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fceux/boards/90.cpp

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/* FCE Ultra - NES/Famicom Emulator
*
* Copyright notice for this file:
* Copyright (C) 2002 Xodnizel
* Copyright (C) 2005 CaH4e3
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "mapinc.h"
#define DEBUG90
// Mapper 090 is simpliest mapper hardware and have not extended nametable control and latched chr banks in 4k mode
// Mapper 209 much compicated hardware with decribed above features disabled by default and switchable by command
// Mapper 211 the same mapper 209 but with forced nametable control
static int is209;
static int is211;
static uint8 IRQMode; // from $c001
static uint8 IRQPre; // from $c004
static uint8 IRQPreSize; // from $c007
static uint8 IRQCount; // from $c005
static uint8 IRQXOR; // Loaded from $C006
static uint8 IRQa; // $c002, $c003, and $c000
static uint8 mul[2];
static uint8 regie;
static uint8 regie2;
static uint8 tkcom[4];
static uint8 prgb[4];
static uint8 chrlow[8];
static uint8 chrhigh[8];
static uint8 chr[2];
static uint16 names[4];
static uint8 tekker;
static SFORMAT Tek_StateRegs[]={
{&IRQMode, 1, "IRQMODE"},
{&IRQPre, 1, "IRQPRE"},
{&IRQPreSize, 1, "IRQPRESIZE"},
{&IRQCount, 1, "IRQC"},
{&IRQXOR, 1, "IRQXOR"},
{&IRQa, 1, "IRQa"},
{mul, 2, "MUL"},
{&regie, 1, "REGI"},
{tkcom, 4, "TKCO"},
{prgb, 4, "PRGB"},
{chr, 2, "CHRLATCH"},
{chrlow, 4, "CHRL"},
{chrhigh, 8, "CHRH"},
{&names[0], 2|FCEUSTATE_RLSB, "NMS0"},
{&names[1], 2|FCEUSTATE_RLSB, "NMS1"},
{&names[2], 2|FCEUSTATE_RLSB, "NMS2"},
{&names[3], 2|FCEUSTATE_RLSB, "NMS3"},
{&tekker, 1, "TEKR"},
{0}
};
static void mira(void)
{
if((tkcom[0]&0x20&&is209)||is211)
{
int x;
if(tkcom[0]&0x40) // Name tables are ROM-only
{
for(x=0;x<4;x++)
setntamem(CHRptr[0]+(((names[x])&CHRmask1[0])<<10),0,x);
}
else // Name tables can be RAM or ROM.
{
for(x=0;x<4;x++)
{
if((tkcom[1]&0x80)==(names[x]&0x80)) // RAM selected.
setntamem(NTARAM+((names[x]&0x1)<<10),1,x);
else
setntamem(CHRptr[0]+(((names[x])&CHRmask1[0])<<10),0,x);
}
}
}
else
{
switch(tkcom[1]&3)
{
case 0: setmirror(MI_V); break;
case 1: setmirror(MI_H); break;
case 2: setmirror(MI_0); break;
case 3: setmirror(MI_1); break;
}
}
}
static void tekprom(void)
{
uint32 bankmode=((tkcom[3]&6)<<5);
switch(tkcom[0]&7)
{
case 00: if(tkcom[0]&0x80)
setprg8(0x6000,(((prgb[3]<<2)+3)&0x3F)|bankmode);
setprg32(0x8000,0x0F|((tkcom[3]&6)<<3));
break;
case 01: if(tkcom[0]&0x80)
setprg8(0x6000,(((prgb[3]<<1)+1)&0x3F)|bankmode);
setprg16(0x8000,(prgb[1]&0x1F)|((tkcom[3]&6)<<4));
setprg16(0xC000,0x1F|((tkcom[3]&6)<<4));
break;
case 03: // bit reversion
case 02: if(tkcom[0]&0x80)
setprg8(0x6000,(prgb[3]&0x3F)|bankmode);
