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forgot to submit boards/cheapocabra.cpp

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rainwarrior 2016-08-31 06:11:03 +00:00
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commit f8d791b465
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/* FCE Ultra - NES/Famicom Emulator
*
* Copyright notice for this file:
* Copyright (C) 2002 Xodnizel
*
* 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
*/
// mapper 111 - Cheapocabra board by Memblers
// http://forums.nesdev.com/viewtopic.php?p=146039
//
// 512k PRG-ROM in 32k pages
// 32k CHR-ROM used as:
// 2 x 8k pattern pages
// 2 x 8k nametable pages
//
// Notes:
// - PRG-ROM is actually flash RAM. Self-flashing should be implemented if battery backed.
// - CHR-RAM for nametables maps to $3000-3FFF as well, but FCEUX internally limits to 4k?
#include "mapinc.h"
static uint8 reg;
static uint8 *CHRRAM = NULL;
static uint32 CHRRAMSIZE;
static SFORMAT StateRegs[] =
{
{ &reg, 1, "REG" },
{ 0 }
};
static void Sync(void) {
// bit 7 controls green LED
// bit 6 controls red LED
int nt = (reg & 0x20) ? 8192 : 0; // bit 5 controls 8k nametable page
int chr = (reg & 0x10) ? 1 : 0; // bit 4 selects 8k CHR page
int prg = (reg & 0x0F); // bits 0-3 select 32k PRG page
nt += (16 * 1024);
for (int n=0; n<4; ++n)
{
setntamem(CHRRAM + nt + (1024 * n),1,n);
}
setchr8r(0x10, chr);
setprg32(0x8000,prg);
}
static DECLFW(M111Write) {
if ((A >= 0x5000 && A <= 0x5FFF) || (A >= 0x7000 && A <= 0x7FFF))
{
reg = V;
Sync();
}
}
static void M111Power(void) {
reg = 0xFF;
Sync();
SetReadHandler(0x8000, 0xffff, CartBR);
SetWriteHandler(0x5000, 0x5fff, M111Write);
SetWriteHandler(0x7000, 0x7fff, M111Write);
}
static void StateRestore(int version) {
Sync();
}
void Mapper111_Init(CartInfo *info) {
info->Power = M111Power;
CHRRAMSIZE = 1024 * 32;
CHRRAM = (uint8*)FCEU_gmalloc(CHRRAMSIZE);
SetupCartCHRMapping(0x10, CHRRAM, CHRRAMSIZE, 1);
GameStateRestore = StateRestore;
AddExState(&StateRegs, ~0, 0, 0);
AddExState(CHRRAM, CHRRAMSIZE, 0, "CRAM");
}