Initial commit - http://sourceforge.net/p/fceumm/code/160/
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twinaphex
270
src/boards/vrc2and4.c
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270
src/boards/vrc2and4.c
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/* 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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* VRC-2/VRC-4 Konami
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* VRC-4 Pirate
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*/
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#include "mapinc.h"
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static uint8 isPirate, is22;
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static uint16 IRQCount;
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static uint8 IRQLatch, IRQa;
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static uint8 prgreg[2], chrreg[8];
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static uint16 chrhi[8];
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static uint8 regcmd, irqcmd, mirr, big_bank;
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static uint16 acount = 0;
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static uint16 weirdo = 0;
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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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{ prgreg, 2, "PREG" },
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{ chrreg, 8, "CREG" },
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{ chrhi, 16, "CRGH" },
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{ ®cmd, 1, "CMDR" },
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{ &irqcmd, 1, "CMDI" },
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{ &mirr, 1, "MIRR" },
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{ &big_bank, 1, "BIGB" },
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{ &IRQCount, 2, "IRQC" },
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{ &IRQLatch, 1, "IRQL" },
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{ &IRQa, 1, "IRQA" },
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{ 0 }
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};
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static void Sync(void) {
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if (regcmd & 2) {
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setprg8(0xC000, prgreg[0] | big_bank);
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setprg8(0x8000, ((~1) & 0x1F) | big_bank);
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} else {
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setprg8(0x8000, prgreg[0] | big_bank);
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setprg8(0xC000, ((~1) & 0x1F) | big_bank);
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}
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setprg8(0xA000, prgreg[1] | big_bank);
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setprg8(0xE000, ((~0) & 0x1F) | big_bank);
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if (UNIFchrrama)
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setchr8(0);
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else {
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uint8 i;
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if (!weirdo)
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for (i = 0; i < 8; i++)
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setchr1(i << 10, (chrhi[i] | chrreg[i]) >> is22);
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else {
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setchr1(0x0000, 0xFC);
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setchr1(0x0400, 0xFD);
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setchr1(0x0800, 0xFF);
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weirdo--;
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}
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}
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switch (mirr & 0x3) {
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case 0: setmirror(MI_V); break;
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case 1: setmirror(MI_H); break;
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case 2: setmirror(MI_0); break;
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case 3: setmirror(MI_1); break;
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}
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}
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static DECLFW(VRC24Write) {
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A &= 0xF003;
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if ((A >= 0xB000) && (A <= 0xE003)) {
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if (UNIFchrrama)
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big_bank = (V & 8) << 2; // my personally many-in-one feature ;) just for support pirate cart 2-in-1
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else {
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uint16 i = ((A >> 1) & 1) | ((A - 0xB000) >> 11);
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uint16 nibble = ((A & 1) << 2);
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chrreg[i] = (chrreg[i] & (0xF0 >> nibble)) | ((V & 0xF) << nibble);
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if (nibble)
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chrhi[i] = (V & 0x10) << 4; // another one many in one feature from pirate carts
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}
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Sync();
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} else
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switch (A & 0xF003) {
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case 0x8000:
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case 0x8001:
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case 0x8002:
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case 0x8003:
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if (!isPirate) {
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prgreg[0] = V & 0x1F;
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Sync();
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}
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break;
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case 0xA000:
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case 0xA001:
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case 0xA002:
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case 0xA003:
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if (!isPirate)
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prgreg[1] = V & 0x1F;
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else {
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prgreg[0] = (V & 0x1F) << 1;
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prgreg[1] = ((V & 0x1F) << 1) | 1;
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}
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Sync();
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break;
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case 0x9000:
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case 0x9001: if (V != 0xFF) mirr = V; Sync(); break;
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case 0x9002:
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case 0x9003: regcmd = V; Sync(); break;
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case 0xF000: X6502_IRQEnd(FCEU_IQEXT); IRQLatch &= 0xF0; IRQLatch |= V & 0xF; break;
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case 0xF001: X6502_IRQEnd(FCEU_IQEXT); IRQLatch &= 0x0F; IRQLatch |= V << 4; break;
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case 0xF002: X6502_IRQEnd(FCEU_IQEXT); acount = 0; IRQCount = IRQLatch; IRQa = V & 2; irqcmd = V & 1; break;
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case 0xF003: X6502_IRQEnd(FCEU_IQEXT); IRQa = irqcmd; break;
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}
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}
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static DECLFW(M21Write) {
