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MCUME/MCUME_teensy/teensynofrendo/mapvrc.c

453 wiersze
10 KiB
C
Executable File
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/*
** Nofrendo (c) 1998-2000 Matthew Conte (matt@conte.com)
**
**
** This program is free software; you can redistribute it and/or
** modify it under the terms of version 2 of the GNU Library General
** Public License as published by the Free Software Foundation.
**
** 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
** Library General Public License for more details. To obtain a
** copy of the GNU Library General Public License, write to the Free
** Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
**
** Any permitted reproduction of these routines, in whole or in part,
** must bear this legend.
**
**
** map_vrc.c
**
** VRC mapper interface
** $Id: mapvrc.c,v 1.2 2001/04/27 14:37:11 neil Exp $
*/
#include "noftypes.h"
#include "nes_mmc.h"
#include "nes.h"
#include "log.h"
#define VRC_VBANK(bank, value, high) \
{ \
if ((high)) \
highnybbles[(bank)] = (value) & 0x0F; \
else \
lownybbles[(bank)] = (value) & 0x0F; \
mmc_bankvrom(1, (bank) << 10, (highnybbles[(bank)] << 4)+lownybbles[(bank)]); \
}
static struct
{
int counter, enabled;
int latch, wait_state;
} irq;
static int select_c000 = 0;
static uint8 lownybbles[8];
static uint8 highnybbles[8];
static void vrc_init(void)
{
irq.counter = irq.enabled = 0;
irq.latch = irq.wait_state = 0;
}
static void map21_write(uint32 address, uint8 value)
{
switch (address)
{
case 0x8000:
if (select_c000)
mmc_bankrom(8, 0xC000,value);
else
mmc_bankrom(8, 0x8000,value);
break;
case 0x9000:
switch (value & 3)
{
case 0:
ppu_mirror(0, 1, 0, 1); /* vertical */
break;
case 1:
ppu_mirror(0, 0, 1, 1); /* horizontal */
break;
case 2:
ppu_mirror(0, 0, 0, 0);
break;
case 3:
ppu_mirror(1, 1, 1, 1);
break;
default:
break;
}
break;
case 0x9002: select_c000=(value&0x02)>>1; break;
case 0xA000: mmc_bankrom(8, 0xA000,value); break;
case 0xB000: VRC_VBANK(0,value,0); break;
case 0xB002:
case 0xB040: VRC_VBANK(0,value,1); break;
case 0xB001:
case 0xB004:
case 0xB080: VRC_VBANK(1,value,0); break;
case 0xB003:
case 0xB006:
case 0xB0C0: VRC_VBANK(1,value,1); break;
case 0xC000: VRC_VBANK(2,value,0); break;
case 0xC002:
case 0xC040: VRC_VBANK(2,value,1); break;
case 0xC001:
case 0xC004:
case 0xC080: VRC_VBANK(3,value,0); break;
case 0xC003:
case 0xC006:
case 0xC0C0: VRC_VBANK(3,value,1); break;
case 0xD000: VRC_VBANK(4,value,0); break;
case 0xD002:
case 0xD040: VRC_VBANK(4,value,1); break;
case 0xD001:
case 0xD004:
case 0xD080: VRC_VBANK(5,value,0); break;
case 0xD003:
case 0xD006:
case 0xD0C0: VRC_VBANK(5,value,1); break;
case 0xE000: VRC_VBANK(6,value,0); break;
case 0xE002:
case 0xE040: VRC_VBANK(6,value,1); break;
case 0xE001:
case 0xE004:
case 0xE080: VRC_VBANK(7,value,0); break;
case 0xE003:
case 0xE006:
case 0xE0C0: VRC_VBANK(7,value,1); break;
case 0xF000:
irq.latch &= 0xF0;
irq.latch |= (value & 0x0F);
break;
case 0xF002:
