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feat: implement MBC1

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This commit is contained in:
Rekai Nyangadzayi Musuka
2021-01-20 01:39:24 -06:00
parent 96bfc43312
commit b5d3a2c675
3 changed files with 372 additions and 15 deletions
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22
src/bus.rs
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@@ -82,10 +82,11 @@ impl Bus {
// 8KB Video RAM
self.ppu.vram[(addr - 0x8000) as usize]
}
0xA000..=0xBFFF => {
0xA000..=0xBFFF => match &self.cartridge {
// 8KB External RAM
unimplemented!("Unable to read {:#06X} in Extermal RAM", addr);
}
Some(cart) => cart.read_byte(addr),
None => panic!("Tried to read from the external RAM of a non-existant cartridge"),
},
0xC000..=0xCFFF => {
// 4KB Work RAM Bank 0
self.wram.read_byte((addr - 0xC000) as usize)
@@ -140,11 +141,17 @@ impl Bus {
match addr {
0x0000..=0x3FFF => {
// 16KB ROM bank 00
panic!("Tried to write to {:#06X} in ROM Bank 00", addr);
match self.cartridge.as_mut() {
Some(cart) => cart.write_byte(addr, byte),
None => panic!("Tried to write into non-existent Cartridge"),
}
}
0x4000..=0x7FFF => {
// 16KB ROM Bank 01 -> NN (switchable via MB)
panic!("Tried to write to {:#06X} in ROM Bank 01 -> NN", addr);
match self.cartridge.as_mut() {
Some(cart) => cart.write_byte(addr, byte),
None => panic!("Tried to write into non-existent Cartridge"),
}
}
0x8000..=0x9FFF => {
// 8KB Video RAM
@@ -152,7 +159,10 @@ impl Bus {
}
0xA000..=0xBFFF => {
// 8KB External RAM
unimplemented!("Unable to write to {:#06X} in Extermal RAM", addr);
match self.cartridge.as_mut() {
Some(cart) => cart.write_byte(addr, byte),
None => panic!("Tried to write into non-existent Cartridge"),
}
}
0xC000..=0xCFFF => {
// 4KB Work RAM Bank 0