diff --git a/trunk/src/boards/et-100.cpp b/trunk/src/boards/et-100.cpp new file mode 100644 index 00000000..b3539ce1 --- /dev/null +++ b/trunk/src/boards/et-100.cpp @@ -0,0 +1,103 @@ +/* FCE Ultra - NES/Famicom Emulator + * + * Copyright notice for this file: + * Copyright (C) 2015 Cluster + * http://clusterrr.com + * clusterrr@clusterrr.com + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/* + MMC3-based multicart mapper with CHR RAM, CHR ROM and PRG RAM + + $6000-7FFF: A~[011xxxxx xxMRSBBB] Multicart reg + This register can only be written to if PRG-RAM is enabled and writable (see $A001) + and BBB = 000 (power on state) + + BBB = CHR+PRG block select bits (A19, A18, A17 for both PRG and CHR) + S = PRG block size (0=256k 1=128k) + R = CHR mode (0=CHR ROM 1=CHR RAM) + M = CHR block size (0=256k 1=128k) + ignored when S is 0 for some reason + + Example Game: + -------------------------- + 6 in 1 multicart (SMB3, TMNT2, Contra, Ninja Cat, Ninja Crusaders, Rainbow Islands 2) +*/ + +#include "mapinc.h" +#include "mmc3.h" + +static uint8 *CHRRAM; +static uint32 CHRRAMSize; + +static void BMC1024CA1PW(uint32 A, uint8 V) { + if ((EXPREGS[0]>>3)&1) + setprg8(A, (V&0x1F) | ((EXPREGS[0] & 7) << 4)); + else + setprg8(A, (V&0x0F) | ((EXPREGS[0] & 7) << 4)); +} + +static void BMC1024CA1CW(uint32 A, uint8 V) { + if ((EXPREGS[0]>>4)&1) + setchr1r(0x10, A, V); + else if (((EXPREGS[0]>>5)&1) && ((EXPREGS[0]>>3)&1)) + setchr1(A, V | ((EXPREGS[0] & 7) << 7)); + else + setchr1(A, (V&0x7F) | ((EXPREGS[0] & 7) << 7)); +} + +static DECLFW(BMC1024CA1Write) { + if (((A001B & 0xC0) == 0x80) && !(EXPREGS[0] & 7)) + { + EXPREGS[0] = A & 0x3F; + FixMMC3PRG(MMC3_cmd); + FixMMC3CHR(MMC3_cmd); + } else { + CartBW(A, V); + } +} + +static void BMC1024CA1Reset(void) { + EXPREGS[0] = 0; + MMC3RegReset(); +} + +static void BMC1024CA1Power(void) { + EXPREGS[0] = 0; + GenMMC3Power(); + SetWriteHandler(0x6000, 0x7FFF, BMC1024CA1Write); +} + +static void BMC1024CA1Close(void) { + if (CHRRAM) + FCEU_gfree(CHRRAM); + CHRRAM = NULL; +} + +void BMC1024CA1_Init(CartInfo *info) { + GenMMC3_Init(info, 256, 256, 8, 0); + CHRRAMSize = 8192; + CHRRAM = (uint8*)FCEU_gmalloc(CHRRAMSize); + SetupCartCHRMapping(0x10, CHRRAM, CHRRAMSize, 1); + AddExState(CHRRAM, CHRRAMSize, 0, "CHRR"); + pwrap = BMC1024CA1PW; + cwrap = BMC1024CA1CW; + info->Power = BMC1024CA1Power; + info->Reset = BMC1024CA1Reset; + info->Close = BMC1024CA1Close; + AddExState(EXPREGS, 1, 0, "EXPR"); +}