146 lines
6.4 KiB
C
146 lines
6.4 KiB
C
#include <stdbool.h>
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#include <stdlib.h>
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#include <string.h>
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#include "gb.h"
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const GB_cartridge_t GB_cart_defs[256] = {
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// From http://gbdev.gg8.se/wiki/articles/The_Cartridge_Header#0147_-_Cartridge_Type
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/* MBC SUBTYPE RAM BAT. RTC RUMB. */
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{ GB_NO_MBC, GB_STANDARD_MBC, false, false, false, false}, // 00h ROM ONLY
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{ GB_MBC1 , GB_STANDARD_MBC, false, false, false, false}, // 01h MBC1
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{ GB_MBC1 , GB_STANDARD_MBC, true , false, false, false}, // 02h MBC1+RAM
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{ GB_MBC1 , GB_STANDARD_MBC, true , true , false, false}, // 03h MBC1+RAM+BATTERY
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[5] =
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{ GB_MBC2 , GB_STANDARD_MBC, true , false, false, false}, // 05h MBC2
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{ GB_MBC2 , GB_STANDARD_MBC, true , true , false, false}, // 06h MBC2+BATTERY
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[8] =
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{ GB_NO_MBC, GB_STANDARD_MBC, true , false, false, false}, // 08h ROM+RAM
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{ GB_NO_MBC, GB_STANDARD_MBC, true , true , false, false}, // 09h ROM+RAM+BATTERY
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[0xB] =
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/* Todo: Not supported yet */
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{ GB_NO_MBC, GB_STANDARD_MBC, false, false, false, false}, // 0Bh MMM01
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{ GB_NO_MBC, GB_STANDARD_MBC, false, false, false, false}, // 0Ch MMM01+RAM
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{ GB_NO_MBC, GB_STANDARD_MBC, false, false, false, false}, // 0Dh MMM01+RAM+BATTERY
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[0xF] =
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{ GB_MBC3 , GB_STANDARD_MBC, false, true, true , false}, // 0Fh MBC3+TIMER+BATTERY
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{ GB_MBC3 , GB_STANDARD_MBC, true , true, true , false}, // 10h MBC3+TIMER+RAM+BATTERY
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{ GB_MBC3 , GB_STANDARD_MBC, false, false, false, false}, // 11h MBC3
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{ GB_MBC3 , GB_STANDARD_MBC, true , false, false, false}, // 12h MBC3+RAM
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{ GB_MBC3 , GB_STANDARD_MBC, true , true , false, false}, // 13h MBC3+RAM+BATTERY
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[0x19] =
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{ GB_MBC5 , GB_STANDARD_MBC, false, false, false, false}, // 19h MBC5
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{ GB_MBC5 , GB_STANDARD_MBC, true , false, false, false}, // 1Ah MBC5+RAM
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{ GB_MBC5 , GB_STANDARD_MBC, true , true , false, false}, // 1Bh MBC5+RAM+BATTERY
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/* Todo: Rumble supported yet */
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{ GB_MBC5 , GB_STANDARD_MBC, false, false, false, true }, // 1Ch MBC5+RUMBLE
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{ GB_MBC5 , GB_STANDARD_MBC, true , false, false, true }, // 1Dh MBC5+RUMBLE+RAM
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{ GB_MBC5 , GB_STANDARD_MBC, true , true , false, true }, // 1Eh MBC5+RUMBLE+RAM+BATTERY
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[0xFC] =
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{ GB_MBC5 , GB_CAMERA , true , true , false, false}, // FCh POCKET CAMERA
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{ GB_NO_MBC, GB_STANDARD_MBC, false, false, false, false}, // FDh BANDAI TAMA5 (Todo: Not supported)
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{ GB_HUC3 , GB_STANDARD_MBC, true , true , false, false}, // FEh HuC3 (Todo: Mapper support only)
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{ GB_HUC1 , GB_STANDARD_MBC, true , true , false, false}, // FFh HuC1+RAM+BATTERY (Todo: No IR bindings)
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};
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void GB_update_mbc_mappings(GB_gameboy_t *gb)
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{
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switch (gb->cartridge_type->mbc_type) {
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case GB_NO_MBC: return;
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case GB_MBC1:
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/* Todo: some obscure behaviors of MBC1 are not supported. See http://forums.nesdev.com/viewtopic.php?f=20&t=14099 */
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if (gb->mbc1.mode == 0) {
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switch (gb->mbc1_wiring) {
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case GB_STANDARD_MBC1_WIRING:
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gb->mbc_rom_bank = gb->mbc1.bank_low | (gb->mbc1.bank_high << 5);
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gb->mbc_ram_bank = 0;
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break;
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case GB_MBC1M_WIRING:
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gb->mbc_rom_bank = (gb->mbc1.bank_low & 0xF) | (gb->mbc1.bank_high << 4);
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gb->mbc_ram_bank = 0;
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gb->mbc_rom0_bank = 0;
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}
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}
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else {
