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nes - SUNSOFT3 - trying something

This commit is contained in:
andres.delikat 2011-09-20 02:30:28 +00:00
parent ab23cb486c
commit ea3c6f7cca
1 changed files with 21 additions and 5 deletions
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26
BizHawk.Emulation/Consoles/Nintendo/NES/Boards/Sunsoft3.cs
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@ -7,7 +7,10 @@ namespace BizHawk.Emulation.Consoles.Nintendo
class Sunsoft3 : NES.NESBoardBase
{
int chr, prg;
int prg_bank_mask_16k;
byte prg_bank_16k;
ByteBuffer prg_banks_16k = new ByteBuffer(2);
//TODO: savestate & dispose
public override bool Configure(NES.EDetectionOrigin origin)
{
@ -19,6 +22,7 @@ namespace BizHawk.Emulation.Consoles.Nintendo
return false;
}
SetMirrorType(Cart.pad_h, Cart.pad_v);
prg_bank_mask_16k = (Cart.prg_size / 16) - 1;
return true;
}
@ -29,8 +33,18 @@ namespace BizHawk.Emulation.Consoles.Nintendo
ser.Sync("prg", ref prg);
}
void SyncPRG()
{
prg_banks_16k[0] = prg_bank_16k;
}
public override void WritePRG(int addr, byte value)
{
if (addr == 0x8000)
{
prg_bank_16k = value;
SyncPRG();
}
if (value.Bit(3))
SetMirrorType(EMirrorType.OneScreenA);
else
@ -42,10 +56,12 @@ namespace BizHawk.Emulation.Consoles.Nintendo
public override byte ReadPRG(int addr)
{
if (addr < 0x4000)
return ROM[addr + (prg * 0x4000)];
else
return base.ReadPRG(addr);
int bank_16k = addr >> 14;
int ofs = addr & ((1 << 14) - 1);
bank_16k = prg_banks_16k[bank_16k];
bank_16k &= prg_bank_mask_16k;
addr = (bank_16k << 14) | ofs;
return ROM[addr];
}
public override byte ReadPPU(int addr)