forked from sin365/AxibugEmuOnline
103 lines
2.7 KiB
C#
103 lines
2.7 KiB
C#
//////////////////////////////////////////////////////////////////////////
|
|
// Mapper042 Mario Baby //
|
|
//////////////////////////////////////////////////////////////////////////
|
|
using static VirtualNes.Core.CPU;
|
|
using static VirtualNes.MMU;
|
|
using BYTE = System.Byte;
|
|
|
|
|
|
namespace VirtualNes.Core
|
|
{
|
|
public class Mapper042 : Mapper
|
|
{
|
|
BYTE irq_enable;
|
|
BYTE irq_counter;
|
|
public Mapper042(NES parent) : base(parent)
|
|
{
|
|
}
|
|
|
|
|
|
public override void Reset()
|
|
{
|
|
irq_enable = 0;
|
|
irq_counter = 0;
|
|
|
|
SetPROM_8K_Bank(3, 0);
|
|
SetPROM_32K_Bank(PROM_8K_SIZE - 4, PROM_8K_SIZE - 3, PROM_8K_SIZE - 2, PROM_8K_SIZE - 1);
|
|
|
|
if (VROM_1K_SIZE != 0)
|
|
{
|
|
SetVROM_8K_Bank(0);
|
|
}
|
|
}
|
|
|
|
//void Mapper042::Write(WORD addr, BYTE data)
|
|
public override void Write(ushort addr, byte data)
|
|
{
|
|
switch (addr & 0xE003)
|
|
{
|
|
case 0xE000:
|
|
SetPROM_8K_Bank(3, data & 0x0F);
|
|
break;
|
|
|
|
case 0xE001:
|
|
if ((data & 0x08) != 0) SetVRAM_Mirror(VRAM_HMIRROR);
|
|
else SetVRAM_Mirror(VRAM_VMIRROR);
|
|
break;
|
|
|
|
case 0xE002:
|
|
if ((data & 0x02) != 0)
|
|
{
|
|
irq_enable = 0xFF;
|
|
}
|
|
else
|
|
{
|
|
irq_enable = 0;
|
|
irq_counter = 0;
|
|
}
|
|
nes.cpu.ClrIRQ(IRQ_MAPPER);
|
|
break;
|
|
}
|
|
}
|
|
|
|
//void Mapper042::HSync(INT scanline)
|
|
public override void HSync(int scanline)
|
|
{
|
|
nes.cpu.ClrIRQ(IRQ_MAPPER);
|
|
if (irq_enable != 0)
|
|
{
|
|
if (irq_counter < 215)
|
|
{
|
|
irq_counter++;
|
|
}
|
|
if (irq_counter == 215)
|
|
{
|
|
irq_enable = 0;
|
|
// nes.cpu.IRQ();
|
|
nes.cpu.SetIRQ(IRQ_MAPPER);
|
|
}
|
|
}
|
|
}
|
|
|
|
//void Mapper042::SaveState(LPBYTE p)
|
|
public override void SaveState(byte[] p)
|
|
{
|
|
p[0] = irq_enable;
|
|
p[1] = irq_counter;
|
|
}
|
|
|
|
//void Mapper042::LoadState(LPBYTE p)
|
|
public override void LoadState(byte[] p)
|
|
{
|
|
irq_enable = p[0];
|
|
irq_counter = p[1];
|
|
}
|
|
|
|
|
|
public override bool IsStateSave()
|
|
{
|
|
return true;
|
|
}
|
|
}
|
|
}
|