120 lines
3.0 KiB
C
120 lines
3.0 KiB
C
/* FCEUmm - NES/Famicom Emulator
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*
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* Copyright notice for this file:
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* Copyright (C) 2019 Libretro Team
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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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/* NES 2.0 Mapper 526 is used for a bootleg version of Namco's 三国志: 中原の覇者 (Sangokushi: Chūgen no Hasha).
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* Its UNIF board name is UNL-BJ-56.
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* Mirroring seems to be hard-wired (to vertical).
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* https://wiki.nesdev.com/w/index.php/NES_2.0_Mapper_526
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*/
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#include "mapinc.h"
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static uint8 preg[4], creg[8];
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static uint32 IRQCount;
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static uint8 *WRAM = NULL;
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static uint32 WRAMSIZE;
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static SFORMAT StateRegs[] =
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{
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{ preg, 4, "PREG" },
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{ creg, 8, "CREG" },
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{ &IRQCount, 4, "IRQC" },
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{ 0 }
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};
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static void Sync(void) {
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uint8 i;
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setprg8r(0x10, 0x6000, 0);
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setprg8(0x8000, preg[0]);
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setprg8(0xA000, preg[1]);
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setprg8(0xC000, preg[2]);
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setprg8(0xE000, preg[3]);
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for (i = 0; i < 8; i++)
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setchr1((i << 10), creg[i]);
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setmirror(MI_V);
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}
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static DECLFW(UNLBJ56Write) {
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/* FCEU_printf("Wr: A:%04x V:%02x\n", A, V); */
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A &= 0xF00F;
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if (A <= 0x8007) {
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creg[A & 0x07] = V;
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Sync();
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} else if (A <= 0x800B) {
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preg[A & 0x03] = V;
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Sync();
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} else {
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switch (A & 0x0F) {
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case 0x0D:
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case 0x0F:
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/* One of these two acknowledges a pending IRQ, and the other
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* resets to IRQ counter to zero. Because they are always written
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* to one after the other, it's not clear which one does which. */
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X6502_IRQEnd(FCEU_IQEXT);
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IRQCount = 0;
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break;
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}
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}
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}
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static void FP_FASTAPASS(1) UNLBJ56IRQHook(int a) {
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IRQCount += a;
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if (IRQCount & 4096)
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X6502_IRQBegin(FCEU_IQEXT);
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}
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static void UNLBJ56Close(void) {
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if (WRAM)
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FCEU_gfree(WRAM);
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WRAM = NULL;
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}
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static void UNLBJ56Power(void) {
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preg[0] = ~3;
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preg[1] = ~2;
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preg[2] = ~1;
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preg[3] = ~0;
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Sync();
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SetReadHandler(0x6000, 0xFFFF, CartBR);
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SetWriteHandler(0x6000, 0x7FFF, CartBW);
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SetWriteHandler(0x8000, 0x800F, UNLBJ56Write);
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FCEU_CheatAddRAM(WRAMSIZE >> 10, 0x6000, WRAM);
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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 UNLBJ56_Init(CartInfo *info) {
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info->Power = UNLBJ56Power;
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info->Close = UNLBJ56Close;
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MapIRQHook = UNLBJ56IRQHook;
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GameStateRestore = StateRestore;
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WRAMSIZE = 8192;
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WRAM = (uint8*)FCEU_gmalloc(WRAMSIZE);
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SetupCartPRGMapping(0x10, WRAM, WRAMSIZE, 1);
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if (info->battery) {
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info->SaveGame[0] = WRAM;
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info->SaveGameLen[0] = WRAMSIZE;
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}
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AddExState(WRAM, WRAMSIZE, 0, "WRAM");
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AddExState(&StateRegs, ~0, 0, 0);
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}
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