setprg8(0x8000,(prgb[0]&0x3F)|bankmode);
setprg8(0xa000,(prgb[1]&0x3F)|bankmode);
setprg8(0xc000,(prgb[2]&0x3F)|bankmode);
setprg8(0xe000,0x3F|bankmode);
break;
case 04: if(tkcom[0]&0x80)
setprg8(0x6000,(((prgb[3]<<2)+3)&0x3F)|bankmode);
setprg32(0x8000,(prgb[3]&0x0F)|((tkcom[3]&6)<<3));
break;
case 05: if(tkcom[0]&0x80)
setprg8(0x6000,(((prgb[3]<<1)+1)&0x3F)|bankmode);
setprg16(0x8000,(prgb[1]&0x1F)|((tkcom[3]&6)<<4));
setprg16(0xC000,(prgb[3]&0x1F)|((tkcom[3]&6)<<4));
break;
case 07: // bit reversion
case 06: if(tkcom[0]&0x80)
setprg8(0x6000,(prgb[3]&0x3F)|bankmode);
setprg8(0x8000,(prgb[0]&0x3F)|bankmode);
setprg8(0xa000,(prgb[1]&0x3F)|bankmode);
setprg8(0xc000,(prgb[2]&0x3F)|bankmode);
setprg8(0xe000,(prgb[3]&0x3F)|bankmode);
break;
}
}
static void tekvrom(void)
{
int x, bank=0, mask=0xFFFF;
if(!(tkcom[3]&0x20))
{
bank=(tkcom[3]&1)|((tkcom[3]&0x18)>>2);
switch (tkcom[0]&0x18)
{
case 0x00: bank<<=5; mask=0x1F; break;
case 0x08: bank<<=6; mask=0x3F; break;
case 0x10: bank<<=7; mask=0x7F; break;
case 0x18: bank<<=8; mask=0xFF; break;
}
}
switch(tkcom[0]&0x18)
{
case 0x00: // 8KB
setchr8(((chrlow[0]|(chrhigh[0]<<8))&mask)|bank);
break;
case 0x08: // 4KB
// for(x=0;x<8;x+=4)
// setchr4(x<<10,((chrlow[x]|(chrhigh[x]<<8))&mask)|bank);
setchr4(0x0000,((chrlow[chr[0]]|(chrhigh[chr[0]]<<8))&mask)|bank);
setchr4(0x1000,((chrlow[chr[1]]|(chrhigh[chr[1]]<<8))&mask)|bank);
break;
case 0x10: // 2KB
for(x=0;x<8;x+=2)
setchr2(x<<10,((chrlow[x]|(chrhigh[x]<<8))&mask)|bank);
break;
case 0x18: // 1KB
for(x=0;x<8;x++)
setchr1(x<<10,((chrlow[x]|(chrhigh[x]<<8))&mask)|bank);
break;
}
}
static DECLFW(M90TekWrite)
{
FCEU_printf("bs %04x %02x\n",A,V);
switch(A&0x5805)
{
case 0x5800: mul[0]=V; break;
case 0x5801: mul[1]=V; break;
case 0x5803: regie=V; break;
// case 0x5803: regie2=V; break;
// default: regie=V; break;
}
}
static DECLFR(M90TekRead)
{
switch(A&0x5805)
{
case 0x5000: return tekker;
case 0x5800: return (mul[0]*mul[1]);
case 0x5801: return((mul[0]*mul[1])>>8);
case 0x5803: return (regie);
// case 0x5804: return (regie2);
}
return(0xff);
}
static DECLFW(M90PRGWrite)
{
FCEU_printf("bs %04x %02x\n",A,V);
prgb[A&3]=V;
tekprom();
}
static DECLFW(M90CHRlowWrite)
{
FCEU_printf("bs %04x %02x\n",A,V);
chrlow[A&7]=V;
tekvrom();
}
static DECLFW(M90CHRhiWrite)
{
FCEU_printf("bs %04x %02x\n",A,V);
chrhigh[A&7]=V;
tekvrom();
}
static DECLFW(M90NTWrite)
{
FCEU_printf("bs %04x %02x\n",A,V);
if(A&4)
{
names[A&3]&=0x00FF;
names[A&3]|=V<<8;
}
else
{
names[A&3]&=0xFF00;
names[A&3]|=V;
}
mira();
}
static DECLFW(M90IRQWrite)
{
FCEU_printf("bs %04x %02x\n",A,V);
switch(A&7)
{
case 00: //FCEU_printf("%s IRQ (C000)\n",V&1?"Enable":"Disable");
IRQa=V&1;if(!(V&1)) X6502_IRQEnd(FCEU_IQEXT);break;
