mirror of
https://github.com/dborth/fceugx.git
synced 2024-11-01 15:05:05 +01:00
269 lines
7.0 KiB
C++
269 lines
7.0 KiB
C++
/* FCE Ultra - NES/Famicom Emulator
|
|
*
|
|
* Copyright notice for this file:
|
|
* Copyright (C) 2014 CaitSith2
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
/*
|
|
* Roms still using NES 1.0 format should be loaded as 32K CHR RAM.
|
|
* Roms defined under NES 2.0 should use the VRAM size field, defining 7, 8 or 9, based on how much VRAM should be present.
|
|
* UNIF doesn't have this problem, because unique board names can define this information.
|
|
* The UNIF names are UNROM-512-8K, UNROM-512-16K and UNROM-512-32K
|
|
*
|
|
* The battery flag in the NES header enables flash, Mirrror mode 2 Enables MI_0 and MI_1 mode.
|
|
* Known games to use this board are:
|
|
* Battle Kid 2: Mountain of Torment (512K PRG, 8K CHR RAM, Horizontal Mirroring, Flash disabled)
|
|
* Study Hall (128K PRG (in 512K flash chip), 8K CHR RAM, Horizontal Mirroring, Flash enabled)
|
|
* Although Xmas 2013 uses a different board, where LEDs can be controlled (with writes to the $8000-BFFF space),
|
|
* it otherwise functions identically.
|
|
*/
|
|
|
|
#include "mapinc.h"
|
|
#include "../ines.h"
|
|
|
|
static uint8 latche, latcheinit, bus_conflict, chrram_mask, software_id=false;
|
|
static uint16 latcha;
|
|
static uint8 *flashdata;
|
|
static uint32 *flash_write_count;
|
|
static uint8 *FlashPage[32];
|
|
static uint32 *FlashWriteCountPage[32];
|
|
static uint8 flashloaded = false;
|
|
|
|
static uint8 flash_save=0, flash_state=0, flash_mode=0, flash_bank;
|
|
static void (*WLSync)(void);
|
|
static void (*WHSync)(void);
|
|
|
|
static INLINE void setfpageptr(int s, uint32 A, uint8 *p) {
|
|
uint32 AB = A >> 11;
|
|
int x;
|
|
|
|
if (p)
|
|
for (x = (s >> 1) - 1; x >= 0; x--) {
|
|
FlashPage[AB + x] = p - A;
|
|
}
|
|
else
|
|
for (x = (s >> 1) - 1; x >= 0; x--) {
|
|
FlashPage[AB + x] = 0;
|
|
}
|
|
}
|
|
|
|
void setfprg16(uint32 A, uint32 V) {
|
|
if (PRGsize[0] >= 16384) {
|
|
V &= PRGmask16[0];
|
|
setfpageptr(16, A, flashdata ? (&flashdata[V << 14]) : 0);
|
|
} else {
|
|
uint32 VA = V << 3;
|
|
int x;
|
|
|
|
for (x = 0; x < 8; x++)
|
|
setfpageptr(2, A + (x << 11), flashdata ? (&flashdata[((VA + x) & PRGmask2[0]) << 11]) : 0);
|
|
}
|
|
}
|
|
|
|
void inc_flash_write_count(uint8 bank, uint32 A)
|
|
{
|
|
flash_write_count[(bank*4) + ((A&0x3000)>>12)]++;
|
|
if(!flash_write_count[(bank*4) + ((A&0x3000)>>12)])
|
|
flash_write_count[(bank*4) + ((A&0x3000)>>12)]++;
|
|
}
|
|
|
|
uint32 GetFlashWriteCount(uint8 bank, uint32 A)
|
|
{
|
|
return flash_write_count[(bank*4) + ((A&0x3000)>>12)];
|
|
}
|
|
|
|
static void StateRestore(int version) {
|
|
WHSync();
|
|
}
|
|
|
|
static DECLFW(UNROM512LLatchWrite)
|
|
{
|
|
latche = V;
|
|
latcha = A;
|
|
WLSync();
|
|
}
|
|
|
|
static DECLFW(UNROM512HLatchWrite)
|
|
{
|
|
if (bus_conflict)
|
|
latche = (V == CartBR(A)) ? V : 0;
|
|
else
|
|
latche = V;
|
|
latcha = A;
|
|
WHSync();
|
|
}
|
|
|
|
static DECLFR(UNROM512LatchRead)
|
|
{
|
|
uint8 flash_id[3]={0xB5,0xB6,0xB7};
|
|
if(software_id)
|
|
{
|
|
if(A&1)
|
|
return flash_id[ROM_size>>4];
|
|
else
|
|
return 0xBF;
|
|
}
|
|
if(flash_save)
|
|
{
|
|
if(A < 0xC000)
|
|
{
|
|
if(GetFlashWriteCount(flash_bank,A))
|
|
return FlashPage[A >> 11][A];
|
|
}
|
|
else
|
|
{
|
|
if(GetFlashWriteCount(ROM_size-1,A))
|
|
return FlashPage[A >> 11][A];
|
|
}
|
|
}
|
|
return Page[A >> 11][A];
|
|
}
|
|
|
|
static void UNROM512LatchPower(void) {
|
|
latche = latcheinit;
|
|
WHSync();
|
|
SetReadHandler(0x8000, 0xFFFF, UNROM512LatchRead);
|
|
if(!flash_save)
|
|
