mirror of
https://github.com/dborth/fceugx.git
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111 lines
2.3 KiB
C++
111 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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{
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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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{
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switch(A)
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{
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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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{
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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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{
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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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{
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if(IRQa)
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{
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if(IRQCount>0)
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{
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IRQCount-=a;
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}
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else
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{
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if(IRQPause>0)
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{
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IRQPause-=a;
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X6502_IRQBegin(FCEU_IQEXT);
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}
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else
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{
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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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{
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Sync();
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}
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void UNL3DBlock_Init(CartInfo *info)
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{
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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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