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BizHawk/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/Mapper243.cs

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Move Buffer.cs and Util.cs from BizHawk.Emulation to BizHawk.Common, and add 1234832983 usings
2013-11-04 00:36:15 +00:00
using BizHawk.Common;
clean up NES namespace
2013-11-14 13:15:41 +00:00
namespace BizHawk.Emulation.Cores.Nintendo.NES
Start Mapper 243
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{
NES - make mappers and whatnot sealed classes, since it may theoretically be a tiny speedup, and if nothing else, it is more conceptually correct
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public sealed class Mapper243 : NES.NESBoardBase
Start Mapper 243
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{
Mapper 243 - link to wiki instead of putting outdated docs in the wiki
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// http://wiki.nesdev.com/w/index.php/INES_Mapper_243
Start Mapper 243
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int reg_addr;
ByteBuffer regs = new ByteBuffer(8);
Implement mapper 243
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int chr_bank_mask_8k, prg_bank_mask_32k;
Start Mapper 243
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public override bool Configure(NES.EDetectionOrigin origin)
{
switch (Cart.board_type)
{
case "MAPPER243":
Mapper 243 - remove reference to unif having problems as the documentation bug was probably what was being observed
2015-08-10 00:04:27 +00:00
case "UNIF_UNL-Sachen-74LS374N":
Start Mapper 243
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break;
default:
return false;
}
Implement mapper 243
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chr_bank_mask_8k = Cart.chr_size / 8 - 1;
prg_bank_mask_32k = Cart.prg_size / 32 - 1;
Start Mapper 243
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return true;
}
public override void SyncState(Serializer ser)
{
ser.Sync("reg_addr", ref reg_addr);
ser.Sync("regs", ref regs);
base.SyncState(ser);
}
public override void WriteEXP(int addr, byte value)
{
Implement mapper 243
2012-07-21 19:23:05 +00:00
switch (addr & 0x01)
Start Mapper 243
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{
case 0x0000:
Implement mapper 243
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reg_addr = value & 0x07;
Start Mapper 243
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break;
case 0x0001:
switch (reg_addr)
{
case 2:
Implement mapper 243
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regs[2] = (byte)(value & 0x01);
Start Mapper 243
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break;
case 4:
Implement mapper 243
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regs[4] = (byte)(value & 0x01);
Start Mapper 243
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break;
case 5:
Implement mapper 243
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regs[5] = (byte)(value & 0x07);
Start Mapper 243
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break;
case 6:
Implement mapper 243
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regs[6] = (byte)(value & 0x03);
Start Mapper 243
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break;
case 7:
Implement mapper 243
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int mirror = (value >> 1) & 0x03;
switch (mirror)
{
case 0:
SetMirrorType(EMirrorType.Horizontal);
break;
case 1:
SetMirrorType(EMirrorType.Vertical);
break;
case 2:
SetMirroring(0, 1, 1, 1);
break;
case 3:
SetMirrorType(EMirrorType.OneScreenB);
break;
}
Start Mapper 243
2012-07-21 18:54:12 +00:00
break;
}
break;
}
}
public override byte ReadPPU(int addr)
{
if (addr < 0x2000)
{
Nes - fix mapper 243 chr handling, we were correctly doing what was documented in the disch docs, but Nintendulator and FCEUX did something slightly different that is working. Changed to do against the docs and do what working emulators do
2015-08-09 23:42:47 +00:00
int chr_bank = regs[4] << 2 | (regs[6]) | (regs[2] << 3);
Implement mapper 243
2012-07-21 19:23:05 +00:00
return VROM[((chr_bank & chr_bank_mask_8k) * 0x2000) + addr];
Start Mapper 243
2012-07-21 18:54:12 +00:00
}
else
{
return base.ReadPPU(addr);
}
}
public override byte ReadPRG(int addr)
{
Implement mapper 243
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return ROM[((regs[5] & prg_bank_mask_32k) * 0x8000) + addr];
Start Mapper 243
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}
}
}