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https://github.com/dborth/fceugx.git
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154 lines
2.9 KiB
C
154 lines
2.9 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) 2002 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 cmdin;
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static uint8 cmd;
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static uint8 regs[8];
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static uint8 master,chrm;
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static int32 IRQCount,IRQa;
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static void DoPRG(void)
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{
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if(master&0x80)
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{
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if(master&0x20)
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{
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setprg32(0x8000,(master&0xF)>>1);
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}
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else
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{
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setprg16(0x8000,master&0xF);
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setprg16(0xC000,master&0xF);
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}
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}
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else
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{
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setprg8(0xA000,regs[4]);
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setprg8(0xE000,~0);
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if(cmd&0x40)
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{
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setprg8(0xC000,regs[2]);
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setprg8(0x8000,~1);
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}
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else
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{
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setprg8(0x8000,regs[2]);
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setprg8(0xC000,~1);
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}
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}
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}
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static void DoCHR(void)
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{
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uint32 base=(cmd&0x80)<<5;
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int orie=(chrm&0x4)<<6;
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setchr2(0x0000^base,(orie|regs[0])>>1); //K
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setchr2(0x0800^base,(orie|regs[3])>>1); //43
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setchr1(0x1000,orie|regs[1]);
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setchr1(0x1400,orie|regs[5]);
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setchr1(0x1800,orie|regs[6]);
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setchr1(0x1c00,orie|regs[7]);
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}
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static DECLFW(UNL8237Write)
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{
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switch(A&0xF000)
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{
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case 0xf000:IRQCount=V;break;
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case 0xE000:X6502_IRQEnd(FCEU_IQEXT);break;
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}
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// if(A<0x8000)
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// printf("$%04x:$%02x, %d\n",A&0xFFFF,V,scanline);
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if(A==0x5000)
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{
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master=V;
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DoPRG();
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DoCHR();
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}
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else if(A==0x5001)
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{
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chrm=V;
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DoCHR();
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}
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else
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switch(A&0xE000)
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{
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case 0x8000:setmirror(((V|(V>>7))&1)^1);break;
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case 0xa000:cmd=V;cmdin=1;DoPRG();DoCHR();break;
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case 0xC000:if(!cmdin) break;
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regs[cmd&7]=V;
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DoPRG();
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DoCHR();
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cmdin=0;
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break;
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}
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}
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static void UNL8237Reset(void)
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{
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int x;
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for(x=0;x<8;x++) regs[x]=0;
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master=chrm=cmd=cmdin=IRQCount=IRQa=0;
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SetReadHandler(0x8000,0xFFFF,CartBR);
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SetWriteHandler(0x5000,0xFFFF,UNL8237Write);
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DoPRG();
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DoCHR();
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}
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static void hooko(void)
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{
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if(IRQCount)
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{
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IRQCount--;
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if(!IRQCount)
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{
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X6502_IRQBegin(FCEU_IQEXT);
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//printf("IRQ: %d\n",scanline);
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}
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}
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}
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static void restoreo(int version)
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{
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DoPRG();
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DoCHR();
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}
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void UNL8237_Init(CartInfo *info)
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{
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GameStateRestore=restoreo;
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GameHBIRQHook=hooko;
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info->Power=UNL8237Reset;
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AddExState(regs, 8, 0, "REGS");
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AddExState(&IRQCount, 4, 1, "IRQC");
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AddExState(&IRQa, 1, 0, "IRQA");
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AddExState(&master, 1, 0, "MAST");
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AddExState(&chrm,1,0,"CHRM");
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AddExState(&cmd,1,0,"CMD");
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AddExState(&cmdin,1,0,"CMDI");
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}
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