case 0xF040:
irq.latch &= 0x0F;
irq.latch |= ((value & 0x0F) << 4);
break;
case 0xF004:
case 0xF001:
case 0xF080:
irq.enabled = (value >> 1) & 0x01;
irq.wait_state = value & 0x01;
irq.counter = irq.latch;
break;
case 0xF006:
case 0xF003:
case 0xF0C0:
irq.enabled = irq.wait_state;
break;
default:
#ifdef NOFRENDO_DEBUG
log_printf("wrote $%02X to $%04X", value, address);
#endif
break;
}
}
static void map22_write(uint32 address, uint8 value)
{
int reg = address >> 12;
switch (reg)
{
case 0x8:
mmc_bankrom(8, 0x8000, value);
break;
case 0xA:
mmc_bankrom(8, 0xA000, value);
break;
case 0x9:
switch (value & 3)
{
case 0:
ppu_mirror(0, 1, 0, 1); /* vertical */
break;
case 1:
ppu_mirror(0, 0, 1, 1); /* horizontal */
break;
case 2:
ppu_mirror(1, 1, 1, 1);
break;
case 3:
ppu_mirror(0, 0, 0, 0);
break;
}
break;
case 0xB:
case 0xC:
case 0xD:
case 0xE:
{
int loc = (((reg - 0xB) << 1) + (address & 1)) << 10;
mmc_bankvrom(1, loc, value >> 1);
}
break;
default:
break;
}
}
static void map23_write(uint32 address, uint8 value)
{
switch (address)
{
case 0x8000:
case 0x8FFF:
mmc_bankrom(8, 0x8000, value);
break;
case 0xA000:
case 0xAFFF:
mmc_bankrom(8, 0xA000, value);
break;
case 0x9000:
case 0x9004:
case 0x9008:
switch(value & 3)
{
case 0:
ppu_mirror(0, 1, 0, 1); /* vertical */
break;
case 1:
ppu_mirror(0, 0, 1, 1); /* horizontal */
break;
case 2:
ppu_mirror(0, 0, 0, 0);
break;
case 3:
ppu_mirror(1, 1, 1, 1);
break;
}
break;
case 0xB000: VRC_VBANK(0,value,0); break;
case 0xB001:
case 0xB004: VRC_VBANK(0,value,1); break;
case 0xB002:
case 0xB008: VRC_VBANK(1,value,0); break;
case 0xB003:
case 0xB00C: VRC_VBANK(1,value,1); break;
case 0xC000: VRC_VBANK(2,value,0); break;
case 0xC001:
case 0xC004: VRC_VBANK(2,value,1); break;
case 0xC002:
case 0xC008: VRC_VBANK(3,value,0); break;
case 0xC003:
case 0xC00C: VRC_VBANK(3,value,1); break;
case 0xD000: VRC_VBANK(4,value,0); break;
case 0xD001:
case 0xD004: VRC_VBANK(4,value,1); break;
case 0xD002:
case 0xD008: VRC_VBANK(5,value,0); break;
case 0xD003:
case 0xD00C: VRC_VBANK(5,value,1); break;
case 0xE000: VRC_VBANK(6,value,0); break;
case 0xE001:
case 0xE004: VRC_VBANK(6,value,1); break;
case 0xE002:
case 0xE008: VRC_VBANK(7,value,0); break;
case 0xE003:
case 0xE00C: VRC_VBANK(7,value,1); break;
case 0xF000:
irq.latch &= 0xF0;
irq.latch |= (value & 0x0F);
break;
case 0xF004:
irq.latch &= 0x0F;
irq.latch |= ((value & 0x0F) << 4);
break;
case 0xF008:
irq.enabled = (value >> 1) & 0x01;
irq.wait_state = value & 0x01;
irq.counter = irq.latch;
break;
case 0xF00C:
irq.enabled = irq.wait_state;
break;
default:
#ifdef NOFRENDO_DEBUG
log_printf("wrote $%02X to $%04X",value,address);
#endif
break;
}
}
static void vrc_hblank(int vblank)
{
UNUSED(vblank);
if (irq.enabled)
{
if (256 == ++irq.counter)
{
irq.counter = irq.latch;
nes_irq();
//irq.enabled = false;
irq.enabled = irq.wait_state;
}
}
}
static map_memwrite map21_memwrite[] =
{
{ 0x8000, 0xFFFF, map21_write },
{ -1, -1, NULL }
};
static map_memwrite map22_memwrite[] =
{
