mirror of
https://github.com/dborth/fceugx.git
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155 lines
3.7 KiB
C++
155 lines
3.7 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) 2012 CaH4e3
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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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* FFE Copier Mappers
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*
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*/
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#include "mapinc.h"
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static uint8 preg[4], creg[8], latch, ffemode;
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static uint8 IRQa, mirr;
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static int32 IRQCount, IRQLatch;
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static uint8 *WRAM = NULL;
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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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{ &IRQa, 1, "IRQA" },
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{ &IRQCount, 4, "IRQC" },
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{ &IRQLatch, 4, "IRQL" },
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{ 0 }
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};
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static void Sync(void) {
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setprg8r(0x10, 0x6000, 0);
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if (ffemode) {
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int i;
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for (i = 0; i < 8; i++) setchr1(i << 10, creg[i]);
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setprg8(0x8000, preg[0]);
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setprg8(0xA000, preg[1]);
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setprg8(0xC000, preg[2]);
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setprg8(0xE000, preg[3]);
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} else {
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setchr8(latch & 3);
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setprg16(0x8000, (latch >> 2) & 0x3F);
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setprg16(0xc000, 0x7);
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}
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switch (mirr) {
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case 0: setmirror(MI_0); break;
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case 1: setmirror(MI_1); break;
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case 2: setmirror(MI_V); break;
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case 3: setmirror(MI_H); break;
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}
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}
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static DECLFW(FFEWriteMirr) {
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mirr = ((A << 1) & 2) | ((V >> 4) & 1);
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Sync();
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}
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static DECLFW(FFEWriteIRQ) {
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switch (A) {
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case 0x4501: IRQa = 0; X6502_IRQEnd(FCEU_IQEXT); break;
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case 0x4502: IRQCount &= 0xFF00; IRQCount |= V; X6502_IRQEnd(FCEU_IQEXT); break;
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case 0x4503: IRQCount &= 0x00FF; IRQCount |= V << 8; IRQa = 1; X6502_IRQEnd(FCEU_IQEXT); break;
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}
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}
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static DECLFW(FFEWritePrg) {
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preg[A & 3] = V;
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Sync();
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}
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static DECLFW(FFEWriteChr) {
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creg[A & 7] = V;
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Sync();
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}
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static DECLFW(FFEWriteLatch) {
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latch = V;
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Sync();
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}
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static void FFEPower(void) {
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preg[3] = ~0;
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Sync();
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SetReadHandler(0x8000, 0xFFFF, CartBR);
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SetWriteHandler(0x42FE, 0x42FF, FFEWriteMirr);
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SetWriteHandler(0x4500, 0x4503, FFEWriteIRQ);
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SetWriteHandler(0x4504, 0x4507, FFEWritePrg);
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SetWriteHandler(0x4510, 0x4517, FFEWriteChr);
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SetWriteHandler(0x4510, 0x4517, FFEWriteChr);
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SetWriteHandler(0x6000, 0x7FFF, CartBW);
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SetReadHandler(0x6000, 0x7FFF, CartBR);
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SetWriteHandler(0x8000, 0xFFFF, FFEWriteLatch);
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FCEU_CheatAddRAM(WRAMSIZE >> 10, 0x6000, WRAM);
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}
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static void FFEIRQHook(int a) {
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if (IRQa) {
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IRQCount += a;
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if (IRQCount >= 0x10000) {
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X6502_IRQBegin(FCEU_IQEXT);
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IRQa = 0;
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IRQCount = 0;
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}
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}
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}
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static void FFEClose(void)
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{
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if (WRAM)
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FCEU_gfree(WRAM);
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WRAM = NULL;
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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 Mapper6_Init(CartInfo *info) {
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ffemode = 0;
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mirr = ((info->mirror & 1) ^ 1) | 2;
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info->Power = FFEPower;
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info->Close = FFEClose;
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MapIRQHook = FFEIRQHook;
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GameStateRestore = StateRestore;
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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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if (info->battery) {
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info->SaveGame[0] = WRAM;
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info->SaveGameLen[0] = WRAMSIZE;
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}
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AddExState(&StateRegs, ~0, 0, 0);
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}
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void Mapper17_Init(CartInfo *info) {
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ffemode = 1;
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Mapper6_Init(info);
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}
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