case 02: //FCEU_printf("Disable IRQ (C002) scanline=%d\n", scanline);
IRQa=0;X6502_IRQEnd(FCEU_IQEXT);break;
case 03: //FCEU_printf("Enable IRQ (C003) scanline=%d\n", scanline);
IRQa=1;break;
case 01: IRQMode=V;
// FCEU_printf("IRQ Count method: ");
// switch (IRQMode&3)
// {
// case 00: FCEU_printf("M2 cycles\n");break;
// case 01: FCEU_printf("PPU A12 toggles\n");break;
// case 02: FCEU_printf("PPU reads\n");break;
// case 03: FCEU_printf("Writes to CPU space\n");break;
// }
// FCEU_printf("Counter prescaler size: %s\n",(IRQMode&4)?"3 bits":"8 bits");
// FCEU_printf("Counter prescaler size adjust: %s\n",(IRQMode&8)?"Used C007":"Normal Operation");
// if((IRQMode>>6)==2) FCEU_printf("Counter Down\n");
// else if((IRQMode>>6)==1) FCEU_printf("Counter Up\n");
// else FCEU_printf("Counter Stopped\n");
break;
case 04: //FCEU_printf("Pre Counter Loaded and Xored wiht C006: %d\n",V^IRQXOR);
IRQPre=V^IRQXOR;break;
case 05: //FCEU_printf("Main Counter Loaded and Xored wiht C006: %d\n",V^IRQXOR);
IRQCount=V^IRQXOR;break;
case 06: //FCEU_printf("Xor Value: %d\n",V);
IRQXOR=V;break;
case 07: //if(!(IRQMode&8)) FCEU_printf("C001 is clear, no effect applied\n");
// else if(V==0xFF) FCEU_printf("Prescaler is changed for 12bits\n");
// else FCEU_printf("Counter Stopped\n");
IRQPreSize=V;break;
}
}
static DECLFW(M90ModeWrite)
{
FCEU_printf("bs %04x %02x\n",A,V);
tkcom[A&3]=V;
tekprom();
tekvrom();
mira();
#ifdef DEBUG90
switch (A&3)
{
case 00: FCEU_printf("Main Control Register:\n");
FCEU_printf(" PGR Banking mode: %d\n",V&7);
FCEU_printf(" CHR Banking mode: %d\n",(V>>3)&3);
FCEU_printf(" 6000-7FFF addresses mapping: %s\n",(V&0x80)?"Yes":"No");
FCEU_printf(" Nametable control: %s\n",(V&0x20)?"Enabled":"Disabled");
if(V&0x20)
FCEU_printf(" Nametable can be: %s\n",(V&0x40)?"ROM Only":"RAM or ROM");
break;
case 01: FCEU_printf("Mirroring mode: ");
switch (V&3)
{
case 0: FCEU_printf("Vertical\n");break;
case 1: FCEU_printf("Horizontal\n");break;
case 2: FCEU_printf("Nametable 0 only\n");break;
case 3: FCEU_printf("Nametable 1 only\n");break;
}
FCEU_printf("Mirroring flag: %s\n",(V&0x80)?"On":"Off");
break;
case 02: if((((tkcom[0])>>5)&3)==1)
FCEU_printf("Nametable ROM/RAM select mode: %d\n",V>>7);
break;
case 03:
FCEU_printf("CHR Banking mode: %s\n",(V&0x20)?"Entire CHR ROM":"256Kb Switching mode");
if(!(V&0x20)) FCEU_printf("256K CHR bank number: %02x\n",(V&1)|((V&0x18)>>2));
FCEU_printf("512K PRG bank number: %d\n",(V&6)>>1);
FCEU_printf("CHR Bank mirroring: %s\n",(V&0x80)?"Swapped":"Normal operate");
}
#endif
}
static DECLFW(M90DummyWrite)
{
FCEU_printf("bs %04x %02x\n",A,V);
}
static void CCL(void)
{
if((IRQMode>>6) == 1) // Count Up
{
IRQCount++;
if((IRQCount == 0) && IRQa)
{
