AxibugEmuOnline/AxibugEmuOnline.Client/Assets/VirtualNes.Core/Mapper/Mapper175.cs

69 lines
1.8 KiB
C#

//////////////////////////////////////////////////////////////////////////
// Mapper175 15-in-1 (Kaiser) //
//////////////////////////////////////////////////////////////////////////
using static VirtualNes.MMU;
using BYTE = System.Byte;
namespace VirtualNes.Core
{
public class Mapper175 : Mapper
{
BYTE reg_dat;
public Mapper175(NES parent) : base(parent)
{
}
public override void Reset()
{
SetPROM_16K_Bank(4, 0);
SetPROM_16K_Bank(6, 0);
reg_dat = 0;
if (VROM_1K_SIZE != 0)
{
SetVROM_8K_Bank(0);
}
}
//BYTE Mapper175::Read(WORD addr)
public override void Read(ushort addr, byte data)
{
if (addr == 0xFFFC)
{
SetPROM_16K_Bank(4, reg_dat & 0x0F);
SetPROM_8K_Bank(6, (reg_dat & 0x0F) * 2);
}
}
//void Mapper175::Write(WORD addr, BYTE data)
public override void Write(ushort addr, byte data)
{
switch (addr)
{
case 0x8000:
if ((data & 0x04) != 0)
{
SetVRAM_Mirror(VRAM_HMIRROR);
}
else
{
SetVRAM_Mirror(VRAM_VMIRROR);
}
break;
case 0xA000:
reg_dat = data;
SetPROM_8K_Bank(7, (reg_dat & 0x0F) * 2 + 1);
SetVROM_8K_Bank(reg_dat & 0x0F);
break;
}
}
public override bool IsStateSave()
{
return true;
}
}
}