text: // license:BSD-3-Clause
  // copyright-holders:Fabio Priuli
  /***********************************************************************************************************
  
  
   NES/Famicom cartridge emulation for NTDEC PCBs
  
  
   Here we emulate the following PCBs
  
   * NTDEC ASDER [mapper 112]
   * NTDEC Fighting Hero [mapper 193]
   * NTDEC N715021 [mapper 81]
  
   TODO:
   - why is Master Shooter not working? (correctly aimed shots score as a hit on random targets)
  
   ***********************************************************************************************************/
  
  
  #include "emu.h"
  #include "ntdec.h"
  
  
  #ifdef NES_PCB_DEBUG
  #define VERBOSE 1
  #else
  #define VERBOSE 0
  #endif
  
  #define LOG_MMC(x) do { if (VERBOSE) logerror x; } while (0)
  
  
  //-------------------------------------------------
  //  constructor
  //-------------------------------------------------
  
  DEFINE_DEVICE_TYPE(NES_NTDEC_ASDER,   nes_ntdec_asder_device,   "nes_ntdec_asder",   "NES Cart NTDEC Asder PCB")
  DEFINE_DEVICE_TYPE(NES_NTDEC_FH,      nes_ntdec_fh_device,      "nes_ntdec_fh",      "NES Cart NTDEC Fighting Hero PCB")
  DEFINE_DEVICE_TYPE(NES_NTDEC_N715021, nes_ntdec_n715021_device, "nes_ntdec_n715021", "NES Cart NTDEC N715021 PCB")
  
  
  nes_ntdec_asder_device::nes_ntdec_asder_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock)
  	: nes_nrom_device(mconfig, NES_NTDEC_ASDER, tag, owner, clock), m_latch(0), m_chr_outer(0)
  {
  }
  
  nes_ntdec_fh_device::nes_ntdec_fh_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock)
  	: nes_nrom_device(mconfig, NES_NTDEC_FH, tag, owner, clock)
  {
  }
  
  nes_ntdec_n715021_device::nes_ntdec_n715021_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock)
  	: nes_nrom_device(mconfig, NES_NTDEC_N715021, tag, owner, clock)
  {
  }
  
  
  
  
  void nes_ntdec_asder_device::device_start()
  {
  	common_start();
  	save_item(NAME(m_latch));
  	save_item(NAME(m_chr_outer));
  }
  
  void nes_ntdec_asder_device::pcb_reset()
  {
  	prg16_89ab(0);
  	prg16_cdef(m_prg_chunks - 1);
  	chr8(0, CHRROM);
  
  	m_latch = 0;
  	m_chr_outer = 0;
  }
  
  void nes_ntdec_fh_device::pcb_reset()
  {
  	prg32((m_prg_chunks - 1) >> 1);
  	chr8(0, CHRROM);
  	set_nt_mirroring(PPU_MIRROR_VERT);
  }
  
  void nes_ntdec_n715021_device::pcb_reset()
  {
  	prg16_89ab(0);
  	prg16_cdef(m_prg_chunks - 1);
  	chr8(0, CHRROM);
  }
  
  
  
  /*-------------------------------------------------
   mapper specific handlers
   -------------------------------------------------*/
  
  /*-------------------------------------------------
  
   NTDEC ASDER Bootleg Board
  
   Games: Cobra Mission, Fighting Hero III, Huang Di, Master
   Shooter
  
   This board supports swappable 8K PRG banks at 0x8000 and
   0xa000 via 2 registers. 16K above is fixed. CHR ROM is
   selected by 6 registers: 2x2K for the first two, and 4x1K
   for the remaining 4. The former can only address 256K of
   CHR while the latter combines with latch at 0xc000 to
   span 512K. Registers are not directly written to but
   selected at 0x8000.
  
   iNES: mapper 112
  
   In MAME: Supported.
  
   -------------------------------------------------*/
  
  void nes_ntdec_asder_device::write_h(offs_t offset, u8 data)
  {
  	LOG_MMC(("ntdec_asder write_h, offset: %04x, data: %02x\n", offset, data));
  
  	switch (offset & 0x6001)    // writes only at even addresses?
  	{
  		case 0x0000:
  			m_latch = data & 0x07;
  			break;
  		case 0x2000:
  			switch (m_latch)
  			{
  				case 0: case 1:
  					prg8_x(m_latch, data);
  					break;
  				case 2: case 3:
  					chr2_x((m_latch & 0x01) << 1, data >> 1, CHRROM);
  					break;
  				case 4: case 5: case 6: case 7:
  					u16 high = BIT(m_chr_outer, m_latch) << 8;
  					chr1_x(m_latch, high | data, CHRROM);
  					break;
  			}
  			break;
  		case 0x4000:
  			m_chr_outer = data;
  			break;
  		case 0x6000:
  			set_nt_mirroring(BIT(data, 0) ? PPU_MIRROR_HORZ : PPU_MIRROR_VERT);
  			break;
  	}
  }
  
  /*-------------------------------------------------
  
   Bootleg Board by NTDEC for Fighting Hero
  
   Games: Fighting Hero, War in the Gulf
  
   Very simple mapper: writes to 0x6000-0x7fff swap PRG and
   CHR banks. The mirroring register at 0x6004 appears to
   not be used by any known software?
  
   iNES: mapper 193
  
   In MAME: Supported.
  
   -------------------------------------------------*/
  
  void nes_ntdec_fh_device::write_m(offs_t offset, u8 data)
  {
  	LOG_MMC(("ntdec_fh write_m, offset: %04x, data: %02x\n", offset, data));
  
  	switch (offset & 0x07)
  	{
  		case 0:
  			chr4_0(data >> 2, CHRROM);
  			break;
  		case 1:
  			chr2_4(data >> 1, CHRROM);
  			break;
  		case 2:
  			chr2_6(data >> 1 , CHRROM);
  			break;
  		case 3:
  			prg8_89(data & 0x0f);
  			break;
  		case 4:
  			set_nt_mirroring(BIT(data, 0) ? PPU_MIRROR_HORZ : PPU_MIRROR_VERT);
  			break;
  	}
  }
  
  /*-------------------------------------------------
  
   NTDEC Board N715021
  
   Games: Super Gun
  
   Very simple mapper: writes to 0x8000-0xffff swap PRG and
   CHR banks. PCB also has a latch at 0x6000 but it is not used.
  
   iNES: mapper 81
  
   In MAME: Supported.
  
   -------------------------------------------------*/
  
  void nes_ntdec_n715021_device::write_h(offs_t offset, u8 data)
  {
  	LOG_MMC(("ntdec_n715021 write_h, offset: %04x, data: %02x\n", offset, data));
  	prg16_89ab((offset >> 2) & 0x03);
  	chr8(offset & 0x03, CHRROM);
  }
  