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// license:BSD-3-Clause
// copyright-holders:Fabio Priuli
/***********************************************************************************************************
NES/Famicom cartridge emulation for Somari Team PCBs
Here we emulate the Somari Team PCBs [mapper 116]
***********************************************************************************************************/
#include "emu.h"
#include "somari.h"
#ifdef NES_PCB_DEBUG
#define VERBOSE (LOG_GENERAL)
#else
#define VERBOSE (0)
#endif
#include "logmacro.h"
#define SOMARI_VRC2_MODE 0
#define SOMARI_MMC3_MODE 1
#define SOMARI_MMC1_MODE 2
//-------------------------------------------------
// constructor
//-------------------------------------------------
DEFINE_DEVICE_TYPE(NES_SOMARI, nes_somari_device, "nes_somari", "NES Cart Team Somari PCB")
DEFINE_DEVICE_TYPE(NES_HUANG2, nes_huang2_device, "nes_huang2", "NES Cart Huang-2 PCB")
nes_somari_device::nes_somari_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, u32 clock, u8 mmc1_prg_shift)
: nes_txrom_device(mconfig, type, tag, owner, clock), m_board_mode(0), m_mmc1_count(0), m_mmc1_latch(0), m_mmc1_prg_shift(mmc1_prg_shift), m_vrc_mirror(0)
{
}
nes_somari_device::nes_somari_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock)
: nes_somari_device(mconfig, NES_SOMARI, tag, owner, clock, 0)
{
}
nes_huang2_device::nes_huang2_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock)
: nes_somari_device(mconfig, NES_HUANG2, tag, owner, clock, 1)
{
}
void nes_somari_device::device_start()
{
mmc3_start();
save_item(NAME(m_board_mode));
// MMC1
save_item(NAME(m_mmc1_count));
save_item(NAME(m_mmc1_latch));
save_item(NAME(m_mmc1_reg));
// VRC2
save_item(NAME(m_vrc_prg_bank));
save_item(NAME(m_vrc_vrom_bank));
save_item(NAME(m_vrc_mirror));
}
void nes_somari_device::pcb_reset()
{
m_board_mode = SOMARI_MMC3_MODE;
mmc3_common_initialize(0xff, 0xff, 0);
// MMC1 regs
m_mmc1_count = 0;
m_mmc1_latch = 0;
m_mmc1_reg[0] = 0x0c;
m_mmc1_reg[1] = 0x00;
m_mmc1_reg[2] = 0x00;
m_mmc1_reg[3] = 0x00;
// VRC2 regs
m_vrc_prg_bank[0] = m_vrc_prg_bank[1] = 0;
m_vrc_mirror = 0;
std::fill(std::begin(m_vrc_vrom_bank), std::end(m_vrc_vrom_bank), 0xff); // Somari (original release) glitches on "Somari Team Presents" screen without this
}
/*-------------------------------------------------
mapper specific handlers
-------------------------------------------------*/
/*-------------------------------------------------
SOMERI TEAM
Games: Somari, Kart Fighter, Garou Densetsu Special,
AV Bishoujo Senshi, AV Kyuukyoku Mahjong 2
Like Rex Soft's SL-1632 these boards use Huang chips
which simulate the behavior of MMC1, MMC3, and VRC2.
There is a second revision, Huang-2, that appears to
only have been used for AV Kyuukyoku Mahjong 2. Its
MMC1 mode has nonstandard PRG banking.
iNES: mapper 116
Emulation note about regs in MAME: currently,
- m_mmc_prg_bank[n] for n=0,...,3 represent the MMC3 PRG banks (inherited from base class)
- m_mmc_vrom_bank[n] for n=0,...,5 represent the MMC3 CHR banks (inherited from base class)
- m_mmc1_reg[n] for n=0,1,2,3 represent the MMC1 regs
- m_mmc1_count and m_mmc1_latch are additional variables for MMC1 (notice that MMC3 uses a diff m_latch!)
- m_vrc_prg_bank[n] for n=0,1 represent the VRC2 PRG banks
- m_vrc_vrom_bank[n] for n=0,...,7 represent the VRC2 CHR banks
In MAME: Supported.