{ 0x8000, 0xFFFF, map22_write },
{ -1, -1, NULL }
};
static map_memwrite map23_memwrite[] =
{
{ 0x8000, 0xFFFF, map23_write },
{ -1, -1, NULL }
};
static void map21_getstate(SnssMapperBlock *state)
{
state->extraData.mapper21.irqCounter = irq.counter;
state->extraData.mapper21.irqCounterEnabled = irq.enabled;
}
static void map21_setstate(SnssMapperBlock *state)
{
irq.counter = state->extraData.mapper21.irqCounter;
irq.enabled = state->extraData.mapper21.irqCounterEnabled;
}
const mapintf_t map21_intf =
{
21, /* mapper number */
"Konami VRC4 A", /* mapper name */
vrc_init, /* init routine */
NULL, /* vblank callback */
vrc_hblank, /* hblank callback */
map21_getstate, /* get state (snss) */
map21_setstate, /* set state (snss) */
NULL, /* memory read structure */
map21_memwrite, /* memory write structure */
NULL /* external sound device */
};
const mapintf_t map22_intf =
{
22, /* mapper number */
"Konami VRC2 A", /* mapper name */
vrc_init, /* init routine */
NULL, /* vblank callback */
NULL, /* hblank callback */
NULL, /* get state (snss) */
NULL, /* set state (snss) */
NULL, /* memory read structure */
map22_memwrite, /* memory write structure */
NULL /* external sound device */
};
const mapintf_t map23_intf =
{
23, /* mapper number */
"Konami VRC2 B", /* mapper name */
vrc_init, /* init routine */
NULL, /* vblank callback */
vrc_hblank, /* hblank callback */
NULL, /* get state (snss) */
NULL, /* set state (snss) */
NULL, /* memory read structure */
map23_memwrite, /* memory write structure */
NULL /* external sound device */
};
const mapintf_t map25_intf =
{
25, /* mapper number */
"Konami VRC4 B", /* mapper name */
NULL, /* init routine */
NULL, /* vblank callback */
vrc_hblank, /* hblank callback */
NULL, /* get state (snss) */
NULL, /* set state (snss) */
NULL, /* memory read structure */
map21_memwrite, /* memory write structure */
NULL /* external sound device */
};
/*
** $Log: mapvrc.c,v $
** Revision 1.2 2001/04/27 14:37:11 neil
** wheeee
**
** Revision 1.1 2001/04/27 12:54:40 neil
** blah
**
** Revision 1.1.1.1 2001/04/27 07:03:54 neil
** initial
**
** Revision 1.1 2000/10/24 12:19:33 matt
** changed directory structure
**
** Revision 1.10 2000/10/22 19:17:46 matt
** mapper cleanups galore
**
** Revision 1.9 2000/10/22 15:03:14 matt
** simplified mirroring
**
** Revision 1.8 2000/10/21 19:33:38 matt
** many more cleanups
**
** Revision 1.7 2000/10/10 13:58:17 matt
** stroustrup squeezing his way in the door
**
** Revision 1.6 2000/08/16 02:50:11 matt
** random mapper cleanups
**
** Revision 1.5 2000/07/15 23:52:20 matt
** rounded out a bunch more mapper interfaces
**
** Revision 1.4 2000/07/10 13:51:25 matt
** using generic nes_irq() routine now
**
** Revision 1.3 2000/07/10 05:29:03 matt
** cleaned up some mirroring issues
**
** Revision 1.2 2000/07/06 02:48:43 matt
** clearly labelled structure members
**
** Revision 1.1 2000/07/06 01:01:56 matt
** initial revision
**
*/
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