lauchmelder/NESEmulator
1
0
Fork 0
Code Issues Pull requests Actions Packages Projects Releases Wiki Activity

added ppu read latch

Browse source
This commit is contained in:
Lauchmelder 2021-10-30 19:42:17 +02:00
parent 2fdae00ff8
commit 9ab5ac3c13
2 changed files with 5 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
NES Emulator/ppu.c
View file

@ -131,7 +131,8 @@ Byte ppuRead(struct PPU* ppu, Word addr)
{
if (ppu->ppuAddress.raw < 0x2000)
{
val = readCartridgePPU(ppu->bus->cartridge, ppu->ppuAddress.raw);
val = ppu->ppuReadLatch;
ppu->ppuReadLatch = readCartridgePPU(ppu->bus->cartridge, ppu->ppuAddress.raw);
}
else if (0x2000 <= ppu->ppuAddress.raw && ppu->ppuAddress.raw < 0x3F00)
{
@ -140,7 +141,8 @@ Byte ppuRead(struct PPU* ppu, Word addr)
if (effectiveAddress >= 0x2800)
effectiveAddress -= 0x0400;
val = ppu->nameTables[0][(effectiveAddress - 0x2000) & 0x0FFF];
val = ppu->ppuReadLatch;
ppu->ppuReadLatch = ppu->nameTables[0][(effectiveAddress - 0x2000) & 0x0FFF];
}
else if (0x3F00 <= ppu->ppuAddress.raw && ppu->ppuAddress.raw < 0x4000)
{

1
NES Emulator/ppu.h
View file

@ -113,6 +113,7 @@ struct PPU
Word raw;
} ppuAddress;
Byte ppuAddressWriteTarget;
Byte ppuReadLatch;
Byte oamdma;