forked from sin365/AxibugEmuOnline
316 lines
11 KiB
C#
316 lines
11 KiB
C#
//////////////////////////////////////////////////////////////
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// Mapper190 Nintendo MMC3 //
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//////////////////////////////////////////////////////////////////////////
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using static VirtualNes.Core.CPU;
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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 Mapper190 : Mapper
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{
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BYTE cbase; /* PowerOn OR RESET : cbase=0 */
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BYTE mp190_lcchk; /* PowerOn OR RESET */
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BYTE mp190_lcmd;
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BYTE mp190_cmd;
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BYTE irq_enable;
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BYTE irq_counter;
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BYTE irq_latch;
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BYTE lowoutdata;
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public Mapper190(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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SetPROM_32K_Bank(0, 1, PROM_8K_SIZE - 2, PROM_8K_SIZE - 1);
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// DWORD crc = nes.rom.GetPROM_CRC();
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// if( crc == 0x6F3D187A ) {
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// Temp_Buf=0; //Kof96
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// } else {
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// Temp_Buf=1; //ST97
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// }
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irq_enable = 0;
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irq_counter = 0;
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cbase = 0; /* PowerOn OR RESET : cbase=0 */
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mp190_lcchk = 0; /* PowerOn OR RESET */
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mp190_lcmd = 1;
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}
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//void Mapper190::WriteLow(WORD addr, BYTE data)
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public override void WriteLow(ushort addr, byte data)
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{
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/* For Initial Copy Protect check (KOF'96) */
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if (addr == 0x5000)
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{
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mp190_lcmd = data;
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switch (data)
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{
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case 0xE0:
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SetPROM_32K_Bank(0);
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break;
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case 0xEE:
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SetPROM_32K_Bank(3);
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break;
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}
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}
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if ((addr == 0x5001) && (mp190_lcmd == 0x00))
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{
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SetPROM_32K_Bank(7);
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}
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if (addr == 0x5080)
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{
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switch (data)
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{
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case 0x1: lowoutdata = 0x83; break;
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case 0x2: lowoutdata = 0x42; break;
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case 0x3: lowoutdata = 0x00; break;
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}
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}
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CPU_MEM_BANK[addr >> 13][addr & 0x1FFF] = data;
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}
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//BYTE Mapper190::ReadLow(WORD addr)
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public override byte ReadLow(ushort addr)
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{
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switch (addr)
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{
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case 0x5000:
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return lowoutdata;
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default:
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return CPU_MEM_BANK[addr >> 13][addr & 0x1FFF];
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}
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}
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//void Mapper190::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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switch (addr & 0xE003)
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{
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case 0x8000:
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mp190_cmd = data;
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if ((mp190_cmd & 0x80) != 0)
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cbase = 1;
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else
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cbase = 0;
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break;
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case 0x8003: /* for Street Fighter Zero 2 '97 */
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mp190_lcchk = data;
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switch (data)
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{
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case 0x28:
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SetPROM_8K_Bank(4, 0x1F);
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SetPROM_8K_Bank(5, 0x1F);
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SetPROM_8K_Bank(6, 0x17);
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SetPROM_8K_Bank(7, 0x1F);
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break;
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case 0x2A:
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SetPROM_8K_Bank(4, 0x1F);
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SetPROM_8K_Bank(5, 0x0F);
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SetPROM_8K_Bank(6, 0x17);
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SetPROM_8K_Bank(7, 0x1F);
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break;
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case 0x06:
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SetPROM_8K_Bank(4, 0x1E);
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SetPROM_8K_Bank(5, 0x1F);
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SetPROM_8K_Bank(6, 0x1F);
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SetPROM_8K_Bank(7, 0x1F);
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break;
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}
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break;
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case 0x8001:
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if ((mp190_lcchk == 0x6) || (mp190_lcmd == 0x0))
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{
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switch (mp190_cmd & 0x07)
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{
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case 0:
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if (cbase == 0)
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{
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SetVROM_1K_Bank(0, data + 0x100);
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SetVROM_1K_Bank(1, data + 0x101);
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}
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else
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{
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SetVROM_1K_Bank(4, data + 0x100);
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SetVROM_1K_Bank(5, data + 0x101);
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}
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break;
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case 1:
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if (cbase == 0)
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{
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SetVROM_1K_Bank(2, data + 0x100);
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SetVROM_1K_Bank(3, data + 0x101);
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}
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else
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{
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SetVROM_1K_Bank(6, data + 0x100);
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SetVROM_1K_Bank(7, data + 0x101);
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}
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break;
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case 2:
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if (cbase == 0)
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{
