mirror of
https://github.com/dborth/fceugx.git
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89 lines
2.6 KiB
C++
89 lines
2.6 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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#include "mapinc.h"
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static uint8 reg[8], cmd, IRQa = 0, isirqused = 0;
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static int32 IRQCount;
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static SFORMAT StateRegs[] =
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{
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{ &cmd, 1, "CMD" },
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{ reg, 8, "REGS" },
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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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setprg8(0x6000, reg[4]);
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setprg8(0x8000, reg[1]);
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setprg8(0xA000, reg[2]);
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setprg8(0xC000, reg[3]);
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setprg8(0xE000, ~0);
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setchr8(0);
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}
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static DECLFW(UNLKS7032Write) {
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// FCEU_printf("bs %04x %02x\n",A,V);
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switch (A & 0xF000) {
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// case 0x8FFF: reg[4]=V; Sync(); break;
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case 0x8000: X6502_IRQEnd(FCEU_IQEXT); IRQCount = (IRQCount & 0x000F) | (V & 0x0F); isirqused = 1; break;
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case 0x9000: X6502_IRQEnd(FCEU_IQEXT); IRQCount = (IRQCount & 0x00F0) | ((V & 0x0F) << 4); isirqused = 1; break;
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case 0xA000: X6502_IRQEnd(FCEU_IQEXT); IRQCount = (IRQCount & 0x0F00) | ((V & 0x0F) << 8); isirqused = 1; break;
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case 0xB000: X6502_IRQEnd(FCEU_IQEXT); IRQCount = (IRQCount & 0xF000) | (V << 12); isirqused = 1; break;
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case 0xC000: if (isirqused) {
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X6502_IRQEnd(FCEU_IQEXT); IRQa = 1;
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}
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break;
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case 0xE000: cmd = V & 7; break;
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case 0xF000: reg[cmd] = V; Sync(); break;
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}
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}
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static void UNLSMB2JIRQHook(int a) {
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if (IRQa) {
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IRQCount += a;
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if (IRQCount >= 0xFFFF) {
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IRQa = 0;
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IRQCount = 0;
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X6502_IRQBegin(FCEU_IQEXT);
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}
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}
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}
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static void UNLKS7032Power(void) {
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Sync();
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SetReadHandler(0x6000, 0x7FFF, CartBR);
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SetReadHandler(0x8000, 0xFFFF, CartBR);
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SetWriteHandler(0x4020, 0xFFFF, UNLKS7032Write);
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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 UNLKS7032_Init(CartInfo *info) {
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info->Power = UNLKS7032Power;
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MapIRQHook = UNLSMB2JIRQHook;
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GameStateRestore = StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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