mirror of
https://github.com/dborth/fceugx.git
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163 lines
3.1 KiB
C
163 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) 2003 Xodnizel
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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "mapinc.h"
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static uint8 LastWr;
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static uint8 ExtMode;
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static uint8 cmd;
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static uint8 DRegs[8];
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static uint32 count=0;
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static uint32 last=0;
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static int safe=0;
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static uint8 poofish;
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static void Sync(void)
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{
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int x;
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uint32 base=0;
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if(cmd&0x80) base=0x1000;
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setchr2(0x0000^base,(0x100|DRegs[0])>>1);
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setchr2(0x0800^base,(0x100|DRegs[1])>>1);
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for(x=0;x<4;x++)
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setchr1((0x1000^base)+x*0x400,DRegs[2+x]);
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if(ExtMode&0x80)
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{
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if(ExtMode&0x20)
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setprg32(0x8000,(ExtMode&0x1F)>>1);
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else
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{
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setprg16(0x8000,(ExtMode&0x1F));
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setprg16(0xc000,(ExtMode&0x1F));
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}
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}
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else
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{
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setprg8(0x8000,DRegs[6]);
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setprg8(0xc000,~1);
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setprg8(0xa000,DRegs[7]);
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setprg8(0xe000,~0);
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}
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}
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static DECLFW(M187Write)
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{
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LastWr=V;
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if(A==0x5000)
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ExtMode=V;
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Sync();
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}
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static DECLFW(M187HWrite)
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{
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//if(A==0x8003 && X.PC<0x800) FCEUI_DumpMem("dmp",0x0000,0xFFFF);
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//printf("$%04x:$%02x, %04x\n",A,V,X.PC);
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LastWr=V;
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if(A==0x8003)
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{
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if(V==0x28 || V==0x2A)
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poofish=V;
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}
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else if(A==0x8000) poofish=0;
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switch(A)
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{
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case 0xc000:IRQLatch=IRQCount=V;break;
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case 0xc001:IRQCount=IRQLatch;last=count=0;break;
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case 0xe000:IRQa=0;X6502_IRQEnd(FCEU_IQEXT);break;
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case 0xe001:IRQa=1;break;
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case 0xa000:MIRROR_SET(V&1);break;
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case 0x8000:cmd=V;safe=1;break;
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case 0x8001:
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if(safe)
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{
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//printf("Cmd: %d, %02x, %04x\n",cmd&0x7,V,X.PC);
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DRegs[cmd&7]=V;
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Sync();
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safe=0;
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}
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if(poofish==0x28) setprg8(0xc000,0x17);
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break;
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}
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}
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static DECLFR(ProtRead)
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{
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switch(LastWr&0x3)
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{
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case 0x1:
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case 0x0: return(0x80);
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case 0x2: return(0x42);
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}
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return(0);
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}
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static void M187Power(void)
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{
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SetWriteHandler(0x5000,0x5fff,M187Write);
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SetWriteHandler(0x8000,0xFFFF,M187HWrite);
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SetReadHandler(0x5000,0x5FFF,ProtRead);
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SetWriteHandler(0x6000,0x7FFF,M187Write);
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SetReadHandler(0x8000,0xffff,CartBR);
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Sync();
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}
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static void sl(void)
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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--;
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if(IRQCount<0)
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{
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X6502_IRQBegin(FCEU_IQEXT);
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}
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}
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}
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}
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static void FP_FASTAPASS(1) foo(uint32 A)
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{
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if((A&0x2000) && !(last&0x2000))
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{
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count++;
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if(count==42)
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{
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sl();
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count=0;
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}
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}
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last=A;
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}
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void Mapper187_Init(CartInfo *info)
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{
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info->Power=M187Power;
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//GameHBIRQHook=sl;
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PPU_hook=foo;
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}
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