106 lines
2.6 KiB
C
106 lines
2.6 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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#include "mmc3.h"
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static void UNLA9746PWrap(uint32 A, uint8 V) {
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setprg8(A, EXPREGS[1] <<4 | V &0x0F);
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}
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static void UNLA9746CWrap(uint32 A, uint8 V) {
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setchr1(A, EXPREGS[1] <<7 | V &0x7F);
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}
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static DECLFW(UNLA9746WriteOuter) {
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switch(A &1) {
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case 0: EXPREGS[1] =EXPREGS[1] &~1 | V >>3 &1; break;
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case 1: EXPREGS[1] =EXPREGS[1] &~2 | V >>4 &2; break;
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}
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FixMMC3PRG(MMC3_cmd);
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FixMMC3CHR(MMC3_cmd);
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}
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static DECLFW(UNLA9746WriteASIC) {
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int index;
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if (A &1)
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{ /* Register data */
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if (~EXPREGS[0] &0x20)
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{ /* Scrambled mode inactive */
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MMC3_CMDWrite(A, V);
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}
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else
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{ /* Scrambled mode active */
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if (MMC3_cmd >=0x08 && MMC3_cmd <=0x1F)
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{ /* Scrambled CHR register */
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index = (MMC3_cmd -8) >>2;
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if (MMC3_cmd &1)
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{ /* LSB nibble */
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DRegBuf[index] &=~0x0F;
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DRegBuf[index] |=V >>1 &0x0F;
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}
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else
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{ /* MSB nibble */
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DRegBuf[index] &=~0xF0;
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DRegBuf[index] |=V <<4 &0xF0;
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}
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FixMMC3CHR(MMC3_cmd);
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}
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else
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if (MMC3_cmd >=0x25 && MMC3_cmd <=0x26)
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{ /* Scrambled PRG register */
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DRegBuf[6 | MMC3_cmd &1] =V >>5 &1 | V >>3 &2 | V >>1 &4 | V <<1 &8;
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FixMMC3PRG(MMC3_cmd);
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}
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}
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}
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else
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{ /* Register index */
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MMC3_CMDWrite(A, V);
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if (A &2) EXPREGS[0] =V;
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}
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}
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static void UNLA9746Power(void) {
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GenMMC3Power();
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SetWriteHandler(0x5000, 0x5FFF, UNLA9746WriteOuter);
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SetWriteHandler(0x8000, 0xBFFF, UNLA9746WriteASIC);
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EXPREGS[0] = 0;
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EXPREGS[1] = 3;
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MMC3RegReset();
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}
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static void UNLA9746Reset(void) {
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EXPREGS[0] = 0;
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EXPREGS[1] = 3;
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MMC3RegReset();
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}
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void UNLA9746_Init(CartInfo *info) {
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GenMMC3_Init(info, 128, 128, 0, 0);
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pwrap = UNLA9746PWrap;
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cwrap = UNLA9746CWrap;
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info->Power = UNLA9746Power;
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info->Reset = UNLA9746Reset;
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AddExState(EXPREGS, 2, 0, "EXPR");
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}
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