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https://github.com/dborth/fceugx.git
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98 lines
2.4 KiB
C++
98 lines
2.4 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 Conversions
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*
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* Super Mario Bros 2j (Alt Full) is a BAD incomplete dump, should be mapper 43
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*
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* Both Voleyball and Zanac by Whirlind Manu shares the same PCB, but with
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* some differences: Voleyball has 8K CHR ROM and 8K ROM at 6000K, Zanac
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* have 8K CHR RAM and banked 16K ROM mapper at 6000 as two 8K banks.
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*
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* Super Mario Bros 2j (Alt Small) uses additionally IRQ timer to drive framerate
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*
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* PCB for this mapper is "09-034A"
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*/
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#include "mapinc.h"
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static uint8 prg;
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static uint32 IRQCount, IRQa;
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static SFORMAT StateRegs[] =
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{
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{ &IRQCount, 4, "IRQC" },
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{ &IRQa, 4, "IRQA" },
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{ &prg, 1, "PRG" },
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{ 0 }
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};
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static void Sync(void) {
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setprg8r(1, 0x6000, prg);
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setprg32(0x8000, 0);
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setchr8(0);
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}
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static DECLFW(UNLSMB2JWrite1) {
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prg = V & 1;
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Sync();
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}
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static DECLFW(UNLSMB2JWrite2) {
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IRQa = V & 1;
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IRQCount = 0;
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X6502_IRQEnd(FCEU_IQEXT);
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}
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static DECLFR(UNLSMB2JRead) {
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return 0xFF;
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}
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static void UNLSMB2JPower(void) {
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prg = 0;
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Sync();
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SetReadHandler(0x6000, 0xFFFF, CartBR);
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SetReadHandler(0x4042, 0x4055, UNLSMB2JRead);
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SetWriteHandler(0x4068, 0x4068, UNLSMB2JWrite2);
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SetWriteHandler(0x4027, 0x4027, UNLSMB2JWrite1);
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}
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static void UNLSMB2JIRQHook(int a) {
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if (IRQa)
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{
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if (IRQCount < 5750) // completely by guess
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IRQCount += a;
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else {
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IRQa = 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 StateRestore(int version) {
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Sync();
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}
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void UNLSMB2J_Init(CartInfo *info) {
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info->Power = UNLSMB2JPower;
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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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