dc85a40951
- use shorter strings for state names - make variables static - turn C++ comments to C comments - cleanup dead code in boards
110 lines
2.7 KiB
C
110 lines
2.7 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) 2015 CaH4e3
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* Copyright (C) 2020 dragon2snow,loong2snow from www.nesbbs.com
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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 regs[2];
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static uint8 _submapper = 0;
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static SFORMAT StateRegs[] =
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{
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{ regs, 2, "REGS" },
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{ &_submapper ,1, "SUBM"},
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{ 0 }
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};
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/* submapper 1 The code for the original fceux
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* submapper 0 new HP898F code by dragon2snow,loong2snow from www.nesbbs.com
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*/
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static void Sync(void) {
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if (_submapper == 1)
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{
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uint8 chr = (regs[0] >> 4) & 7;
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uint8 prg = (regs[1] >> 3) & 7;
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uint8 dec = (regs[1] >> 4) & 4;
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setchr8(chr & (~(((regs[0] & 1) << 2) | (regs[0] & 2))));
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setprg16(0x8000, prg & (~dec));
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setprg16(0xC000, prg | dec);
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setmirror(regs[1] >> 7);
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}
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else
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{
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if (regs[1] & 0x40)
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setprg32(0x8000, regs[1] >> 1);
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else {
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setprg16(0x8000, regs[1]);
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setprg16(0xC000, regs[1]);
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}
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setchr8((regs[0] >> 4) &~(((regs[0] & 1) ? 4 : 0) | (regs[0] & 2)));
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if (regs[1] & 0x80)
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setmirror(1);
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else
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setmirror(0);
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}
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}
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static DECLFW(HP898FWrite) {
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if((A & 0x6000) == 0x6000) {
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regs[(A & 4) >> 2] = V;
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Sync();
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}
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}
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static DECLFW(HP898FWriteEx) {
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switch (A & 4) {
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case 0: regs[0] = V; break; /* CHR */
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case 4: regs[1] = (V & 0xC0) | ((V >> 2) & 6) | ((V & 0x20) ? 1 : 0); break; /* PRG */
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}
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Sync();
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}
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static void HP898FPower(void) {
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regs[0] = regs[1] = 0;
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Sync();
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if (_submapper == 1)
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{
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SetReadHandler(0x8000, 0xFFFF, CartBR);
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SetWriteHandler(0x6000, 0xFFFF, HP898FWrite);
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}
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else
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{
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SetReadHandler(0x8000, 0xFFFF, CartBR);
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SetWriteHandler(0x6000, 0x7FFF, HP898FWriteEx);
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SetWriteHandler(0xE000, 0xFFFF, HP898FWriteEx);
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}
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}
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static void HP898FReset(void) {
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regs[0] = regs[1] = 0;
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Sync();
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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 BMCHP898F_Init(CartInfo *info) {
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_submapper = info->submapper;
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info->Reset = HP898FReset;
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info->Power = HP898FPower;
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GameStateRestore = StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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