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dma and mbc1 passing

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This commit is contained in:
Samuel Walker
2025-05-30 11:15:21 -06:00
parent 1455bc5666
commit 26b1f10e16
7 changed files with 76 additions and 23 deletions
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74
lib/cart.c
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@ -250,6 +250,25 @@ bool cart_load(char *cart) {
fprintf(stderr, "WARNING!!! The header checksum does not match! ROM may be corrupt or invalid!\n");
}
if(cart_mbc1() && ctx.header->rom_size >= 5) {
int count = 0;
for(int i = 1; i < 4; i++) {
u32 start_addr = (i << 18);
bool same = true;
for(int j = 0x104; j < 0x134; j++) {
if(ctx.rom_data[start_addr | j] != ctx.rom_data[j]) {
same = false;
break;
}
}
if(same)
count++;
}
if(count >= 2) {
ctx.is_multicart = true;
}
}
if(ctx.battery) {
cart_battery_load();
}
@ -294,38 +313,66 @@ void cart_write(u16 address, u8 value){
if((address & 0xE000) == 0x2000) {
//rom bank
if(value == 0) {
value = 1;
}
if(cart_mbc3()) {
value &= 0b1111111;
if(value == 0) {
value = 1;
}
ctx.rom_bank_value = value;
ctx.rom_bank_x = ctx.rom_data + (0x4000 * ctx.rom_bank_value);
}else {
//printf("Bank Value: %d\n", value);
value &= 0b11111;
if(value == 0) {
value = 1;
}
if(ctx.is_multicart)
value &= 0b1111;
//printf("Bank Value after filter: %d\n", value);
switch(ctx.header->rom_size) {
case 0: value &= 0b1; break;
case 1: value &= 0b11; break;
case 2: value &= 0b111; break;
case 3: value &= 0b1111; break;
default: break;
}
ctx.rom_bank_value = value;
if(ctx.header->rom_size >= 5) {
ctx.rom_bank_x = ctx.rom_data + (0x4000 * (ctx.rom_bank_value+ctx.rom_bank_value_2));
//printf("(REG1 >5) Banked %d\n", ctx.rom_bank_value+ctx.rom_bank_value_2);
return;
}
ctx.rom_bank_x = ctx.rom_data + (0x4000 * ctx.rom_bank_value);
//printf("(REG1 <5) Banked %d\n", ctx.rom_bank_value);
}
}
if((address & 0xE000) == 0x4000) {
//ram bank number
if(cart_mbc1() && ctx.banking_mode && ctx.header->rom_size >= 5) {
if(cart_mbc1() && ctx.header->rom_size >= 5) {
if(ctx.header->rom_size == 5)
value &= 0b1;
ctx.rom_bank_value_2 = (value & 0b11) << 5;
if(ctx.is_multicart)
ctx.rom_bank_value_2 = (value & 0b11) << 4;
ctx.rom_bank_x = ctx.rom_data + (0x4000 * (ctx.rom_bank_value+ctx.rom_bank_value_2));
ctx.rom_bank_x2 = ctx.rom_data + (0x4000 * (ctx.rom_bank_value_2));
//printf("(REG2 >5) Banked %d\n", ctx.rom_bank_value+ctx.rom_bank_value_2);
if(ctx.banking_mode)
ctx.rom_bank_x2 = ctx.rom_data + (0x4000 * (ctx.rom_bank_value_2));
return;
}
ctx.ram_bank_value = value & 0b11;
if(ctx.ram_banking) {
if(cart_need_save) {
if(cart_need_save()) {
cart_battery_save();
}
ctx.ram_bank = ctx.ram_banks[ctx.ram_bank_value];
if((ctx.header->ram_size == 2 && ctx.ram_bank_value == 0) ||
(ctx.header->ram_size == 3 && ctx.ram_bank_value < 4) ||
(ctx.header->ram_size == 5 && ctx.ram_bank_value < 8) ||
(ctx.header->ram_size == 4)) {
ctx.ram_bank = ctx.ram_banks[ctx.ram_bank_value];
}
}
}
@ -349,10 +396,17 @@ void cart_write(u16 address, u8 value){
}
if (ctx.ram_banking) {
if(cart_need_save) {
if(cart_need_save()) {
cart_battery_save();
}
ctx.ram_bank = ctx.ram_banks[ctx.ram_bank_value];
if((ctx.header->ram_size == 2 && ctx.ram_bank_value == 0) ||
(ctx.header->ram_size == 3 && ctx.ram_bank_value < 4) ||
(ctx.header->ram_size == 5 && ctx.ram_bank_value < 8) ||
(ctx.header->ram_size == 4)) {
ctx.ram_bank = ctx.ram_banks[ctx.ram_bank_value];
}
} else {
ctx.ram_bank = ctx.ram_banks[0];
}
}
}
@ -411,7 +465,7 @@ u8 cart_get_rom_bank() {
}
void cart_load_state(const cart_state* state){
ctx.ram_enabled = state->ram_enabled;
ctx.ram_enabled = state->ram_enabled;
ctx.ram_banking = state->ram_banking;
ctx.banking_mode = state->banking_mode;
ctx.rom_bank_value = state->rom_bank_value;