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NES: VRC2: correct emulation details (no effect in any game)

This commit is contained in:
goyuken 2014-02-05 16:19:55 +00:00
parent 0f37d63a90
commit 20bf3b34e0
1 changed files with 6 additions and 9 deletions
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15
BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/VRC2_4.cs
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@ -225,10 +225,9 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
case "351948": // vrc2c A1 A0
// this is a weird PCB
// it's the only vrc2 with wram, and the only one with 256 prg rom
// it also has extra chips that no other vrc2\4 has
// it crashes unless you set type = 4; i didn't bother figuring out why
// it also has extra chips that no other vrc2\4 has (probably because
// the VRC2 doesn't support WRAM internally)
remap = AddrA1A0;
type = 4;
break;
default:
throw new Exception(string.Format("Unknown PCB type for VRC2: \"{0}\"", Cart.pcb));
@ -241,12 +240,10 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
prg_bank_mask_8k = Cart.prg_size / 8 - 1;
chr_bank_mask_1k = Cart.chr_size - 1;
if (type == 4) prg_reg_mask_8k = 0x1F;
else prg_reg_mask_8k = 0xF;
//this VRC2 variant has an extra large PRG reg
if (Cart.board_type == "MAPPER116_HACKY")
prg_reg_mask_8k = 0x1F;
// prg regs are 5 bits wide in all VRC2 and VRC4, believe it or not
// todo: we don't even need this, do we? removing it would
// support those 'oversizes' that nesdev gets boners for
prg_reg_mask_8k = 0x1F;
prg_bank_reg_8k[0] = 0;
prg_bank_reg_8k[1] = 1;