void nes_pxrom_device::ppu_latch(offs_t offset)
{
if ((offset & 0x3ff0) == 0x0fd0)
{
LOG_MMC(("mmc2 vrom latch switch (bank 0 low): %02x\n", m_reg[0]));
m_latch1 = 0xfd;
chr4_0(m_reg[0], CHRROM);
}
else if ((offset & 0x3ff0) == 0x0fe0)
{
LOG_MMC(("mmc2 vrom latch switch (bank 0 high): %02x\n", m_reg[1]));
m_latch1 = 0xfe;
chr4_0(m_reg[1], CHRROM);
}
else if ((offset & 0x3ff0) == 0x1fd0)
{
LOG_MMC(("mmc2 vrom latch switch (bank 1 low): %02x\n", m_reg[2]));
m_latch2 = 0xfd;
chr4_4(m_reg[2], CHRROM);
}
else if ((offset & 0x3ff0) == 0x1fe0)
{
LOG_MMC(("mmc2 vrom latch switch (bank 0 high): %02x\n", m_reg[3]));
m_latch2 = 0xfe;
chr4_4(m_reg[3], CHRROM);
}
}
void nes_cprom_device::pcb_reset()
{
m_chr_source = CHRRAM;
prg32(0);
chr4_0(0, m_chr_source);
chr4_4(0, m_chr_source);
}
void nes_nanjing_device::hblank_irq(int scanline, int vblank, int blanked)
{
if (BIT(m_reg[0], 7))
{
if (scanline == 127)
{
chr4_0(1, CHRRAM);
chr4_4(1, CHRRAM);
}
if (scanline == 239)
{
chr4_0(0, CHRRAM);
chr4_4(0, CHRRAM);
}
}
}
void nes_oekakids_device::pcb_reset()
{
prg32(0);
chr4_0(0, CHRRAM);
chr4_4(3, CHRRAM);
set_nt_mirroring(PPU_MIRROR_LOW);
m_latch = 0;
m_reg = 0;
}
void nes_racermate_device::pcb_reset()
{
// m_chr_source = m_vrom_chunks ? CHRROM : CHRRAM;
prg16_89ab(0);
prg16_cdef(m_prg_chunks - 1);
chr4_0(0, CHRRAM);
chr4_4(0, CHRRAM);
m_latch = 0;
}
void nes_sxrom_device::set_chr()
{
UINT8 chr_mode = BIT(m_reg[0], 4);
if (chr_mode)
{
chr4_0(m_reg[1] & 0x1f, m_chr_source);
chr4_4(m_reg[2] & 0x1f, m_chr_source);
}
else
chr8((m_reg[1] & 0x1f) >> 1, m_chr_source);
}
void nes_oekakids_device::update_chr()
{
chr4_0(m_reg | m_latch, CHRRAM);
chr4_4(m_reg | 0x03, CHRRAM);
}