mmc4.c 3.0 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141
  1. /*
  2. * MMC4 Mapper - The peTI-NESulator Project
  3. * mmc4.h
  4. *
  5. * Created by Manoël Trapier.
  6. * Copyright (c) 2002-2019 986-Studio.
  7. *
  8. */
  9. #include "mmc4.h"
  10. uint8_t mmc4_RegA;
  11. uint8_t mmc4_RegB;
  12. uint8_t mmc4_RegC;
  13. uint8_t mmc4_RegD;
  14. uint8_t mmc4_RegE;
  15. uint8_t mmc4_RegF;
  16. #ifdef DEBUG
  17. #define LOG(s) printf s
  18. #else
  19. #define LOG(s) { }
  20. #endif
  21. /* MAPPER WARNING: This mapper need to attach to the PPU memory... Need more work on this parts.. */
  22. void mmc4_MapperWriteRegA(register uint8_t Addr, register uint8_t Value)
  23. {
  24. LOG(("%s(%02X, %02X)\n", __func__, Addr, Value));
  25. mmc4_RegA = Value;
  26. set_prom_bank_16k(0x8000, Value & 0x0F);
  27. }
  28. void mmc4_MapperWriteRegB(register uint8_t Addr, register uint8_t Value)
  29. {
  30. LOG(("%s(%02X, %02X)\n", __func__, Addr, Value));
  31. mmc4_RegB = Value;
  32. set_vrom_bank_4k(0x0000, Value & 0x1F);
  33. }
  34. void mmc4_MapperWriteRegC(register uint8_t Addr, register uint8_t Value)
  35. {
  36. LOG(("%s(%02X, %02X)\n", __func__, Addr, Value));
  37. mmc4_RegC = Value;
  38. set_vrom_bank_4k(0x0000, Value & 0x1F);
  39. }
  40. void mmc4_MapperWriteRegD(register uint8_t Addr, register uint8_t Value)
  41. {
  42. LOG(("%s(%02X, %02X)\n", __func__, Addr, Value));
  43. mmc4_RegD = Value;
  44. set_vrom_bank_4k(0x1000, Value & 0x1F);
  45. }
  46. void mmc4_MapperWriteRegE(register uint8_t Addr, register uint8_t Value)
  47. {
  48. LOG(("%s(%02X, %02X)\n", __func__, Addr, Value));
  49. mmc4_RegE = Value;
  50. set_vrom_bank_4k(0x1000, Value & 0x1F);
  51. }
  52. void mmc4_MapperWriteRegF(register uint8_t Addr, register uint8_t Value)
  53. {
  54. LOG(("%s(%02X, %02X)\n", __func__, Addr, Value));
  55. mmc4_RegF = Value;
  56. if (Value & 0x01)
  57. {
  58. ppu_setMirroring(PPU_MIRROR_HORIZTAL);
  59. }
  60. else
  61. {
  62. ppu_setMirroring(PPU_MIRROR_VERTICAL);
  63. }
  64. }
  65. void mmc4_MapperDump(FILE *fp)
  66. {
  67. }
  68. int mmc4_InitMapper(NesCart *cart)
  69. {
  70. int i;
  71. set_prom_bank_16k(0x8000, 0);
  72. set_prom_bank_16k(0xC000, GETLAST16KBANK(cart));
  73. if (cart->VROMSize > 0)
  74. {
  75. set_vrom_bank_8k(0x0000, 0);
  76. }
  77. /* Mapper should register itself for write hook */
  78. for (i = 0xA0 ; i < 0xB0 ; i++)
  79. {
  80. set_page_wr_hook(i, mmc4_MapperWriteRegA);
  81. set_page_writeable(i, true);
  82. }
  83. for (i = 0xB0 ; i < 0xC0 ; i++)
  84. {
  85. set_page_wr_hook(i, mmc4_MapperWriteRegB);
  86. set_page_writeable(i, true);
  87. }
  88. for (i = 0xC0 ; i < 0xD0 ; i++)
  89. {
  90. set_page_wr_hook(i, mmc4_MapperWriteRegC);
  91. set_page_writeable(i, true);
  92. }
  93. for (i = 0xD0 ; i < 0xE0 ; i++)
  94. {
  95. set_page_wr_hook(i, mmc4_MapperWriteRegD);
  96. set_page_writeable(i, true);
  97. }
  98. for (i = 0xE0 ; i < 0xF0 ; i++)
  99. {
  100. set_page_wr_hook(i, mmc4_MapperWriteRegE);
  101. set_page_writeable(i, true);
  102. }
  103. for (i = 0xF0 ; i < 0x100 ; i++)
  104. {
  105. set_page_wr_hook(i, mmc4_MapperWriteRegF);
  106. set_page_writeable(i, true);
  107. }
  108. for (i = 0x60 ; i < 0x80 ; i++)
  109. {
  110. set_page_writeable(i, true);
  111. set_page_readable(i, true);
  112. }
  113. //ppu_setScreenMode(PPU_SCMODE_NORMAL);
  114. //ppu_setMirroring(PPU_MIRROR_HORIZTAL);
  115. return 0;
  116. }