79 lines
2.7 KiB
C#
79 lines
2.7 KiB
C#
using BizHawk.Common;
|
|
|
|
namespace BizHawk.Emulation.Cores.PCEngine
|
|
{
|
|
public partial class PCEngine
|
|
{
|
|
byte IOBuffer;
|
|
|
|
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;
|
|
}
|
|
|
|
void WriteMemory(int addr, byte value)
|
|
{
|
|
if (addr >= 0x1F0000 && addr < 0x1F8000) // write RAM.
|
|
Ram[addr & 0x1FFF] = value;
|
|
|
|
else if (addr >= 0x1FE000) // hardware page.
|
|
{
|
|
if (addr < 0x1FE400) VDC1.WriteVDC(addr, value);
|
|
else if (addr < 0x1FE800) { Cpu.PendingCycles--; VCE.WriteVCE(addr, value); }
|
|
else if (addr < 0x1FEC00) { IOBuffer = value; PSG.WritePSG((byte)addr, value, Cpu.TotalExecutedCycles); }
|
|
else if (addr == 0x1FEC00) { IOBuffer = value; Cpu.WriteTimer(value); }
|
|
else if (addr == 0x1FEC01) { IOBuffer = value; Cpu.WriteTimerEnable(value); }
|
|
else if (addr >= 0x1FF000 &&
|
|
addr < 0x1FF400) { IOBuffer = value; WriteInput(value); }
|
|
else if (addr == 0x1FF402) { IOBuffer = value; Cpu.WriteIrqControl(value); }
|
|
else if (addr == 0x1FF403) { IOBuffer = value; Cpu.WriteIrqStatus(); }
|
|
else if (addr >= 0x1FF800) { WriteCD(addr, value); }
|
|
else Log.Error("MEM", "unhandled hardware write [{0:X6}] : {1:X2}", addr, value);
|
|
}
|
|
|
|
else if (addr >= 0x1EE000 && addr <= 0x1EE7FF) // BRAM
|
|
{
|
|
if (BramEnabled && BramLocked == false)
|
|
{
|
|
BRAM[addr & 0x7FF] = value;
|
|
SaveRamModified = true;
|
|
}
|
|
}
|
|
|
|
else
|
|
Log.Error("MEM", "UNHANDLED WRITE: {0:X6}:{1:X2}", addr, value);
|
|
|
|
CoreComm.MemoryCallbackSystem.CallWrite((uint)addr);
|
|
}
|
|
}
|
|
} |