAP(z80_readmem,z80_writemem)
MDRV_CPU_IO_MAP(z80_portmap,0)
/* IRQ handled via the timers */
@ -5152,18 +5103,36 @@ MACHINE_DRIVER_START( megadpal )
MDRV_SCREEN_REFRESH_RATE(50)
MACHINE_DRIVER_END
MACHINE_DRIVER_START( _32x )
static const sh2_cpu_core sh2_conf_master = { 0, NULL };
static const sh2_cpu_core sh2_conf_slave = { 1, NULL };
MACHINE_DRIVER_START( genesis_32x )
MDRV_IMPORT_FROM(megadriv)
MDRV_CPU_MODIFY("main")
MDRV_CPU_PROGRAM_MAP(_32x_readmem,_32x_writemem)
MDRV_CPU_ADD("SH2main", SH2, 10000000 )
MDRV_CPU_PROGRAM_MAP(sh2main_readmem,sh2main_writemem)
MDRV_CPU_ADD("32x_master_sh2", SH2, (MASTER_CLOCK_NTSC*3)/7 )
MDRV_CPU_PROGRAM_MAP(sh2_main_map, 0)
MDRV_CPU_CONFIG(sh2_conf_master)
MDRV_CPU_ADD("SH2slave", SH2, 10000000 )
MDRV_CPU_PROGRAM_MAP(sh2slave_readmem,sh2slave_writemem)
MDRV_CPU_ADD("32x_slave_sh2", SH2, (MASTER_CLOCK_NTSC*3)/7 )
MDRV_CPU_PROGRAM_MAP(sh2_slave_map, 0)
MDRV_CPU_CONFIG(sh2_conf_slave)
MACHINE_DRIVER_END
MACHINE_DRIVER_START( genesis_scd )
MDRV_IMPORT_FROM(megadriv)
MDRV_CPU_ADD("segacd_68k", M68000, SEGACD_CLOCK ) /* 12.5 MHz */
MDRV_CPU_PROGRAM_MAP(segacd_map,0)
MACHINE_DRIVER_END
MACHINE_DRIVER_START( genesis_32x_scd )
MDRV_IMPORT_FROM(genesis_32x)
MDRV_CPU_ADD("segacd_68k", M68000, SEGACD_CLOCK ) /* 12.5 MHz */
MDRV_CPU_PROGRAM_MAP(segacd_map,0)
MACHINE_DRIVER_END
/* Callback when the genesis enters interrupt code */
static IRQ_CALLBACK(genesis_int_callback)
{
@ -5188,15 +5157,45 @@ static int megadriv_tas_callback(void)
static void megadriv_init_common(running_machine *machine)
{
/* Look to see if this system has the standard Sound Z80 */
_genesis_snd_z80_cpu_number = mame_find_cpu_index(machine, "genesis_snd_z80");
if (_genesis_snd_z80_cpu_number != -1)
{
printf("GENESIS Sound Z80 cpu found %d\n", _genesis_snd_z80_cpu_number );
genesis_has_z80 = 1;
}
else
{
genesis_has_z80 = 0;
}
/* Look to see if this system has the 32x Master SH2 */
_32x_master_cpu_number = mame_find_cpu_index(machine, "32x_master_sh2");
if (_32x_master_cpu_number != -1)
{
printf("32x MASTER SH2 cpu found %d\n", _32x_master_cpu_number );
}
/* Look to see if this system has the 32x Slave SH2 */
_32x_slave_cpu_number = mame_find_cpu_index(machine, "32x_slave_sh2");
if (_32x_slave_cpu_number != -1)
{
printf("32x SLAVE SH2 cpu found %d\n", _32x_slave_cpu_number );
}
_segacd_68k_cpu_number = mame_find_cpu_index(machine, "segacd_68k");
if (_segacd_68k_cpu_number != -1)
{
printf("Sega CD secondary 68k cpu found %d\n", _segacd_68k_cpu_number );
}
if (genesis_has_z80)
{
genz80.z80_cpunum = 1;
genz80.z80_prgram = auto_malloc(0x2000);
memory_set_bankptr( 1, genz80.z80_prgram );
}
if (genesis_has_z80)
{
genz80.z80_cpunum = 1;
genz80.z80_prgram = auto_malloc(0x2000);
memory_set_bankptr( 1, genz80.z80_prgram );
}
cpunum_set_irq_callback(0, genesis_int_callback);
megadriv_backupram = NULL;
@ -5243,7 +5242,6 @@ if (genesis_has_z80)
DRIVER_INIT( megadriv_c2 )
{
genvdp_use_cram = 0;
genesis_has_z80 = 0;
genesis_always_irq6 = 1;
genesis_other_hacks = 0;
@ -5258,7 +5256,6 @@ DRIVER_INIT( megadriv_c2 )
DRIVER_INIT( megadriv )
{
genvdp_use_cram = 1;
genesis_has_z80 = 1;
genesis_always_irq6 = 0;
genesis_other_hacks = 1;
@ -5271,7 +5268,6 @@ DRIVER_INIT( megadriv )
DRIVER_INIT( megadrij )
{
genvdp_use_cram = 1;
genesis_has_z80 = 1;
genesis_always_irq6 = 0;
genesis_other_hacks = 1;
@ -5284,7 +5280,6 @@ DRIVER_INIT( megadrij )
DRIVER_INIT( megadrie )
{
genvdp_use_cram = 1;
genesis_has_z80 = 1;
genesis_always_irq6 = 0;
genesis_other_hacks = 1;
@ -5297,7 +5292,6 @@ DRIVER_INIT( megadrie )
