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make the bootleg run a bit at least (nw)

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This commit is contained in:
David Haywood 2015-11-03 00:37:43 +00:00
parent 43881b4c24
commit f0aab6ad54
3 changed files with 23 additions and 12 deletions
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17
src/mame/drivers/vsnes.c
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@ -214,9 +214,7 @@ static ADDRESS_MAP_START( vsnes_cpu2_map, AS_PROGRAM, 8, vsnes_state )
AM_RANGE(0x8000, 0xffff) AM_ROM
ADDRESS_MAP_END
// likely doesn't have the PSGs
// they wait on 0x2002 to change, if you toggle that the game runs with no sprites, it does still play music tho
// but I think the real bootleg board uses the z80 and alt sound hardware instead?
// the bootleg still makes writes to the PSG addresses but doesn't have the N2A03 so they likely go unused with the Z80 side providing sound instead
static ADDRESS_MAP_START( vsnes_cpu1_bootleg_map, AS_PROGRAM, 8, vsnes_state )
AM_RANGE(0x0000, 0x07ff) AM_MIRROR(0x1800) AM_RAM AM_SHARE("work_ram")
AM_RANGE(0x2000, 0x3fff) AM_DEVREADWRITE("ppu1", ppu2c0x_device, read, write)
@ -1780,13 +1778,13 @@ MACHINE_CONFIG_END
static MACHINE_CONFIG_START( vsnes_bootleg, vsnes_state )
/* basic machine hardware */
MCFG_CPU_ADD("maincpu", M6502,N2A03_DEFAULTCLOCK) // R6502AP
MCFG_CPU_ADD("maincpu", M6502,XTAL_16MHz/4) // 4mhz? seems too high but flickers badly otherwise, issue elsewhere?
MCFG_CPU_PROGRAM_MAP(vsnes_cpu1_bootleg_map)
/* some carts also trigger IRQs */
MCFG_MACHINE_RESET_OVERRIDE(vsnes_state,vsnes)
MCFG_MACHINE_START_OVERRIDE(vsnes_state,vsnes)
MCFG_CPU_ADD("subcpu", Z80,4000000) /* ? MHz */ // Z8400APS-Z80CPU
MCFG_CPU_ADD("subcpu", Z80,XTAL_16MHz/4) /* ? MHz */ // Z8400APS-Z80CPU
MCFG_CPU_PROGRAM_MAP(vsnes_bootleg_z80_map)
MCFG_CPU_VBLANK_INT_DRIVER("screen1", vsnes_state, irq0_line_hold)
@ -1807,6 +1805,7 @@ static MACHINE_CONFIG_START( vsnes_bootleg, vsnes_state )
MCFG_PPU2C0X_CPU("maincpu")
MCFG_PPU2C0X_SET_SCREEN("screen1")
MCFG_PPU2C0X_SET_NMI(vsnes_state, ppu_irq_1)
MCFG_PPU2C0X_IGNORE_SPRITE_WRITE_LIMIT // bootleg seems to need this - code to set the sprite address is replaced with complete copy loops??
/* sound hardware */
MCFG_SPEAKER_STANDARD_MONO("mono")
@ -1891,8 +1890,8 @@ ROM_START( suprmrioa ) /* Vs. Super Mario Bros. (Set unknown, possibly operator
PALETTE_2C04_0004
ROM_END
/* I don't know what the Z80 is for on these (located top-left of the PCB with rom 1) */
/* PCB is also marked for a plain 6502, I can't see from the image what is there tho */
ROM_START( suprmriobl2 )
ROM_REGION( 0x10000,"maincpu", 0 ) /* 6502 memory */
ROM_LOAD( "4-27256.bin", 0x8000, 0x8000, CRC(663b1753) SHA1(b0d2057c4545f2d6534cafb16086826c8ba49f5a) )
@ -2747,8 +2746,8 @@ GAME( 1986, rbibb, 0, vsnes, rbibb, vsnes_state, rbibb, ROT0,
GAME( 1986, rbibba, rbibb, vsnes, rbibb, vsnes_state, rbibb, ROT0, "Namco", "Vs. Atari R.B.I. Baseball (set 2)", 0 )
GAME( 1986, suprmrio, 0, vsnes, suprmrio, vsnes_state, vsnormal, ROT0, "Nintendo", "Vs. Super Mario Bros. (set SM4-4 E)", 0 )
GAME( 1986, suprmrioa,suprmrio, vsnes, suprmrio, vsnes_state, vsnormal, ROT0, "Nintendo", "Vs. Super Mario Bros. (set ?, harder)", 0 )
GAME( 1986, suprmriobl,suprmrio,vsnes_bootleg,suprmrio,vsnes_state,vsnormal, ROT0, "bootleg", "Vs. Super Mario Bros. (bootleg with Z80, set 1)", MACHINE_NOT_WORKING )
GAME( 1986, suprmriobl2,suprmrio,vsnes_bootleg,suprmrio,vsnes_state,vsnormal, ROT0, "bootleg", "Vs. Super Mario Bros. (bootleg with Z80, set 2)", MACHINE_NOT_WORKING )
GAME( 1986, suprmriobl,suprmrio,vsnes_bootleg,suprmrio,vsnes_state,vsnormal, ROT0, "bootleg", "Vs. Super Mario Bros. (bootleg with Z80, set 1)", MACHINE_NOT_WORKING ) // timer starts at 200(!)
GAME( 1986, suprmriobl2,suprmrio,vsnes_bootleg,suprmrio,vsnes_state,vsnormal, ROT0, "bootleg", "Vs. Super Mario Bros. (bootleg with Z80, set 2)", MACHINE_NOT_WORKING ) // timer starts at 300
GAME( 1988, skatekds, suprmrio, vsnes, suprmrio, vsnes_state, vsnormal, ROT0, "hack (Two-Bit Score)", "Vs. Skate Kids. (Graphic hack of Super Mario Bros.)", 0 )
GAME( 1985, vsskykid, 0, vsnes, vsskykid, vsnes_state, MMC3, ROT0, "Namco", "Vs. Super SkyKid" , 0 )
GAME( 1987, tkoboxng, 0, vsnes, tkoboxng, vsnes_state, tkoboxng, ROT0, "Namco / Data East USA", "Vs. T.K.O. Boxing", 0 )