X6502_IRQBegin(FCEU_IQEXT);
}
}
else if((IRQMode>>6) == 2) // Count down
{
IRQCount--;
if((IRQCount == 0xFF) && IRQa)
{
X6502_IRQBegin(FCEU_IQEXT);
}
}
}
static void ClockCounter(void)
{
uint8 premask;
if(IRQMode & 0x4)
premask = 0x7;
else
premask = 0xFF;
if((IRQMode>>6) == 1) // Count up
{
IRQPre++;
if((IRQPre & premask) == 0) CCL();
}
else if((IRQMode>>6) == 2) // Count down
{
IRQPre--;
if((IRQPre & premask) == premask) CCL();
}
}
void FP_FASTAPASS(1) CPUWrap(int a)
{
int x;
if((IRQMode&3)==0) for(x=0;x<a;x++) ClockCounter();
}
static void SLWrap(void)
{
int x;
if((IRQMode&3)==1) for(x=0;x<8;x++) ClockCounter();
}
static uint32 lastread;
static void FP_FASTAPASS(1) M90PPU(uint32 A)
{
if((IRQMode&3)==2)
{
if(lastread!=A)
{
ClockCounter();
ClockCounter();
}
lastread=A;
}
if(is209)
{
uint8 l,h;
h=A>>8;
if(h<0x20&&((h&0x0F)==0xF))
{
l=A&0xF0;
if(l==0xD0)
{
chr[(h&0x10)>>4]=((h&0x10)>>2);
tekvrom();
}
else if(l==0xE0)
{
chr[(h&0x10)>>4]=((h&0x10)>>2)|2;
tekvrom();
}
}
}
else
{
chr[0]=0;
chr[1]=4;
}
}
static void togglie()
{
tekker+=0x40;
tekker&=0xC0;
FCEU_printf("tekker=%02x\n",tekker);
memset(tkcom,0x00,sizeof(tkcom));
memset(prgb,0xff,sizeof(prgb));
tekprom();
tekvrom();
}
static void M90Restore(int version)
{
tekprom();
tekvrom();
mira();
}
static void M90Power(void)
{
SetWriteHandler(0x5000,0x5fff,M90TekWrite);
SetWriteHandler(0x8000,0x8ff0,M90PRGWrite);
SetWriteHandler(0x9000,0x9fff,M90CHRlowWrite);
SetWriteHandler(0xA000,0xAfff,M90CHRhiWrite);
SetWriteHandler(0xB000,0xBfff,M90NTWrite);
SetWriteHandler(0xC000,0xCfff,M90IRQWrite);
SetWriteHandler(0xD000,0xD5ff,M90ModeWrite);
SetWriteHandler(0xE000,0xFfff,M90DummyWrite);
SetReadHandler(0x5000,0x5fff,M90TekRead);
SetReadHandler(0x6000,0xffff,CartBR);
mul[0]=mul[1]=regie=0xFF;
memset(tkcom,0x00,sizeof(tkcom));
memset(prgb,0xff,sizeof(prgb));
memset(chrlow,0xff,sizeof(chrlow));
memset(chrhigh,0xff,sizeof(chrhigh));
memset(names,0x00,sizeof(names));
if(is211)
tekker=0xC0;
else
tekker=0x00;
tekprom();
tekvrom();
}
void Mapper90_Init(CartInfo *info)
{
is211=0;
is209=0;
info->Reset=togglie;
info->Power=M90Power;
PPU_hook=M90PPU;
MapIRQHook=CPUWrap;
GameHBIRQHook2=SLWrap;
GameStateRestore=M90Restore;
AddExState(Tek_StateRegs, ~0, 0, 0);
}
void Mapper209_Init(CartInfo *info)
{
is211=0;
is209=1;
info->Reset=togglie;
info->Power=M90Power;
PPU_hook=M90PPU;
MapIRQHook=CPUWrap;
GameHBIRQHook2=SLWrap;
GameStateRestore=M90Restore;
AddExState(Tek_StateRegs, ~0, 0, 0);
}
void Mapper211_Init(CartInfo *info)
{
is211=1;
info->Reset=togglie;
info->Power=M90Power;
PPU_hook=M90PPU;
MapIRQHook=CPUWrap;
GameHBIRQHook2=SLWrap;
GameStateRestore=M90Restore;
AddExState(Tek_StateRegs, ~0, 0, 0);
}
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