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fix mbc2

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This commit is contained in:
Alex Janka 2023-03-03 10:05:33 +11:00
parent 1de1d817ce
commit d96809e7fe
1 changed files with 18 additions and 10 deletions
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28
src/processor/memory/rom/mbcs/mbc2.rs
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@ -40,24 +40,32 @@ impl Mbc for Mbc2 {
} }
fn get_ram(&self, address: Address) -> u8 { fn get_ram(&self, address: Address) -> u8 {
0xF0 | (0x0F & self.ram.get((address - 0xA000) as usize % 512)) if self.ram_enabled {
0xF0 | (0x0F & self.ram.get((address - 0xA000) as usize % 512))
} else {
0xFF
}
} }
fn set(&mut self, address: Address, data: u8) { fn set(&mut self, address: Address, data: u8) {
if address & (1 << 8) == (1 << 8) { if address < 0x4000 {
// bit 8 is set - rom bank if address & (1 << 8) == (1 << 8) {
self.rom_bank = data & 0xF; // bit 8 is set - rom bank
if self.rom_bank == 0 { self.rom_bank = data & 0xF;
self.rom_bank = 1; if self.rom_bank == 0 {
self.rom_bank = 1;
}
} else {
// bit 8 is clear - ram enable
self.ram_enabled = (data & 0xF) == 0x0A;
} }
} else {
// bit 8 is clear - ram enable
self.ram_enabled = data == 0x0A;
} }
} }
fn set_ram(&mut self, address: Address, data: u8) { fn set_ram(&mut self, address: Address, data: u8) {
self.ram.set((address - 0xA000) as usize % 512, data); if self.ram_enabled {
self.ram.set((address - 0xA000) as usize % 512, data);
}
} }
fn mbc_type(&self) -> String { fn mbc_type(&self) -> String {