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Emulate Echo RAM

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This commit is contained in:
Franco Colmenarez 2021-10-17 12:02:33 -05:00
parent b3ba7b309e
commit e1d29d9530
1 changed files with 21 additions and 2 deletions
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23
src/bus.rs
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@ -57,7 +57,12 @@ impl Bus {
match MemoryMap::get_map(address) { match MemoryMap::get_map(address) {
MemoryMap::BankZero => self.game_rom.read(address), MemoryMap::BankZero => self.game_rom.read(address),
MemoryMap::BankSwitchable => self.game_rom.read(address), MemoryMap::BankSwitchable => self.game_rom.read(address),
// MemoryMap::InterruptEnableRegister => self.data[address as usize], MemoryMap::WorkRAM1 | MemoryMap::WorkRAM2 | MemoryMap::InterruptEnableRegister => self.data[address as usize],
MemoryMap::IORegisters => match address {
0xFF44 => 0x90,
0xFF4D => 0xFF,
_ => self.data[address as usize],
}
_ => self.data[address as usize], _ => self.data[address as usize],
} }
} }
@ -67,7 +72,21 @@ impl Bus {
} }
pub fn write(&mut self, address: u16, data: u8) { pub fn write(&mut self, address: u16, data: u8) {
self.data[address as usize] = data; match MemoryMap::get_map(address) {
MemoryMap::WorkRAM1 | MemoryMap::WorkRAM2 => {
self.data[address as usize] = data;
// Copy to the ECHO RAM
if address <= 0xDDFF {
self.data[(0xE000 + (address - 0xC000)) as usize] = data;
}
},
MemoryMap::EchoRAM => {
self.data[address as usize] = data;
// Copy to the working RAM
self.data[(0xC000 + (address - 0xE000)) as usize] = data;
},
_ => self.data[address as usize] = data,
};
} }
pub fn write_16bit(&mut self, address: u16, data: u16) { pub fn write_16bit(&mut self, address: u16, data: u16) {