mirror of
https://github.com/dborth/fceugx.git
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108 lines
2.5 KiB
C++
108 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) 2007 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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* FDS Conversion
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*
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*/
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#include "mapinc.h"
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static uint8 reg, IRQa;
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static int32 IRQCount;
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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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{ ®, 1, "REG" },
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{ &IRQa, 1, "IRQA" },
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{ &IRQCount, 4, "IRQC" },
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{ 0 }
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};
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static void Sync(void) {
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setchr8(0);
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setprg8(0x6000, reg);
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setprg8(0x8000, 0xc);
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setprg4(0xa000, (0xd << 1));
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setprg2(0xb000, (0xd << 2) + 2);
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setprg2r(0x10, 0xb800, 4);
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setprg2r(0x10, 0xc000, 5);
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setprg2r(0x10, 0xc800, 6);
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setprg2r(0x10, 0xd000, 7);
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setprg2(0xd800, (0xe << 2) + 3);
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setprg8(0xe000, 0xf);
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}
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static DECLFW(LH53RamWrite) {
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WRAM[(A - 0xB800) & 0x1FFF] = V;
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}
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static DECLFW(LH53Write) {
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reg = V;
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Sync();
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}
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static DECLFW(LH53IRQaWrite) {
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IRQa = V & 2;
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IRQCount = 0;
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if (!IRQa)
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X6502_IRQEnd(FCEU_IQEXT);
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}
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static void LH53IRQ(int a) {
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if (IRQa) {
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IRQCount += a;
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if (IRQCount > 7560)
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X6502_IRQBegin(FCEU_IQEXT);
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}
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}
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static void LH53Power(void) {
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Sync();
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SetReadHandler(0x6000, 0xFFFF, CartBR);
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SetWriteHandler(0xB800, 0xD7FF, LH53RamWrite);
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SetWriteHandler(0xE000, 0xEFFF, LH53IRQaWrite);
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SetWriteHandler(0xF000, 0xFFFF, LH53Write);
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}
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static void LH53Close(void) {
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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 LH53_Init(CartInfo *info) {
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info->Power = LH53Power;
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info->Close = LH53Close;
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MapIRQHook = LH53IRQ;
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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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AddExState(&StateRegs, ~0, 0, 0);
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}
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