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SxROM: fix "Bill & Ted's Excellent Video Game Adventure.nes" 

breaks all MMC1 savestates
This commit is contained in:
goyuken 2012-09-30 01:32:10 +00:00
parent 96b282ca96
commit bb995c1472
1 changed files with 17 additions and 2 deletions
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19
BizHawk.Emulation/Consoles/Nintendo/NES/Boards/SxROM.cs
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@ -206,14 +206,27 @@ namespace BizHawk.Emulation.Consoles.Nintendo
//configuration
protected int prg_mask, chr_mask;
protected int vram_mask;
const int pputimeout = 4; // i don't know if this is right, but anything lower will not boot Bill & Ted
//state
public MMC1 mmc1;
/// <summary>number of cycles since last WritePRG()</summary>
uint ppuclock;
public override void ClockPPU()
{
ppuclock++;
}
public override void WritePRG(int addr, byte value)
{
mmc1.Write(addr, value);
SetMirrorType(mmc1.mirror); //often redundant, but gets the job done
// mmc1 ignores subsequent writes that are very close together
if (ppuclock >= pputimeout)
{
ppuclock = 0;
mmc1.Write(addr, value);
SetMirrorType(mmc1.mirror); //often redundant, but gets the job done
}
}
public override byte ReadPRG(int addr)
@ -255,6 +268,7 @@ namespace BizHawk.Emulation.Consoles.Nintendo
{
base.SyncState(ser);
mmc1.SyncState(ser);
ser.Sync("ppuclock", ref ppuclock);
}
public override bool Configure(NES.EDetectionOrigin origin)
@ -342,6 +356,7 @@ namespace BizHawk.Emulation.Consoles.Nintendo
vram_mask = (Cart.vram_size*1024) - 1;
chr_mask = (Cart.chr_size / 8 * 2) - 1;
SetMirrorType(mmc1.mirror);
ppuclock = pputimeout;
}
} //class SxROM