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Add support for the Game Boy MBC6 mapper (ROM read)
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@ -421,7 +421,7 @@ void showCartInfo_GB() {
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else if ((romType == 25) || (romType == 26) || (romType == 27) || (romType == 28) || (romType == 29) || (romType == 309))
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print_Msg(F("MBC5"));
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else if (romType == 32)
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print_Msg(F("MBC6 (no support)"));
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print_Msg(F("MBC6"));
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else if (romType == 34)
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print_Msg(F("MBC7"));
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else if (romType == 252)
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@ -924,18 +924,28 @@ void readROM_GB() {
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if (romType == 0x104) {
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startBank = 0;
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romBanks >>= 1;
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endAddress = 0x7FFF;
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}
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// MBC6 banks are half size
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else if (romType == 32) {
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romBanks <<= 1;
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endAddress = 0x3FFF;
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}
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for (word currBank = startBank; currBank < romBanks; currBank++) {
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// Second bank starts at 0x4000
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if (currBank > 1) {
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romAddress = 0x4000;
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// MBC6 banks are half size
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if (romType == 32) {
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endAddress = 0x5FFF;
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}
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}
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// M161 banks are double size and need mapper reset
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// Set ROM bank for M161
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if (romType == 0x104) {
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romAddress = 0;
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endAddress = 0x7FFF;
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PORTH &= ~(1 << 0);
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delay(50);
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PORTH |= (1 << 0);
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@ -953,6 +963,14 @@ void readROM_GB() {
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}
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}
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// Set ROM bank for MBC6
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else if (romType == 32) {
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writeByte_GB(0x2800, 0);
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writeByte_GB(0x3800, 0);
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writeByte_GB(0x2000, currBank);
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writeByte_GB(0x3000, currBank);
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}
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// Set ROM bank for TAMA5
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else if (romType == 0xFD) {
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writeByteSRAM_GB(0xA001, 0);
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