8
src/mame/video/ppu2c0x.c
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@ -141,7 +141,8 @@ ppu2c0x_device::ppu2c0x_device(const machine_config &mconfig, device_type type,
m_color_base(0),
m_scan_scale(1), // set the scan scale (this is for dual monitor vertical setups)
m_tilecount(0),
m_draw_phase(0)
m_draw_phase(0),
m_use_sprite_write_limitation(true)
{
for (int i = 0; i < PPU_MAX_REG; i++)
m_regs[i] = 0;
@ -1186,8 +1187,9 @@ WRITE8_MEMBER( ppu2c0x_device::write )
case PPU_SPRITE_DATA: /* 4 */
// If the PPU is currently rendering the screen, 0xff is written instead of the desired data.
if (m_scanline <= PPU_BOTTOM_VISIBLE_SCANLINE)
data = 0xff;
if (m_use_sprite_write_limitation)
if (m_scanline <= PPU_BOTTOM_VISIBLE_SCANLINE)
data = 0xff;
m_spriteram[m_regs[PPU_SPRITE_ADDRESS]] = data;
m_regs[PPU_SPRITE_ADDRESS] = (m_regs[PPU_SPRITE_ADDRESS] + 1) & 0xff;
break;

10
src/mame/video/ppu2c0x.h
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@ -116,6 +116,8 @@ enum
#define MCFG_PPU2C0X_SET_NMI(_class, _method) \
ppu2c0x_device::set_nmi_delegate(*device, ppu2c0x_nmi_delegate(&_class::_method, #_class "::" #_method, NULL, (_class *)0));
#define MCFG_PPU2C0X_IGNORE_SPRITE_WRITE_LIMIT \
ppu2c0x_device::use_sprite_write_limitation_disable(*device);
///*************************************************************************
// TYPE DEFINITIONS
@ -221,6 +223,14 @@ public:
emu_timer *m_nmi_timer; /* NMI timer */
emu_timer *m_scanline_timer; /* scanline timer */
// some bootleg / clone hardware appears to ignore this
static void use_sprite_write_limitation_disable(device_t &device)
{
ppu2c0x_device &dev = downcast<ppu2c0x_device &>(device);
dev.m_use_sprite_write_limitation = false;
}
bool m_use_sprite_write_limitation;
private:
static const device_timer_id TIMER_HBLANK = 0;
static const device_timer_id TIMER_NMI = 1;