// The SuperGrafx has 32K of RAM and a different port configuration to allow
// I/O access to VDC1, VDC2, and the VPC.
byte ReadMemorySGX(int addr)
{
if (addr < 0xFFFFF) // read ROM
return RomData[addr % RomLength];
if (addr >= 0x1F0000 && addr < 0x1F8000) // read RAM
return Ram[addr & 0x7FFF];
if (addr >= 0x1FE000) // hardware page.
{
if (addr < 0x1FE400)
{
addr &= 0x1F;
if (addr <= 0x07) return VDC1.ReadVDC(addr);
if (addr <= 0x0F) return VPC.ReadVPC(addr);
if (addr <= 0x17) return VDC2.ReadVDC(addr);
return 0xFF;
}
if (addr < 0x1FE800) { Cpu.PendingCycles--; return VCE.ReadVCE(addr); }
if (addr < 0x1FEC00) return IOBuffer;
if (addr < 0x1FF000) { IOBuffer = (byte)(Cpu.ReadTimerValue() | (IOBuffer & 0x80)); return IOBuffer; }
if (addr >= 0x1FF000 &&
addr < 0x1FF400) { IOBuffer = ReadInput(); return IOBuffer; }
if ((addr & ~1) == 0x1FF400) return IOBuffer;
if (addr == 0x1FF402) { IOBuffer = Cpu.IRQControlByte; return IOBuffer; }
if (addr == 0x1FF403) { IOBuffer = (byte)(Cpu.ReadIrqStatus() | (IOBuffer & 0xF8)); return IOBuffer; }
}
Log.Error("MEM", "UNHANDLED READ: {0:X6}", addr);
return 0xFF;
}
private byte ReadMemoryPopulous(int addr)
{
if (addr >= 0x80000 && addr < 0x88000)
{
return(PopulousRAM[addr & 0x7FFF]);
}
if (addr < 0xFFFFF) // read ROM
{
return(RomData[addr % RomLength]);
}
if (addr >= 0x1F0000 && addr < 0x1F8000) // read RAM
{
return(Ram[addr & 0x1FFF]);
}
if (addr >= 0x1FE000) // hardware page.
{
if (addr < 0x1FE400)
{
return(VDC1.ReadVDC(addr));
}
if (addr < 0x1FE800)
{
Cpu.PendingCycles--; return(VCE.ReadVCE(addr));
}
if (addr < 0x1FEC00)
{
return(IOBuffer);
}
if (addr < 0x1FF000)
{
IOBuffer = (byte)(Cpu.ReadTimerValue() | (IOBuffer & 0x80)); return(IOBuffer);
}
if (addr >= 0x1FF000 &&
addr < 0x1FF400)
{
IOBuffer = ReadInput(); return(IOBuffer);
}
if ((addr & ~1) == 0x1FF400)
{
return(IOBuffer);
}
if (addr == 0x1FF402)
{
IOBuffer = Cpu.IRQControlByte; return(IOBuffer);
}
if (addr == 0x1FF403)
{
IOBuffer = (byte)(Cpu.ReadIrqStatus() | (IOBuffer & 0xF8)); return(IOBuffer);
}
}
Log.Error("MEM", "UNHANDLED READ: {0:X6}", addr);
return(0xFF);
}
byte ReadMemory(int addr)
{
if (addr < 0xFFFFF) // read ROM
{
return(RomData[addr % RomLength]);
}
if (addr >= 0x1F0000 && addr < 0x1F8000) // read RAM
{
return(Ram[addr & 0x1FFF]);
}
if (addr >= 0x1FE000) // hardware page.
{
if (addr < 0x1FE400)
{
return(VDC1.ReadVDC(addr));
}
if (addr < 0x1FE800)
{
Cpu.PendingCycles--; return(VCE.ReadVCE(addr));
}
if (addr < 0x1FEC00)
{
return(IOBuffer);
}
if (addr < 0x1FF000)
{
IOBuffer = (byte)(Cpu.ReadTimerValue() | (IOBuffer & 0x80)); return(IOBuffer);
}
if (addr >= 0x1FF000 &&
addr < 0x1FF400)
{
IOBuffer = ReadInput(); return(IOBuffer);
}
if ((addr & ~1) == 0x1FF400)
{
return(IOBuffer);
}
if (addr == 0x1FF402)
{
IOBuffer = Cpu.IRQControlByte; return(IOBuffer);
}
if (addr == 0x1FF403)
{
IOBuffer = (byte)(Cpu.ReadIrqStatus() | (IOBuffer & 0xF8)); return(IOBuffer);
}
if (addr >= 0x1FF800)
{
return(ReadCD(addr));
}
}
if (addr >= 0x1EE000 && addr <= 0x1EE7FF) // BRAM
{
if (BramEnabled && BramLocked == false)
{
return(BRAM[addr & 0x7FF]);
}
return(0xFF);
}
//CoreComm.MemoryCallbackSystem.CallRead((uint)addr);
Log.Error("MEM", "UNHANDLED READ: {0:X6}", addr);
return(0xFF);
}
byte ReadMemoryCD(int addr)
{
if (addr < 0x80000) // read ROM
{
return(RomData[addr % RomLength]);
}
if (addr >= 0x1F0000 && addr < 0x1F8000) // read RAM
{
return(Ram[addr & 0x1FFF]);
}
if (addr >= 0x100000 && addr < 0x110000) // read CD RAM
{
return(CDRam[addr & 0xFFFF]);
}
if (addr >= 0xD0000 && addr < 0x100000 && SuperRam != null) // Super SysCard RAM
{
return(SuperRam[addr - 0xD0000]);
}
if (addr >= 0x1FE000) // hardware page.
{
if (addr < 0x1FE400)
{
return(VDC1.ReadVDC(addr));
}
if (addr < 0x1FE800)
{
Cpu.PendingCycles--; return(VCE.ReadVCE(addr));
}
if (addr < 0x1FEC00)
{
return(IOBuffer);
}
if (addr < 0x1FF000)
{
IOBuffer = (byte)(Cpu.ReadTimerValue() | (IOBuffer & 0x80)); return(IOBuffer);
}
if (addr >= 0x1FF000 &&
addr < 0x1FF400)
{
IOBuffer = ReadInput(); return(IOBuffer);
}
if ((addr & ~1) == 0x1FF400)
{
return(IOBuffer);
}
if (addr == 0x1FF402)
{
IOBuffer = Cpu.IRQControlByte; return(IOBuffer);
}
if (addr == 0x1FF403)
{
IOBuffer = (byte)(Cpu.ReadIrqStatus() | (IOBuffer & 0xF8)); return(IOBuffer);
}
if (addr >= 0x1FF800)
{
return(ReadCD(addr));
}
}
if (addr >= 0x80000 && addr < 0x88000 && ArcadeCard)
{
var page = ArcadePage[(addr >> 13) & 3];
byte value = ArcadeRam[page.EffectiveAddress];
page.Increment();
return(value);
}
if (addr >= 0x1EE000 && addr <= 0x1EE7FF) // BRAM
{
if (BramEnabled && BramLocked == false)
{
return(BRAM[addr & 0x7FF]);
}
return(0xFF);
}
Log.Error("MEM", "UNHANDLED READ: {0:X6}", addr);
return(0xFF);
}
