134 lines
3.4 KiB
C
134 lines
3.4 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) 2025 NewRisingSun
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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 "asic_fme7.h"
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static void (*FME7_cbSync)();
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static uint8 FME7_index;
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static uint8 FME7_reg[16];
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static SFORMAT FME7_stateRegs[] = {
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{ &FME7_index, 1, "FM7I" },
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{ FME7_reg, 16, "FM7R" },
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{ 0 }
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};
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void FME7_syncWRAM (int OR) {
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if (PRGsize[0x10] && FME7_reg[8] &0x40) setprg8r(0x10, 0x6000, FME7_reg[8] | OR);
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}
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void FME7_syncPRG (int AND, int OR) {
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if (~FME7_reg[8] &0x40) setprg8(0x6000, FME7_reg[8] &AND | OR);
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setprg8(0x8000, FME7_reg[ 9] &AND | OR);
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setprg8(0xA000, FME7_reg[10] &AND | OR);
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setprg8(0xC000, FME7_reg[11] &AND | OR);
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setprg8(0xE000, 0xFF &AND | OR);
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}
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void FME7_syncCHR (int AND, int OR) {
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setchr1(0x0000, FME7_reg[0] &AND | OR);
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setchr1(0x0400, FME7_reg[1] &AND | OR);
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setchr1(0x0800, FME7_reg[2] &AND | OR);
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setchr1(0x0C00, FME7_reg[3] &AND | OR);
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setchr1(0x1000, FME7_reg[4] &AND | OR);
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setchr1(0x1400, FME7_reg[5] &AND | OR);
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setchr1(0x1800, FME7_reg[6] &AND | OR);
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setchr1(0x1C00, FME7_reg[7] &AND | OR);
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}
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void FME7_syncMirror () {
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setmirror(FME7_reg[12] &2? (FME7_reg[12] &1? MI_1: MI_0): FME7_reg[12] &1? MI_H: MI_V);
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}
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DECLFR (FME7_readWRAM) {
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return ~FME7_reg[8] &0x40 || FME7_reg[8] &0x80? CartBR(A): A >>8;
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}
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DECLFW (FME7_writeWRAM) {
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if (FME7_reg[8] &0x80) CartBW(A, V);
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}
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DECLFW (FME7_writeReg) {
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if (A &0x2000) {
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FME7_reg[FME7_index &0xF] = V;
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if ((FME7_index &0xF) == 13) X6502_IRQEnd(FCEU_IQEXT);
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FME7_cbSync();
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} else
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FME7_index = V;
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}
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void FP_FASTAPASS(1) FME7_cpuCycle (int a) {
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while (a--) {
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int16_t counter = FME7_reg[14] | FME7_reg[15] <<8;
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if (FME7_reg[13] &0x80 && !--counter && FME7_reg[13] &0x01) X6502_IRQBegin(FCEU_IQEXT);
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FME7_reg[14] = counter &0xFF;
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FME7_reg[15] = counter >>8;
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}
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}
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void FME7_clear () {
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int i;
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for (i = 0; i < 16; i++) FME7_reg[i] = 0;
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FME7_cbSync();
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}
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static void FME7_setHandlers () {
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SetReadHandler(0x6000, 0x7FFF, FME7_readWRAM);
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SetWriteHandler(0x6000, 0x7FFF, FME7_writeWRAM);
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SetReadHandler(0x8000, 0xFFFF, CartBR);
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SetWriteHandler(0x8000, 0xBFFF, FME7_writeReg);
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MapIRQHook = FME7_cpuCycle;
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}
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static void FME7_configure (void (*sync)()) {
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FME7_cbSync = sync;
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}
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void FME7_activate (uint8 clear, void (*sync)()) {
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FME7_configure(sync);
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FME7_setHandlers();
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if (clear)
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FME7_clear();
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else
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FME7_cbSync();
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}
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void FME7_addExState () {
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AddExState(FME7_stateRegs, ~0, 0, 0);
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}
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void FME7_restore (int version) {
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FME7_cbSync();
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}
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void FME7_power () {
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FME7_setHandlers();
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FME7_clear();
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}
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void FME7_init (CartInfo *info, void (*sync)()) {
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FME7_addExState();
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FME7_configure(sync);
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info->Power = FME7_power;
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info->Reset = FME7_cbSync;
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GameStateRestore = FME7_restore;
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}
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