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nes-do mapper088 differently

This commit is contained in:
zeromus 2012-07-15 22:30:25 +00:00
parent a33859fc1e
commit 3ae3a52f7a
1 changed files with 10 additions and 9 deletions
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19
BizHawk.Emulation/Consoles/Nintendo/NES/Boards/Namcot1xx/Mapper088.cs
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@ -14,16 +14,15 @@ namespace BizHawk.Emulation.Consoles.Nintendo
This is the same as Mapper206, with the following exception:
CHR support is increased to 128KB by connecting PPU's A12 line to the CHR ROM's A16 line.
For example, masking the CHR ROM address output from the mapper by $FFFF, and then OR it with $10000 if the PPU address was >= $1000.
For example, mask the CHR ROM 1K bank output from the mapper by $3F, and then OR it with $40 if the PPU address was >= $1000.
Consequently, CHR is split into two halves. $0xxx can only have CHR from the first 64K, $1xxx can only have CHR from the second 64K.
*/
class Mapper088 : Namcot108Board_Base
{
//configuration
int chr_byte_mask;
int chr_bank_mask_1k;
public override bool Configure(NES.EDetectionOrigin origin)
{
@ -41,19 +40,21 @@ namespace BizHawk.Emulation.Consoles.Nintendo
BaseSetup();
SetMirrorType(EMirrorType.Vertical);
chr_byte_mask = (Cart.chr_size*1024) - 1;
chr_bank_mask_1k = Cart.chr_size - 1;
return true;
}
int RewireCHR(int addr)
{
int chrrom_addr = base.MapCHR(addr);
chrrom_addr &= 0xFFFF;
int bank_1k = mapper.Get_CHRBank_1K(addr);
bank_1k &= 0x3F;
if (addr >= 0x1000)
chrrom_addr |= 0x10000;
chrrom_addr &= chr_byte_mask;
return chrrom_addr;
bank_1k |= 0x40;
bank_1k &= chr_bank_mask_1k;
int ofs = addr & ((1 << 10) - 1);
addr = (bank_1k << 10) + ofs;
return addr;
}
public override byte ReadPPU(int addr)