1  /*
  2  ** Nofrendo (c) 1998-2000 Matthew Conte (matt@conte.com)
  3  **
  4  **
  5  ** This program is free software; you can redistribute it and/or
  6  ** modify it under the terms of version 2 of the GNU Library General 
  7  ** Public License as published by the Free Software Foundation.
  8  **
  9  ** This program is distributed in the hope that it will be useful, 
 10  ** but WITHOUT ANY WARRANTY; without even the implied warranty of
 11  ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU 
 12  ** Library General Public License for more details.  To obtain a 
 13  ** copy of the GNU Library General Public License, write to the Free 
 14  ** Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 15  **
 16  ** Any permitted reproduction of these routines, in whole or in part,
 17  ** must bear this legend.
 18  **
 19  **
 20  ** map9.c
 21  **
 22  ** mapper 9 interface
 23  ** $Id: map009.c,v 1.2 2001/04/27 14:37:11 neil Exp $
 24  */
 25  
 26  #include <string.h>
 27  #include "noftypes.h"
 28  #include "nes_mmc.h"
 29  #include "nes_ppu.h"
 30  #include "libsnss.h"
 31  
 32  static uint8 latch[2];
 33  static uint8 regs[4];
 34  
 35  /* Used when tile $FD/$FE is accessed */
 36  static void mmc9_latchfunc(uint32 address, uint8 value)
 37  {
 38     if (0xFD == value || 0xFE == value)
 39     {
 40        int reg;
 41  
 42        if (address)
 43        {
 44           latch[1] = value;
 45           reg = 2 + (value - 0xFD);
 46        }
 47        else
 48        {
 49           latch[0] = value;
 50           reg = value - 0xFD;
 51        }
 52  
 53        mmc_bankvrom(4, address, regs[reg]);
 54     }
 55  }
 56  
 57  /* mapper 9: MMC2 */
 58  /* MMC2: Punch-Out! */
 59  static void map9_write(uint32 address, uint8 value)
 60  {
 61     switch ((address & 0xF000) >> 12)
 62     {
 63     case 0xA:
 64        mmc_bankrom(8, 0x8000, value);
 65        break;
 66  
 67     case 0xB:
 68        regs[0] = value;
 69        if (0xFD == latch[0])
 70           mmc_bankvrom(4, 0x0000, value);
 71        break;
 72  
 73     case 0xC:
 74        regs[1] = value;
 75        if (0xFE == latch[0])
 76           mmc_bankvrom(4, 0x0000, value);
 77        break;
 78  
 79     case 0xD:
 80        regs[2] = value;
 81        if (0xFD == latch[1])
 82           mmc_bankvrom(4, 0x1000, value);
 83        break;
 84  
 85     case 0xE:
 86        regs[3] = value;
 87        if (0xFE == latch[1])
 88           mmc_bankvrom(4, 0x1000, value);
 89        break;
 90  
 91     case 0xF:
 92        if (value & 1)
 93           ppu_mirror(0, 0, 1, 1); /* horizontal */
 94        else
 95           ppu_mirror(0, 1, 0, 1); /* vertical */
 96        break;
 97  
 98     default:
 99        break;
100     }
101  }
102  
103  static void map9_init(void)
104  {
105     memset(regs, 0, sizeof(regs));
106  
107     mmc_bankrom(8, 0x8000, 0);
108     mmc_bankrom(8, 0xA000, (mmc_getinfo()->rom_banks * 2) - 3);
109     mmc_bankrom(8, 0xC000, (mmc_getinfo()->rom_banks * 2) - 2);
110     mmc_bankrom(8, 0xE000, (mmc_getinfo()->rom_banks * 2) - 1);
111  
112     latch[0] = 0xFE;
113     latch[1] = 0xFE;
114  
115     ppu_setlatchfunc(mmc9_latchfunc);
116  }
117  
118  static void map9_getstate(SnssMapperBlock *state)
119  {
120     state->extraData.mapper9.latch[0] = latch[0];
121     state->extraData.mapper9.latch[1] = latch[1];
122     state->extraData.mapper9.lastB000Write = regs[0];
123     state->extraData.mapper9.lastC000Write = regs[1];
124     state->extraData.mapper9.lastD000Write = regs[2];
125     state->extraData.mapper9.lastE000Write = regs[3];
126  }
127  
128  static void map9_setstate(SnssMapperBlock *state)
129  {
130     latch[0] = state->extraData.mapper9.latch[0];
131     latch[1] = state->extraData.mapper9.latch[1];
132     regs[0] = state->extraData.mapper9.lastB000Write;
133     regs[1] = state->extraData.mapper9.lastC000Write;
134     regs[2] = state->extraData.mapper9.lastD000Write;
135     regs[3] = state->extraData.mapper9.lastE000Write;
136  }
137  
138  static map_memwrite map9_memwrite[] =
139  {
140     { 0x8000, 0xFFFF, map9_write },
141     {     -1,     -1, NULL }
142  };
143  
144  const mapintf_t map9_intf =
145  {
146     9, /* mapper number */
147     "MMC2", /* mapper name */
148     map9_init, /* init routine */
149     NULL, /* vblank callback */
150     NULL, /* hblank callback */
151     map9_getstate, /* get state (snss) */
152     map9_setstate, /* set state (snss) */
153     NULL, /* memory read structure */
154     map9_memwrite, /* memory write structure */
155     NULL /* external sound device */
156  };
157  
158  /*
159  ** $Log: map009.c,v $
160  ** Revision 1.2  2001/04/27 14:37:11  neil
161  ** wheeee
162  **
163  ** Revision 1.1  2001/04/27 12:54:40  neil
164  ** blah
165  **
166  ** Revision 1.1.1.1  2001/04/27 07:03:54  neil
167  ** initial
168  **
169  ** Revision 1.1  2000/10/24 12:19:33  matt
170  ** changed directory structure
171  **
172  ** Revision 1.9  2000/10/22 19:17:46  matt
173  ** mapper cleanups galore
174  **
175  ** Revision 1.8  2000/10/22 15:03:14  matt
176  ** simplified mirroring
177  **
178  ** Revision 1.7  2000/10/21 19:33:38  matt
179  ** many more cleanups
180  **
181  ** Revision 1.6  2000/07/17 05:11:35  matt
182  ** minor update from making PPU code less filthy
183  **
184  ** Revision 1.5  2000/07/15 23:52:19  matt
185  ** rounded out a bunch more mapper interfaces
186  **
187  ** Revision 1.4  2000/07/10 05:29:03  matt
188  ** cleaned up some mirroring issues
189  **
190  ** Revision 1.3  2000/07/06 02:48:43  matt
191  ** clearly labelled structure members
192  **
193  ** Revision 1.2  2000/07/05 22:50:33  matt
194  ** fixed punchout -- works 100% now
195  **
196  ** Revision 1.1  2000/07/05 05:05:18  matt
197  ** initial revision
198  **
199  */