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switch (gb->mbc1_wiring) {
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case GB_STANDARD_MBC1_WIRING:
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gb->mbc_rom_bank = gb->mbc1.bank_low;
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gb->mbc_ram_bank = gb->mbc1.bank_high;
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break;
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case GB_MBC1M_WIRING:
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gb->mbc_rom_bank = (gb->mbc1.bank_low & 0xF) | (gb->mbc1.bank_high << 4);
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gb->mbc_rom0_bank = gb->mbc1.bank_high << 4;
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gb->mbc_ram_bank = 0;
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}
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}
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break;
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case GB_MBC2:
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gb->mbc_rom_bank = gb->mbc2.rom_bank;
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break;
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case GB_MBC3:
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gb->mbc_rom_bank = gb->mbc3.rom_bank;
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gb->mbc_ram_bank = gb->mbc3.ram_bank;
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break;
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case GB_MBC5:
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gb->mbc_rom_bank = gb->mbc5.rom_bank_low | (gb->mbc5.rom_bank_high << 8);
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gb->mbc_ram_bank = gb->mbc5.ram_bank;
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break;
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case GB_HUC1:
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if (gb->huc1.mode == 0) {
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gb->mbc_rom_bank = gb->huc1.bank_low | (gb->mbc1.bank_high << 6);
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gb->mbc_ram_bank = 0;
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}
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else {
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gb->mbc_rom_bank = gb->huc1.bank_low;
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gb->mbc_ram_bank = gb->huc1.bank_high;
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}
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break;
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case GB_HUC3:
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gb->mbc_rom_bank = gb->huc3.rom_bank;
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gb->mbc_ram_bank = gb->huc3.ram_bank;
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break;
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}
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if (gb->mbc_rom_bank == 0 && gb->cartridge_type->mbc_type != GB_MBC5 && gb->cartridge_type->mbc_type != GB_HUC3) {
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gb->mbc_rom_bank = 1;
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}
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}
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void GB_configure_cart(GB_gameboy_t *gb)
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{
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gb->cartridge_type = &GB_cart_defs[gb->rom[0x147]];
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if (gb->rom[0x147] != 0 && memcmp(gb->cartridge_type, &GB_cart_defs[0], sizeof(GB_cart_defs[0])) == 0) {
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GB_log(gb, "Cartridge type %02x is not yet supported.\n", gb->rom[0x147]);
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}
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if (gb->cartridge_type->has_ram) {
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if (gb->cartridge_type->mbc_type == GB_MBC2) {
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gb->mbc_ram_size = 0x200;
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}
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else {
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static const int ram_sizes[256] = {0, 0x800, 0x2000, 0x8000, 0x20000, 0x10000};
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gb->mbc_ram_size = ram_sizes[gb->rom[0x149]];
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}
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gb->mbc_ram = malloc(gb->mbc_ram_size);
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/* Todo: Some games assume unintialized MBC RAM is 0xFF. It this true for all cartridges types?*/
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memset(gb->mbc_ram, 0xFF, gb->mbc_ram_size);
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}
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/* MBC1 has at least 3 types of wiring (We currently support two (Standard and 4bit-MBC1M) of these).
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See http://forums.nesdev.com/viewtopic.php?f=20&t=14099 */
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/* Attempt to "guess" wiring */
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if (gb->cartridge_type->mbc_type == GB_MBC1) {
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if (gb->rom_size >= 0x44000 && memcmp(gb->rom + 0x104, gb->rom + 0x40104, 0x30) == 0) {
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gb->mbc1_wiring = GB_MBC1M_WIRING;
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}
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}
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/* Set MBC5's bank to 1 correctly */
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if (gb->cartridge_type->mbc_type == GB_MBC5) {
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gb->mbc5.rom_bank_low = 1;
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}
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}
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