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https://github.com/dborth/fceugx.git
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96 lines
2.3 KiB
C++
96 lines
2.3 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[4], IRQa;
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static int16 IRQCount, IRQPause;
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static int16 Count = 0x0000;
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static SFORMAT StateRegs[] =
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{
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{ reg, 4, "REGS" },
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{ &IRQa, 1, "IRQA" },
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{ &IRQCount, 2, "IRQC" },
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{ 0 }
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};
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static void Sync(void) {
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setprg32(0x8000, 0);
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setchr8(0);
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}
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//#define Count 0x1800
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#define Pause 0x010
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static DECLFW(UNL3DBlockWrite) {
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switch (A) {
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//4800 32
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//4900 37
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//4a00 01
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//4e00 18
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case 0x4800: reg[0] = V; break;
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case 0x4900: reg[1] = V; break;
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case 0x4a00: reg[2] = V; break;
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case 0x4e00: reg[3] = V; IRQCount = Count; IRQPause = Pause; IRQa = 1; X6502_IRQEnd(FCEU_IQEXT); break;
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}
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}
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static void UNL3DBlockPower(void) {
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Sync();
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SetReadHandler(0x8000, 0xFFFF, CartBR);
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SetWriteHandler(0x4800, 0x4E00, UNL3DBlockWrite);
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}
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static void UNL3DBlockReset(void) {
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Count += 0x10;
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FCEU_printf("Count=%04x\n", Count);
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}
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static void UNL3DBlockIRQHook(int a) {
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if (IRQa) {
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if (IRQCount > 0) {
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IRQCount -= a;
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} else {
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if (IRQPause > 0) {
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IRQPause -= a;
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X6502_IRQBegin(FCEU_IQEXT);
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} else {
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IRQCount = Count;
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IRQPause = Pause;
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X6502_IRQEnd(FCEU_IQEXT);
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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 UNL3DBlock_Init(CartInfo *info) {
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info->Power = UNL3DBlockPower;
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info->Reset = UNL3DBlockReset;
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MapIRQHook = UNL3DBlockIRQHook;
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GameStateRestore = StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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