98 lines
2.5 KiB
C
98 lines
2.5 KiB
C
/* FCE Ultra - NES/Famicom Emulator
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*
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* Copyright notice for this file:
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* Copyright (C) 2025 NewRisingSun
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "mapinc.h"
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#include "asic_vrc2and4.h"
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#include "cartram.h"
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static uint8 nt[4];
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static uint8 prg;
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static uint8 mask;
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static uint8 compare;
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extern uint32 RefreshAddr;
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static writefunc writePPU;
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static SFORMAT stateRegs[] ={
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{ nt, 4, "EXPN" },
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{ &prg, 1, "PRGC" },
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{ &mask, 1, "CHRM" },
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{ &compare, 1, "CHRC" },
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{ 0 }
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};
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static void sync () {
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int bank;
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VRC24_syncWRAM(0);
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VRC24_syncPRG(0x01F, 0x000);
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for (bank =0; bank <8; bank++) setchr1r((VRC24_getCHRBank(bank) &mask) ==compare? 0x10: 0x00, bank <<10, VRC24_getCHRBank(bank));
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setmirrorw(nt[0] &1, nt[1] &1, nt[2] &1, nt[3] &1);
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}
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static const uint8 compares[8] = { 0x28, 0x00, 0x4C, 0x64, 0x46, 0x7C, 0x04, 0xFF };
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static DECLFW (interceptPPUWrite) {
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if (~RefreshAddr &0x2000) {
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int bank =VRC24_getCHRBank(RefreshAddr >>10 &7);
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if (bank &0x80) {
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if (bank &0x10) {
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mask =0x00;
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compare =0xFF;
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} else {
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int index =(bank &0x02? 1: 0) | (bank &0x08? 2: 0) | (bank &0x40? 4: 0);
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mask =bank &0x40? 0xFE: 0xFC;
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compare =compares[index];
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}
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sync();
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}
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}
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writePPU(A, V);
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}
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static int getPRGBank (uint8 bank) {
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return bank ==2? prg: VRC24_getPRGBank(bank);
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}
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static DECLFW (externalSelect) {
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if (A &4)
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nt[A &3] =V;
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else
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prg =V;
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sync();
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}
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static void power (void) {
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mask =0xFC;
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compare =0x28;
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nt[0] =nt[1] =0xE0;
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nt[2] =nt[3] =0xE1;
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prg =0xFE;
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VRC24_power();
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writePPU =GetWriteHandler(0x2007);
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SetWriteHandler(0x2007, 0x2007, interceptPPUWrite);
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}
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void Mapper544_Init (CartInfo *info) {
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VRC4_init(info, sync, 0x400, 0x800, 1, getPRGBank, NULL, NULL, NULL, externalSelect);
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CartRAM_init(info, 8, 2);
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info->Power =power;
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AddExState(stateRegs, ~0, 0, 0);
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}
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