mirror of
https://github.com/dborth/fceugx.git
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124 lines
3.1 KiB
C++
124 lines
3.1 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) 2009 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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* YOKO Mortal Kombat V Pro, VRC7 pirate clone
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*/
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#include "mapinc.h"
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static uint8 prg[3], chr[8], mirr;
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static uint8 IRQLatch, IRQa, IRQd;
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static uint32 IRQCount, CycleCount;
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static SFORMAT StateRegs[] =
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{
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{ prg, 3, "PRG" },
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{ chr, 8, "CHR" },
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{ &mirr, 1, "MIRR" },
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{ &IRQa, 1, "IRQA" },
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{ &IRQd, 1, "IRQD" },
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{ &IRQLatch, 1, "IRQL" },
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{ &IRQCount, 4, "IRQC" },
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{ &CycleCount, 4, "CYCC" },
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{ 0 }
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};
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static void Sync(void) {
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uint8 i;
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setprg8(0x8000, prg[0]);
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setprg8(0xa000, prg[1]);
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setprg8(0xc000, prg[2]);
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setprg8(0xe000, ~0);
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for (i = 0; i < 8; i++)
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setchr1(i << 10, chr[i]);
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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(UNLVRC7Write) {
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switch (A & 0xF008) {
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case 0x8000: prg[0] = V; Sync(); break;
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case 0x8008: prg[1] = V; Sync(); break;
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case 0x9000: prg[2] = V; Sync(); break;
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case 0xa000: chr[0] = V; Sync(); break;
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case 0xa008: chr[1] = V; Sync(); break;
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case 0xb000: chr[2] = V; Sync(); break;
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case 0xb008: chr[3] = V; Sync(); break;
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case 0xc000: chr[4] = V; Sync(); break;
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case 0xc008: chr[5] = V; Sync(); break;
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case 0xd000: chr[6] = V; Sync(); break;
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case 0xd008: chr[7] = V; Sync(); break;
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case 0xe000: mirr = V; Sync(); break;
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case 0xe008:
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IRQLatch = V;
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X6502_IRQEnd(FCEU_IQEXT);
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break;
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case 0xf000:
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IRQa = V & 2;
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IRQd = V & 1;
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if (V & 2)
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IRQCount = IRQLatch;
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CycleCount = 0;
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X6502_IRQEnd(FCEU_IQEXT);
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break;
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case 0xf008:
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if (IRQd)
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IRQa = 1;
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else
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IRQa = 0;
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X6502_IRQEnd(FCEU_IQEXT);
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break;
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}
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}
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static void UNLVRC7Power(void) {
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Sync();
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SetReadHandler(0x8000, 0xFFFF, CartBR);
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SetWriteHandler(0x8000, 0xFFFF, UNLVRC7Write);
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}
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static void UNLVRC7IRQHook(int a) {
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if (IRQa) {
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CycleCount += a * 3;
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while (CycleCount >= 341) {
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CycleCount -= 341;
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IRQCount++;
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if (IRQCount == 248) {
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X6502_IRQBegin(FCEU_IQEXT);
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IRQCount = IRQLatch;
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}
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}
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}
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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 UNLVRC7_Init(CartInfo *info) {
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info->Power = UNLVRC7Power;
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MapIRQHook = UNLVRC7IRQHook;
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GameStateRestore = StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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