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neshawk - relax restriction on vrc1 PRG registers, so they can be larger than the original vrc1 chip allows (for rom-expanding hacks)

This commit is contained in:
zeromus 2022-03-06 01:35:23 -05:00
parent a5fb4caad0
commit fcce7b64d6
1 changed files with 6 additions and 3 deletions
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9
src/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/VRC1.cs
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@ -153,9 +153,12 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
{
switch (addr)
{
case 0x0000: prg_banks_8k[0] = (value & 0xF) & prg_bank_mask_8k; break;
case 0x2000: prg_banks_8k[1] = (value & 0xF) & prg_bank_mask_8k; break;
case 0x4000: prg_banks_8k[2] = (value & 0xF) & prg_bank_mask_8k; break;
//0x0F mask on value was removed
//technically its out of specs, but some hacks will be adding banks
//however, if the game has normal hardware, it has a normal (16 and less) number of prg banks, and the prg_bank_mask_8k will take care of it
case 0x0000: prg_banks_8k[0] = value & prg_bank_mask_8k; break;
case 0x2000: prg_banks_8k[1] = value & prg_bank_mask_8k; break;
case 0x4000: prg_banks_8k[2] = value & prg_bank_mask_8k; break;
case 0x1000: //[.... .BAM] Mirroring, CHR reg high bits
if(value.Bit(0))