AxibugEmuOnline/AxibugEmuOnline.Client/Assets/VirtualNes.Core/Mapper/Mapper064.cs
2024-08-05 00:44:30 +08:00

284 lines
5.3 KiB
C#

//////////////////////////////////////////////////////////////////////////
// Mapper064 Tengen Rambo-1 //
//////////////////////////////////////////////////////////////////////////
using static VirtualNes.MMU;
using static VirtualNes.Core.CPU;
using INT = System.Int32;
using BYTE = System.Byte;
using System;
using Codice.CM.Client.Differences;
namespace VirtualNes.Core
{
public class Mapper064 : Mapper
{
BYTE[] reg = new byte[3];
BYTE irq_enable;
BYTE irq_mode;
INT irq_counter;
INT irq_counter2;
BYTE irq_latch;
BYTE irq_reset;
public Mapper064(NES parent) : base(parent)
{
}
public override void Reset()
{
SetPROM_32K_Bank(PROM_8K_SIZE - 1, PROM_8K_SIZE - 1, PROM_8K_SIZE - 1, PROM_8K_SIZE - 1);
if (VROM_1K_SIZE != 0)
{
SetVROM_8K_Bank(0);
}
reg[0] = reg[1] = reg[2] = 0;
irq_enable = 0;
irq_mode = 0;
irq_counter = 0;
irq_counter2 = 0;
irq_latch = 0;
irq_reset = 0;
}
//void Mapper064::Write(WORD addr, BYTE data)
public override void Write(ushort addr, byte data)
{
//DEBUGOUT( "$%04X:$%02X\n", addr, data );
switch (addr & 0xF003)
{
case 0x8000:
reg[0] = (byte)(data & 0x0F);
reg[1] = (byte)(data & 0x40);
reg[2] = (byte)(data & 0x80);
break;
case 0x8001:
switch (reg[0])
{
case 0x00:
if (reg[2] != 0)
{
SetVROM_1K_Bank(4, data + 0);
SetVROM_1K_Bank(5, data + 1);
}
else
{
SetVROM_1K_Bank(0, data + 0);
SetVROM_1K_Bank(1, data + 1);
}
break;
case 0x01:
if (reg[2] != 0)
{
SetVROM_1K_Bank(6, data + 0);
SetVROM_1K_Bank(7, data + 1);
}
else
{
SetVROM_1K_Bank(2, data + 0);
SetVROM_1K_Bank(3, data + 1);
}
break;
case 0x02:
if (reg[2] != 0)
{
SetVROM_1K_Bank(0, data);
}
else
{
SetVROM_1K_Bank(4, data);
}
break;
case 0x03:
if (reg[2] != 0)
{
SetVROM_1K_Bank(1, data);
}
else
{
SetVROM_1K_Bank(5, data);
}
break;
case 0x04:
if (reg[2] != 0)
{
SetVROM_1K_Bank(2, data);
}
else
{
SetVROM_1K_Bank(6, data);
}
break;
case 0x05:
if (reg[2] != 0)
{
SetVROM_1K_Bank(3, data);
}
else
{
SetVROM_1K_Bank(7, data);
}
break;
case 0x06:
if (reg[1] != 0)
{
SetPROM_8K_Bank(5, data);
}
else
{
SetPROM_8K_Bank(4, data);
}
break;
case 0x07:
if (reg[1] != 0)
{
SetPROM_8K_Bank(6, data);
}
else
{
SetPROM_8K_Bank(5, data);
}
break;
case 0x08:
SetVROM_1K_Bank(1, data);
break;
case 0x09:
SetVROM_1K_Bank(3, data);
break;
case 0x0F:
if (reg[1] != 0)
{
SetPROM_8K_Bank(4, data);
}
else
{
SetPROM_8K_Bank(6, data);
}
break;
}
break;
case 0xA000:
if ((data & 0x01) != 0) SetVRAM_Mirror(VRAM_HMIRROR);
else SetVRAM_Mirror(VRAM_VMIRROR);
break;
case 0xC000:
irq_latch = data;
if (irq_reset != 0)
{
irq_counter = irq_latch;
}
break;
case 0xC001:
irq_reset = 0xFF;
irq_counter = irq_latch;
irq_mode = (byte)(data & 0x01);
break;
case 0xE000:
irq_enable = 0;
if (irq_reset != 0)
{
irq_counter = irq_latch;
}
nes.cpu.ClrIRQ(IRQ_MAPPER);
break;
case 0xE001:
irq_enable = 0xFF;
if (irq_reset != 0)
{
irq_counter = irq_latch;
}
break;
}
}
//void Mapper064::Clock(INT cycles)
public override void Clock(int cycles)
{
if (irq_mode == 0)
return;
irq_counter2 += cycles;
while (irq_counter2 >= 4)
{
irq_counter2 -= 4;
if (irq_counter >= 0)
{
irq_counter--;
if (irq_counter < 0)
{
if (irq_enable != 0)
{
nes.cpu.SetIRQ(IRQ_MAPPER);
}
}
}
}
}
//void Mapper064::HSync(INT scanline)
public override void HSync(int scanline)
{
if (irq_mode != 0)
return;
irq_reset = 0;
if ((scanline >= 0 && scanline <= 239))
{
if (nes.ppu.IsDispON())
{
if (irq_counter >= 0)
{
irq_counter--;
if (irq_counter < 0)
{
if (irq_enable != 0)
{
irq_reset = 1;
nes.cpu.SetIRQ(IRQ_MAPPER);
}
}
}
}
}
}
//void Mapper064::SaveState(LPBYTE p)
public override void SaveState(byte[] p)
{
//p[0] = reg[0];
//p[1] = reg[1];
//p[2] = reg[2];
//p[3] = irq_enable;
//p[4] = irq_mode;
//p[5] = irq_latch;
//p[6] = irq_reset;
//*((INT*)&p[8]) = irq_counter;
//*((INT*)&p[12]) = irq_counter2;
}
//void Mapper064::LoadState(LPBYTE p)
public override void LoadState(byte[] p)
{
//reg[0] = p[0];
//reg[1] = p[1];
//reg[2] = p[2];
//irq_enable = p[3];
//irq_mode = p[4];
//irq_latch = p[5];
//irq_reset = p[6];
//irq_counter = *((INT*)&p[8]);
//irq_counter2 = *((INT*)&p[12]);
}
public override bool IsStateSave()
{
return true;
}
}
}