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A = (A & 0xF000) | ((A >> 1) & 0x3); // Ganbare Goemon Gaiden 2 - Tenka no Zaihou (J) [!] isn't mapper 21 actually,
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// it's mapper 23 by wirings
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VRC24Write(A, V);
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}
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static DECLFW(M22Write) {
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if (A == 0xC007) { // Ganbare Goemon Gaiden does strange things!!! at the end credits
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weirdo = 8; // quick dirty hack, seems there is no other games with such PCB, so
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// we never know if it will not work for something else lol
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}
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A |= ((A >> 2) & 0x3); // It's just swapped lines from 21 mapper
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//
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VRC24Write((A & 0xF000) | ((A >> 1) & 1) | ((A << 1) & 2), V);
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}
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static DECLFW(M23Write) {
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A |= ((A >> 2) & 0x3) | ((A >> 4) & 0x3) | ((A >> 6) & 0x3);// actually there is many-in-one mapper source, some pirate or
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// licensed games use various address bits for registers
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VRC24Write(A, V);
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}
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static void M21Power(void) {
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Sync();
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SetReadHandler(0x8000, 0xFFFF, CartBR);
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SetWriteHandler(0x8000, 0xFFFF, M21Write);
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}
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static void M22Power(void) {
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Sync();
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SetReadHandler(0x8000, 0xFFFF, CartBR);
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SetWriteHandler(0x8000, 0xFFFF, M22Write);
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}
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static void M23Power(void) {
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big_bank = 0x20;
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Sync();
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setprg8r(0x10, 0x6000, 0); // Only two Goemon games are have battery backed RAM, three more shooters
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// (Parodius Da!, Gradius 2 and Crisis Force uses 2k or SRAM at 6000-67FF only
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SetReadHandler(0x6000, 0x7FFF, CartBR);
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SetWriteHandler(0x6000, 0x7FFF, CartBW);
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SetReadHandler(0x8000, 0xFFFF, CartBR);
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SetWriteHandler(0x8000, 0xFFFF, M23Write);
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}
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static void M25Power(void) {
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big_bank = 0x20;
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Sync();
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setprg8r(0x10, 0x6000, 0);
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SetReadHandler(0x6000, 0x7FFF, CartBR);
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SetWriteHandler(0x6000, 0x7FFF, CartBW);
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SetReadHandler(0x8000, 0xFFFF, CartBR);
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SetWriteHandler(0x8000, 0xFFFF, M22Write);
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}
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void FP_FASTAPASS(1) VRC24IRQHook(int a) {
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#define LCYCS 341
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if (IRQa) {
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acount += a * 3;
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if (acount >= LCYCS) {
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while (acount >= LCYCS) {
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acount -= LCYCS;
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IRQCount++;
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if (IRQCount & 0x100) {
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X6502_IRQBegin(FCEU_IQEXT);
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IRQCount = IRQLatch;
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}
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}
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}
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}
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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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static void VRC24Close(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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void Mapper21_Init(CartInfo *info) {
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isPirate = 0;
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is22 = 0;
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info->Power = M21Power;
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MapIRQHook = VRC24IRQHook;
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GameStateRestore = StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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void Mapper22_Init(CartInfo *info) {
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isPirate = 0;
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is22 = 1;
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info->Power = M22Power;
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GameStateRestore = StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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void VRC24_Init(CartInfo *info) {
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info->Close = VRC24Close;
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MapIRQHook = VRC24IRQHook;
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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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AddExState(WRAM, WRAMSIZE, 0, "WRAM");
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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(&StateRegs, ~0, 0, 0);
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}
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void Mapper23_Init(CartInfo *info) {
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isPirate = 0;
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is22 = 0;
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info->Power = M23Power;
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VRC24_Init(info);
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}
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void Mapper25_Init(CartInfo *info) {
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isPirate = 0;
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is22 = 0;
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info->Power = M25Power;
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VRC24_Init(info);
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}
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void UNLT230_Init(CartInfo *info) {
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isPirate = 1;
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is22 = 0;
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info->Power = M23Power;
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VRC24_Init(info);
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}
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