-------------------------------------------------*/
// MMC1 Mode emulation
void nes_somari_device::mmc1_reset_latch()
{
m_mmc1_count = 0;
m_mmc1_reg[0] |= 0x0c;
update_prg();
}
void nes_somari_device::mmc1_w(offs_t offset, u8 data)
{
if (BIT(data, 7))
mmc1_reset_latch();
else
{
m_mmc1_latch = (data & 1) << 4 | m_mmc1_latch >> 1;
m_mmc1_count = (m_mmc1_count + 1) % 5;
if (!m_mmc1_count)
{
m_mmc1_reg[BIT(offset, 13, 2)] = m_mmc1_latch;
update_all_banks();
}
}
}
// VRC2 Mode emulation
void nes_somari_device::vrc2_w(offs_t offset, u8 data)
{
switch (offset & 0x7000)
{
case 0x0000:
case 0x2000:
m_vrc_prg_bank[BIT(offset, 13)] = data & 0x1f;
update_prg();
break;
case 0x1000:
m_vrc_mirror = data;
update_mirror();
break;
case 0x3000:
case 0x4000:
case 0x5000:
case 0x6000:
{
u8 bank = ((offset >> 12) - 3) * 2 + BIT(offset, 1);
u8 shift = (offset & 1) << 2;
u8 mask = 0x0f << shift;
m_vrc_vrom_bank[bank] = (m_vrc_vrom_bank[bank] & ~mask) | ((data << shift) & mask);
update_chr();
break;
}
}
}
void nes_somari_device::update_prg()
{
switch (m_board_mode)
{
case SOMARI_VRC2_MODE:
prg8_89(m_vrc_prg_bank[0]);
prg8_ab(m_vrc_prg_bank[1]);
prg16_cdef(m_prg_chunks - 1);
break;
case SOMARI_MMC3_MODE:
set_prg(m_prg_base, m_prg_mask);
break;
case SOMARI_MMC1_MODE:
switch (BIT(m_mmc1_reg[0], 2, 2))
{
case 0:
case 1:
prg32(m_mmc1_reg[3] >> 1);
break;
case 2:
prg16_89ab(0);
prg16_cdef(m_mmc1_reg[3] >> m_mmc1_prg_shift);
break;
case 3:
prg16_89ab(m_mmc1_reg[3] >> m_mmc1_prg_shift);
prg16_cdef(0x0f >> m_mmc1_prg_shift);
break;
}
break;
}
}
void nes_somari_device::update_chr()
{
switch (m_board_mode)
{
case SOMARI_VRC2_MODE:
for (int i = 0; i < 8; i++)
chr1_x(i, m_chr_base | m_vrc_vrom_bank[i], CHRROM);
break;
case SOMARI_MMC3_MODE:
set_chr(m_chr_source, m_chr_base, m_chr_mask);
break;
case SOMARI_MMC1_MODE:
if (BIT(m_mmc1_reg[0], 4))
{
chr4_0(m_mmc1_reg[1] & 0x1f, CHRROM);
chr4_4(m_mmc1_reg[2] & 0x1f, CHRROM);
}
else
chr8(BIT(m_mmc1_reg[1], 1, 4), CHRROM);
break;
}
}
void nes_somari_device::update_mirror()
{
switch (m_board_mode)
{
case SOMARI_VRC2_MODE:
set_nt_mirroring(m_vrc_mirror & 1 ? PPU_MIRROR_HORZ : PPU_MIRROR_VERT);
break;
case SOMARI_MMC3_MODE:
set_nt_mirroring(m_mmc_mirror & 1 ? PPU_MIRROR_HORZ : PPU_MIRROR_VERT);
break;
case SOMARI_MMC1_MODE:
switch (m_mmc1_reg[0] & 0x03)
{
case 0x00: set_nt_mirroring(PPU_MIRROR_LOW); break;
case 0x01: set_nt_mirroring(PPU_MIRROR_HIGH); break;
case 0x02: set_nt_mirroring(PPU_MIRROR_VERT); break;
case 0x03: set_nt_mirroring(PPU_MIRROR_HORZ); break;
}
break;
}
}
void nes_somari_device::write_h(offs_t offset, u8 data)
{
LOG("somari write_h, mode %d, offset: %04x, data: %02x\n", m_board_mode, offset, data);
switch (m_board_mode)
{
case SOMARI_VRC2_MODE: vrc2_w(offset, data); break;
case SOMARI_MMC3_MODE: txrom_write(offset, data); break;
case SOMARI_MMC1_MODE: mmc1_w(offset, data); break;
}
}
void nes_somari_device::update_all_banks()
{
update_mirror();
update_prg();
update_chr();
}
void nes_somari_device::write_m(offs_t offset, u8 data)
{
LOG("somari write_m, offset: %04x, data: %02x\n", offset, data);
if (offset & 0x100)
{
m_board_mode = std::min(data & 0x03, SOMARI_MMC1_MODE);
if (m_board_mode == SOMARI_MMC1_MODE)
mmc1_reset_latch(); // Garou crashes between fights without this
m_chr_base = (data & 0x04) << 6;
if (m_board_mode != SOMARI_MMC3_MODE)
{
m_irq_enable = 0;
set_irq_line(CLEAR_LINE);
}
update_all_banks();
}
}
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