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SetVROM_1K_Bank(4, data);
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}
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else
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{
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SetVROM_1K_Bank(0, data);
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}
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break;
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case 3:
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if (cbase == 0)
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{
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SetVROM_1K_Bank(5, data);
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}
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else
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{
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SetVROM_1K_Bank(1, data);
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}
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break;
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case 4:
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if (cbase == 0)
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{
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SetVROM_1K_Bank(6, data);
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}
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else
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{
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SetVROM_1K_Bank(2, data);
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}
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break;
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case 5:
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if (cbase == 0)
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{
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SetVROM_1K_Bank(7, data);
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}
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else
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{
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SetVROM_1K_Bank(3, data);
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}
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break;
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case 6:
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data = (byte)(data & ((PROM_8K_SIZE * 2) - 1));
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if ((mp190_lcmd & 0x40) != 0)
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{
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SetPROM_8K_Bank(6, data);
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SetPROM_8K_Bank(4, (PROM_8K_SIZE - 1) * 2);
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}
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else
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{
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SetPROM_8K_Bank(4, data);
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SetPROM_8K_Bank(6, (PROM_8K_SIZE - 1) * 2);
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}
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break;
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case 7:
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data = (byte)(data & ((PROM_8K_SIZE * 2) - 1));
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if ((mp190_lcmd & 0x40) != 0)
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{
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SetPROM_8K_Bank(5, data);
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SetPROM_8K_Bank(4, (PROM_8K_SIZE - 1) * 2);
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}
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else
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{
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SetPROM_8K_Bank(5, data);
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SetPROM_8K_Bank(6, (PROM_8K_SIZE - 1) * 2);
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}
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break;
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}
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}
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break;
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case 0xA000:
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if ((data & 0x1) == 0x1)
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SetVRAM_Mirror(VRAM_HMIRROR);
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else
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SetVRAM_Mirror(VRAM_VMIRROR);
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break;
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case 0xA001:
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break;
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case 0xC000:
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irq_counter = (byte)(data - 1);
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break;
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case 0xC001:
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irq_latch = (byte)(data - 1);
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break;
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case 0xC002:
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irq_counter = data;
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break;
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case 0xC003:
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irq_latch = data;
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break;
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case 0xE000:
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irq_counter = irq_latch;
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irq_enable = 0;
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nes.cpu.ClrIRQ(IRQ_MAPPER);
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break;
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case 0xE001:
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irq_enable = 1;
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break;
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case 0xE002:
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irq_counter = irq_latch;
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irq_enable = 0;
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nes.cpu.ClrIRQ(IRQ_MAPPER);
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break;
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case 0xE003:
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irq_enable = 1;
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irq_counter = irq_counter;
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break;
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}
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}
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//void Mapper190::HSync(INT scanline)
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public override void HSync(int scanline)
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{
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if ((scanline >= 0 && scanline <= 239))
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{
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if (nes.ppu.IsDispON())
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{
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if (irq_enable != 0)
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{
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if ((irq_counter--) == 0)
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{
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// nes.cpu.IRQ_NotPending();
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nes.cpu.SetIRQ(IRQ_MAPPER);
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}
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}
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}
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}
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}
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//void Mapper190::SaveState(LPBYTE p)
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public override void SaveState(byte[] p)
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{
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p[0] = irq_enable;
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p[1] = irq_counter;
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p[2] = irq_latch;
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p[3] = cbase;
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p[4] = mp190_lcchk;
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p[5] = mp190_lcmd;
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p[6] = mp190_cmd;
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p[7] = lowoutdata;
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}
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//void Mapper190::LoadState(LPBYTE p)
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public override void LoadState(byte[] p)
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{
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irq_enable = p[0];
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irq_counter = p[1];
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irq_latch = p[2];
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cbase = p[3];
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mp190_lcchk = p[4];
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mp190_lcmd = p[5];
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mp190_cmd = p[6];
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lowoutdata = p[7];
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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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