DRIVER_INIT( megadsvp )
{
genvdp_use_cram = 1;
genesis_has_z80 = 1;
genesis_always_irq6 = 0;
genesis_other_hacks = 1;
@ -5361,3 +5355,63 @@ void megatech_set_megadrive_z80_as_megadrive_z80(running_machine *machine)
memory_install_readwrite8_handler(machine, 1, ADDRESS_SPACE_PROGRAM, 0x8000, 0xffff, 0, 0, z80_read_68k_banked_data, z80_write_68k_banked_data);
}
#if 0
DRIVER_INIT( _32x )
{
memory_install_readwrite16_handler(machine, 0, ADDRESS_SPACE_PROGRAM, 0x0000000, 0x03fffff, 0, 0, SMH_BANK10, SMH_BANK10);
memory_set_bankptr( 10, memory_region(machine, "gamecart") );
memory_install_readwrite16_handler(machine, 0, ADDRESS_SPACE_PROGRAM, 0x0880000, 0x08fffff, 0, 0, SMH_BANK11, SMH_BANK11); // 'fixed' 512kb rom bank
memory_set_bankptr( 11, memory_region(machine, "gamecart") );
memory_install_readwrite16_handler(machine, 0, ADDRESS_SPACE_PROGRAM, 0x0900000, 0x09fffff, 0, 0, SMH_BANK12, SMH_BANK12); // 'bankable' 1024kb rom bank
memory_set_bankptr( 12, memory_region(machine, "gamecart") );
// memory_install_readwrite16_handler(machine, 0, ADDRESS_SPACE_PROGRAM, 0x0000000, 0x00000ff, 0, 0, SMH_BANK10, SMH_BANK10);
// memory_install_readwrite16_handler(machine, 0, ADDRESS_SPACE_PROGRAM, 0x0000100, 0x03fffff, 0, 0, SMH_NOP, SMH_NOP );
// memory_set_bankptr( 10, memory_region(machine, "32x_68k_bios") );
DRIVER_INIT_CALL(megadriv);
}
ROM_START( 32x_bios )
ROM_REGION16_BE( 0x400000, "main", ROMREGION_ERASE00 )
ROM_REGION16_BE( 0x400000, "gamecart", 0 ) /* 68000 Code */
ROM_LOAD( "32x_babe.rom", 0x000000, 0x014f80, CRC(816b0cb4) SHA1(dc16d3170d5809b57192e03864b7136935eada64) )
ROM_REGION16_BE( 0x400000, "32x_68k_bios", 0 ) /* 68000 Code */
ROM_LOAD( "32x_g_bios.bin", 0x000000, 0x000100, CRC(5c12eae8) SHA1(dbebd76a448447cb6e524ac3cb0fd19fc065d944) )
ROM_REGION( 0x400000, "32x_master_sh2", 0 ) /* SH2 Code */
ROM_LOAD( "32x_m_bios.bin", 0x000000, 0x000800, CRC(dd9c46b8) SHA1(1e5b0b2441a4979b6966d942b20cc76c413b8c5e) )
ROM_REGION( 0x400000, "32x_slave_sh2", 0 ) /* SH2 Code */
ROM_LOAD( "32x_s_bios.bin", 0x000000, 0x000400, CRC(bfda1fe5) SHA1(4103668c1bbd66c5e24558e73d4f3f92061a109a) )
ROM_END
ROM_START( segacd )
ROM_REGION16_BE( 0x400000, "main", ROMREGION_ERASE00 )
ROM_LOAD( "segacd_model2_bios_2_11_u.bin", 0x000000, 0x020000, CRC(2e49d72c) SHA1(328a3228c29fba244b9db2055adc1ec4f7a87e6b) )
ROM_END
/* some games use the 32x and SegaCD together to give better quality FMV */
ROM_START( 32x_scd )
ROM_REGION16_BE( 0x400000, "main", ROMREGION_ERASE00 )
ROM_REGION16_BE( 0x400000, "gamecart", 0 ) /* 68000 Code */
ROM_LOAD( "segacd_model2_bios_2_11_u.bin", 0x000000, 0x020000, CRC(2e49d72c) SHA1(328a3228c29fba244b9db2055adc1ec4f7a87e6b) )
ROM_REGION16_BE( 0x400000, "32x_68k_bios", 0 ) /* 68000 Code */
ROM_LOAD( "32x_g_bios.bin", 0x000000, 0x000100, CRC(5c12eae8) SHA1(dbebd76a448447cb6e524ac3cb0fd19fc065d944) )
ROM_REGION( 0x400000, "32x_master_sh2", 0 ) /* SH2 Code */
ROM_LOAD( "32x_m_bios.bin", 0x000000, 0x000800, CRC(dd9c46b8) SHA1(1e5b0b2441a4979b6966d942b20cc76c413b8c5e) )
ROM_REGION( 0x400000, "32x_slave_sh2", 0 ) /* SH2 Code */
ROM_LOAD( "32x_s_bios.bin", 0x000000, 0x000400, CRC(bfda1fe5) SHA1(4103668c1bbd66c5e24558e73d4f3f92061a109a) )
ROM_END
GAME( 1994, 32x_bios, 0, genesis_32x, megadriv, _32x, ROT0, "Sega", "32X Bios", GAME_NOT_WORKING )
GAME( 1994, segacd, 0, genesis_scd, megadriv, megadriv,ROT0, "Sega", "Sega-CD Model 2 BIOS V2.11 (U)", GAME_NOT_WORKING )
GAME( 1994, 32x_scd, 0, genesis_32x_scd, megadriv, _32x, ROT0, "Sega", "Sega-CD Model 2 BIOS V2.11 (U) (with 32X)", GAME_NOT_WORKING )
#endif