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CaH4e3 2015-07-12 14:10:46 +00:00
parent 4ec95b5b9b
commit 4fd8715890
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trunk/src/boards/et-100.cpp Normal file
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/* 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");
}