54 lines
1.3 KiB
Rust
54 lines
1.3 KiB
Rust
pub trait MBC {
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fn read_byte(&self, addr: u16) -> u8;
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fn write_byte(&mut self, addr: u16, val: u8);
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fn dump_ram(&self, file: &String);
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}
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pub struct NoMBC {
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rom: Box<[u8]>,
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ram: Box<[u8]>,
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}
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impl NoMBC {
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pub fn new(rom: Box<[u8]>, ram: Box<[u8]>) -> NoMBC {
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NoMBC { rom: rom, ram: ram }
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}
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}
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impl MBC for NoMBC {
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fn dump_ram(&self, file: &String) {
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super::super::write_file(&file, &self.ram).expect("Saving failed");
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}
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fn write_byte(&mut self, addr: u16, val: u8) {
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println!(
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"Writing not supported for cartridges without MBC. (Tried to set {:04X} to {:02X})",
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addr, val
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);
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}
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fn read_byte(&self, addr: u16) -> u8 {
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match addr {
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0x0000...0x7FFF => self.rom[addr as usize],
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0xA000...0xBFFF => {
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// TODO: Check for ram
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let addr = (addr as usize) - 0xA000;
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if addr >= self.ram.len() {
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println!(
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"Tried to access {:04X}, however the memory is not present.",
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addr + 0xA000
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);
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0
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} else {
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self.ram[addr]
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}
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}
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_ => {
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panic!("Cartride: Unable to read from {:04X}", addr);
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}
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}
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}
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}
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