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nes: mmc5: implement NT fill mode. fixes "flying through clouds" level intro to laser invasion

This commit is contained in:
goyuken 2014-02-23 23:03:44 +00:00
parent 33fdf03af6
commit cdd19396d4
1 changed files with 15 additions and 7 deletions
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22
BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/ExROM.cs
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@ -269,15 +269,20 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
switch (nt)
{
case 0: //NES internal NTA
return base.ReadPPU(0x2000 + offset);
return NES.CIRAM[offset];
case 1: //NES internal NTB
return base.ReadPPU(0x2400 + offset);
return NES.CIRAM[0x400 | offset];
case 2: //use ExRAM as NT
//TODO - additional r/w security
if (exram_mode >= 2) return 0;
else return EXRAM[offset];
case 3: //Fill Mode
return 0xFF; //TODO
if (exram_mode >= 2)
return 0;
else
return EXRAM[offset];
case 3: // Fill Mode
if (offset >= 0x3c0)
return nt_fill_attrib;
else
return nt_fill_tile;
default: throw new Exception();
}
}
@ -389,7 +394,10 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
nt_fill_tile = value;
break;
case 0x1107: //$5107: [.... ..AA] Fill Attribute bits
nt_fill_attrib = value;
nt_fill_attrib = (byte)(value & 3);
// extend out to fill all 4 positions
nt_fill_attrib |= (byte)(nt_fill_attrib << 2);
nt_fill_attrib |= (byte)(nt_fill_attrib << 4);
break;