135 lines
3.4 KiB
C#
135 lines
3.4 KiB
C#
//////////////////////////////////////////////////////////////////////////
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// Mapper004 Supor Computer V4.0 //
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//////////////////////////////////////////////////////////////////////////
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using static VirtualNes.MMU;
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using BYTE = System.Byte;
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namespace VirtualNes.Core
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{
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public class Mapper167 : Mapper
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{
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BYTE[] regs = new byte[4];
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BYTE rom_type;
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public Mapper167(NES parent) : base(parent)
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{
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}
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public override void Reset()
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{
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uint crc;
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regs[0] = 0;
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regs[1] = 0;
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regs[2] = 0;
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regs[3] = 0;
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crc = nes.rom.GetPROM_CRC();
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if (crc == 0x82F1Fb96)
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{
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// Subor Computer(Russia)
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rom_type = 1;
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}
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else
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{
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// Subor Computer(Chinese)
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rom_type = 0;
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}
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SetBank_CPU();
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SetBank_PPU();
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}
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//void Mapper167::Write(WORD addr, BYTE data)
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public override void Write(ushort addr, byte data)
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{
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int idx;
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idx = (addr >> 13) & 0x03;
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regs[idx] = data;
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SetBank_CPU();
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SetBank_PPU();
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// DEBUGOUT("write to %04x:%02x\n", addr, data);
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}
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void SetBank_CPU()
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{
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int @base, bank;
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@base = ((regs[0] ^ regs[1]) & 0x10) << 1;
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bank = (regs[2] ^ regs[3]) & 0x1f;
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if ((regs[1] & 0x08) != 0)
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{
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bank &= 0xfe;
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if (rom_type == 0)
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{
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SetPROM_16K_Bank(4, @base + bank + 1);
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SetPROM_16K_Bank(6, @base + bank + 0);
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}
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else
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{
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SetPROM_16K_Bank(6, @base + bank + 1);
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SetPROM_16K_Bank(4, @base + bank + 0);
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}
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// DEBUGOUT("32K MODE!\n");
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}
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else
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{
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if ((regs[1] & 0x04) != 0)
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{
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SetPROM_16K_Bank(4, 0x1f);
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SetPROM_16K_Bank(6, @base + bank);
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// DEBUGOUT("HIGH 16K MODE!\n");
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}
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else
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{
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SetPROM_16K_Bank(4, @base + bank);
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if (rom_type == 0)
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{
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SetPROM_16K_Bank(6, 0x20);
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}
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else
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{
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SetPROM_16K_Bank(6, 0x07);
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}
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// DEBUGOUT("LOW 16K MODE!\n");
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}
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}
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}
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void SetBank_PPU()
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{
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SetCRAM_8K_Bank(0);
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}
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//void Mapper167::SaveState(LPBYTE p)
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public override void SaveState(byte[] p)
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{
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p[0] = regs[0];
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p[1] = regs[1];
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p[2] = regs[2];
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p[3] = regs[3];
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p[4] = rom_type;
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}
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//void Mapper167::LoadState(LPBYTE p)
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public override void LoadState(byte[] p)
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{
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regs[0] = p[0];
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regs[1] = p[1];
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regs[2] = p[2];
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regs[3] = p[3];
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rom_type = p[4];
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}
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public override bool IsStateSave()
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{
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return true;
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}
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}
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}
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