128 lines
3.6 KiB
C
128 lines
3.6 KiB
C
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/* FCEUmm - NES/Famicom Emulator
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*
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* Copyright notice for this file:
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* Copyright (C) 2023
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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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/* NES 2.0 Mapper 528
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* UNIF BMC-831128C
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*/
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#include "mapinc.h"
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#include "vrcirq.h"
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static uint8 preg[4], creg[8], mirr;
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static uint8 gamesel;
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static uint8 *WRAM;
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static uint32 WRAMSIZE;
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static SFORMAT StateRegs[] =
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{
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{ preg, 4, "PREG" },
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{ creg, 8, "CREG" },
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{ &mirr, 1, "MIRR" },
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{ &gamesel, 1, "GSEL" },
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{ 0 }
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};
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static void Sync(void) {
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uint8 mask = (gamesel << 4) | 0x0F;
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if (preg[3] == 1) {
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setprg8r(0x10, 0x6000, 0);
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} else {
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setprg8(0x6000, (preg[3] & mask) + gamesel);
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}
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setprg8(0x8000, (preg[0] & mask) + (gamesel << 4));
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setprg8(0xA000, (preg[1] & mask) + (gamesel << 4));
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setprg8(0xC000, ( ~1 & mask) + (gamesel << 4));
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setprg8(0xE000, ( ~0 & mask) + (gamesel << 4));
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setchr1(0x0000, creg[0] + (gamesel << 8));
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setchr1(0x0400, creg[1] + (gamesel << 8));
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setchr1(0x0800, creg[2] + (gamesel << 8));
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setchr1(0x0C00, creg[3] + (gamesel << 8));
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setchr1(0x1000, creg[4] + (gamesel << 8));
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setchr1(0x1400, creg[5] + (gamesel << 8));
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setchr1(0x1800, creg[6] + (gamesel << 8));
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setchr1(0x1C00, creg[7] + (gamesel << 8));
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switch (mirr & 3) {
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case 0: setmirror(MI_V); break;
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case 1: setmirror(MI_H); break;
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case 2: setmirror(MI_0); break;
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case 3: setmirror(MI_1); break;
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}
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}
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static DECLFW(M528Write1) {
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switch (A & 0x0F) {
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case 0x0: creg[0] = V; break;
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case 0x1: creg[1] = V; break;
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case 0x2: creg[2] = V; break;
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case 0x3: creg[3] = V; break;
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case 0x4: creg[4] = V; break;
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case 0x5: creg[5] = V; break;
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case 0x6: creg[6] = V; break;
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case 0x7: creg[7] = V; break;
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case 0x8: preg[3] = V; break;
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case 0x9: preg[0] = V; break;
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case 0xA: preg[1] = V; break;
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case 0xB: break;
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case 0xC: mirr = V & 3; break;
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case 0xD: VRCIRQ_Control(V); break;
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case 0xE: VRCIRQ_Acknowledge(); break;
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case 0xF: VRCIRQ_Latch(V); break;
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}
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gamesel = (A & 0x4000) >> 14;
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Sync();
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}
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static void M528Power(void) {
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int i;
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gamesel = 0;
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preg[0] = 0;
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preg[1] = 1;
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preg[2] = 0;
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preg[3] = 0;
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for (i = 0; i < 8; i++) {
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creg[i] = i;
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}
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Sync();
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SetReadHandler(0x8000, 0xFFFF, CartBR);
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SetWriteHandler(0xA000, 0xAFFF, M528Write1);
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SetWriteHandler(0xC000, 0xCFFF, M528Write1);
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SetReadHandler(0x6000, 0x7FFF, CartBR);
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SetWriteHandler(0x6000, 0x7FFF, CartBW);
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FCEU_CheatAddRAM(WRAMSIZE >> 10, 0x6000, WRAM);
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}
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static void StateRestore(int version) {
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Sync();
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}
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void Mapper528_Init(CartInfo *info) {
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info->Power = M528Power;
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GameStateRestore = StateRestore;
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VRCIRQ_Init();
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AddExState(&StateRegs, ~0, 0, 0);
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WRAMSIZE = 8192;
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WRAM = (uint8*) FCEU_gmalloc(WRAMSIZE);
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SetupCartPRGMapping(0x10, WRAM, WRAMSIZE, 1);
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AddExState(WRAM, WRAMSIZE, 0, "WRAM");
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}
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