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bus/nes: Removed bogus mirroring and banking bits from NAMCOT 3446. (#8768)

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0kmg 2021-10-28 19:08:50 -08:00 committed by GitHub
parent 53b35e7c59
commit 4ea2a2d528
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 5 additions and 14 deletions
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19
src/devices/bus/nes/namcot.cpp
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@ -296,7 +296,6 @@ void nes_namcot3433_device::dxrom_write(offs_t offset, uint8_t data)
}
}
/*-------------------------------------------------
Namcot 3446 board emulation
@ -313,31 +312,23 @@ void nes_namcot3446_device::write_h(offs_t offset, uint8_t data)
{
LOG_MMC(("namcot3446 write_h, offset: %04x, data: %02x\n", offset, data));
// NEStopia does not have this!
if (offset >= 0x2000)
{
if (!(offset & 1))
set_nt_mirroring(BIT(data, 0) ? PPU_MIRROR_HORZ : PPU_MIRROR_VERT);
return;
}
switch (offset & 1)
if (offset & 1)
{
case 1:
switch (m_latch & 0x07)
switch (m_latch & 0x07)
{
case 2: chr2_0(data, CHRROM); break;
case 3: chr2_2(data, CHRROM); break;
case 4: chr2_4(data, CHRROM); break;
case 5: chr2_6(data, CHRROM); break;
case 6: BIT(m_latch, 6) ? prg8_cd(data) : prg8_89(data); break;
case 6: prg8_89(data); break;
case 7: prg8_ab(data); break;
}
break;
case 0:
m_latch = data;
break;
}
else
m_latch = data;
}
/*-------------------------------------------------