SetWriteHandler(0x8000, 0xFFFF, UNROM512HLatchWrite);
|
|
else
|
|
{
|
|
SetWriteHandler(0x8000,0xBFFF,UNROM512LLatchWrite);
|
|
SetWriteHandler(0xC000,0xFFFF,UNROM512HLatchWrite);
|
|
}
|
|
}
|
|
|
|
static void UNROM512LatchClose(void) {
|
|
if(flash_write_count)
|
|
FCEU_gfree(flash_write_count);
|
|
if(flashdata)
|
|
FCEU_gfree(flashdata);
|
|
flash_write_count = NULL;
|
|
flashdata = NULL;
|
|
}
|
|
|
|
|
|
static void UNROM512LSync() {
|
|
int erase_a[5]={0x9555,0xAAAA,0x9555,0x9555,0xAAAA};
|
|
int erase_d[5]={0xAA,0x55,0x80,0xAA,0x55};
|
|
int erase_b[5]={1,0,1,1,0};
|
|
|
|
if(flash_mode==0)
|
|
{
|
|
if((latcha == erase_a[flash_state]) && (latche == erase_d[flash_state]) && (flash_bank == erase_b[flash_state]))
|
|
{
|
|
flash_state++;
|
|
if(flash_state == 5)
|
|
{
|
|
flash_mode=1;
|
|
}
|
|
}
|
|
else if ((flash_state==2)&&(latcha==0x9555)&&(latche==0xA0)&&(flash_bank==1))
|
|
{
|
|
flash_state++;
|
|
flash_mode=2;
|
|
}
|
|
else if ((flash_state==2)&&(latcha==0x9555)&&(latche==0x90)&&(flash_bank==1))
|
|
{
|
|
flash_state=0;
|
|
software_id=true;
|
|
}
|
|
else
|
|
{
|
|
if(latche==0xF0)
|
|
software_id=false;
|
|
flash_state=0;
|
|
}
|
|
}
|
|
else if(flash_mode==1) //Chip Erase or Sector Erase
|
|
{
|
|
if(latche==0x30)
|
|
{
|
|
inc_flash_write_count(flash_bank,latcha);
|
|
memset(&FlashPage[(latcha & 0xF000) >> 11][latcha & 0xF000],0xFF,0x1000);
|
|
}
|
|
else if (latche==0x10)
|
|
{
|
|
for(int i=0;i<(ROM_size*4);i++)
|
|
inc_flash_write_count(i>>2,i<<12);
|
|
memset(flashdata,0xFF,ROM_size*0x4000); //Erasing the rom chip as instructed. Crash rate calulated to be 99.9% :)
|
|
}
|
|
flash_state=0;
|
|
flash_mode=0;
|
|
}
|
|
else if(flash_mode==2) //Byte Program
|
|
{
|
|
if(!GetFlashWriteCount(flash_bank,latcha))
|
|
{
|
|
inc_flash_write_count(flash_bank,latcha);
|
|
memcpy(&FlashPage[(latcha & 0xF000) >> 11][latcha & 0xF000],&Page[(latcha & 0xF000)>>11][latcha & 0xF000],0x1000);
|
|
}
|
|
FlashPage[latcha>>11][latcha]&=latche;
|
|
flash_state=0;
|
|
flash_mode=0;
|
|
}
|
|
}
|
|
|
|
static void UNROM512HSync()
|
|
{
|
|
flash_bank=latche&(ROM_size-1);
|
|
|
|
setprg16(0x8000, flash_bank);
|
|
setprg16(0xc000, ~0);
|
|
setfprg16(0x8000, flash_bank);
|
|
setfprg16(0xC000, ~0);
|
|
setchr8r(0, (latche & chrram_mask) >> 5);
|
|
setmirror(MI_0+(latche>>7));
|
|
}
|
|
|
|
void UNROM512_Init(CartInfo *info) {
|
|
flash_state=0;
|
|
flash_bank=0;
|
|
flash_save=info->battery;
|
|
|
|
if(info->vram_size == 8192)
|
|
chrram_mask = 0;
|
|
else if (info->vram_size == 16384)
|
|
chrram_mask = 0x20;
|
|
else
|
|
chrram_mask = 0x60;
|
|
|
|
SetupCartMirroring(info->mirror,(info->mirror>=MI_0)?0:1,0);
|
|
bus_conflict = !info->battery;
|
|
latcheinit = 0;
|
|
WLSync = UNROM512LSync;
|
|
WHSync = UNROM512HSync;
|
|
info->Power = UNROM512LatchPower;
|
|
info->Close = UNROM512LatchClose;
|
|
GameStateRestore = StateRestore;
|
|
if(flash_save)
|
|
{
|
|
flashdata = (uint8*)FCEU_gmalloc(ROM_size*0x4000);
|
|
flash_write_count = (uint32*)FCEU_gmalloc(ROM_size*4*sizeof(uint32));
|
|
info->SaveGame[0] = (uint8*)flash_write_count;
|
|
info->SaveGame[1] = flashdata;
|
|
info->SaveGameLen[0] = ROM_size*4*sizeof(uint32);
|
|
info->SaveGameLen[1] = ROM_size*0x4000;
|
|
AddExState(flash_write_count,ROM_size*4*sizeof(uint32),0,"FLASH_WRITE_COUNT");
|
|
AddExState(flashdata,ROM_size*0x4000,0,"FLASH_DATA");
|
|
AddExState(&flash_state,1,0,"FLASH_STATE");
|
|
AddExState(&flash_mode,1,0,"FLASH_MODE");
|
|
AddExState(&flash_bank,1,0,"FLASH_BANK");
|
|
AddExState(&latcha,2,0,"LATA");
|
|
}
|
|
AddExState(&latche, 1, 0, "LATC");
|
|
AddExState(&bus_conflict, 1, 0, "BUSC");
|
|
} |