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Fixed Famicom Yarou Vol 1

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This commit is contained in:
Souryo 2017-04-12 22:41:00 -04:00
parent bfa68554b0
commit 1aa223275b
1 changed files with 18 additions and 2 deletions
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20
Core/MMC3_45.h
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@ -12,6 +12,20 @@ protected:
virtual uint16_t RegisterStartAddress() override { return 0x8000; }
virtual uint16_t RegisterEndAddress() override { return 0xFFFF; }
virtual void InitMapper() override
{
MMC3::InitMapper();
//Needed by Famicom Yarou Vol 1 - Game apparently writes to CHR RAM before initializing the registers
_registers[0] = 0;
_registers[1] = 2;
_registers[2] = 4;
_registers[3] = 5;
_registers[4] = 6;
_registers[5] = 7;
UpdateChrMapping();
}
virtual void StreamState(bool saving) override
{
MMC3::StreamState(saving);
@ -34,8 +48,10 @@ protected:
virtual void SelectCHRPage(uint16_t slot, uint16_t page, ChrMemoryType memoryType = ChrMemoryType::Default) override
{
page &= 0xFF >> (0x0F - (_reg[2] & 0x0F));
page |= _reg[0] | ((_reg[2] & 0xF0) << 4);
if(!HasChrRam()) {
page &= 0xFF >> (0x0F - (_reg[2] & 0x0F));
page |= _reg[0] | ((_reg[2] & 0xF0) << 4);
}
MMC3::SelectCHRPage(slot, page, memoryType);
}