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Adjusted writes to 2004 based on Wiki info

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This commit is contained in:
Souryo 2015-07-25 17:05:56 -04:00
parent b8380352f2
commit b2b9a5bd8d
1 changed files with 8 additions and 2 deletions
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6
Core/PPU.cpp
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@ -109,8 +109,14 @@ void PPU::WriteRAM(uint16_t addr, uint8_t value)
_state.SpriteRamAddr = value;
break;
case PPURegisters::SpriteData:
if(_scanline >= 240 || !IsRenderingEnabled()) {
_spriteRAM[_state.SpriteRamAddr] = value;
_state.SpriteRamAddr = (_state.SpriteRamAddr + 1) & 0xFF;
} else {
//"Writes to OAMDATA during rendering (on the pre-render line and the visible lines 0-239, provided either sprite or background rendering is enabled) do not modify values in OAM,
//but do perform a glitchy increment of OAMADDR, bumping only the high 6 bits"
_state.SpriteRamAddr += 4;
}
break;
case PPURegisters::ScrollOffsets:
if(_state.WriteToggle) {