Extracted MOS 6502 from NES project and turned into isoleted crate

Author: lndl

.gitignore

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+target

Cargo.lock

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+[package]
+name = "mos6502"
+description = "A MOS 6502 Simple CPU Emulator"
+version = "0.1.0"
+authors = ["[email protected]"]
+exclude = ["examples/**"]
+
+[lib]
+name = "mos6502"

Cargo.toml

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+extern crate mos6502;
+
+use mos6502::cpu::CPU;
+use mos6502::memory_map::memory_map::MemMappeable;
+
+struct Ram {
+    ram: [u8; 4096]
+}
+
+impl Ram {
+    pub fn new() -> Ram {
+        Ram {
+            ram: [0; 4096]
+        }
+    }
+}
+
+impl MemMappeable for Ram {
+    fn read(&self, address: usize) -> u8 {
+        self.ram[address]
+    }
+
+    fn slice(&self, from: usize) -> &[u8] {
+        &self.ram[from..self.ram.len()]
+    }
+
+    fn write(&mut self, address: usize, value: u8) -> u8 {
+        self.ram[address as usize] = value;
+        value
+    }
+}
+
+struct Rom {
+    rom: Vec<u8>
+}
+
+impl Rom {
+    pub fn new(rom: Vec<u8>) -> Rom {
+        Rom {
+            rom: rom
+        }
+    }
+}
+
+impl MemMappeable for Rom {
+    fn read(&self, address: usize) -> u8 {
+        self.rom[address]
+    }
+
+    fn slice(&self, from: usize) -> &[u8] {
+        &self.rom[from..self.rom.len()]
+    }
+
+    fn write(&mut self, _address: usize, _value: u8) -> u8 {
+        panic!("No writes in ROM!")
+    }
+}
+
+fn main() {
+    let ram = Ram::new();
+
+    let program = vec![
+        0xa2, 0x01,
+        0xa9, 0x05,
+        0x85, 0x01,
+        0xa9, 0x07,
+        0x85, 0x02,
+        0xa0, 0x0a,
+        0x8c, 0x05, 0x07,
+        0xa1, 0x00
+    ];
+
+    let rom = Rom::new(program);
+    let mut cpu = CPU::new();
+
+    cpu.mount_in_bus(0x0000..0x1000, ram);
+    cpu.mount_in_bus(0xe000..0xe010, rom);
+
+    cpu.set_pc(0xe000);
+
+    for _ in 0..8 {
+        cpu.step();
+    }
+
+    assert_eq!(0x0a, cpu.a);
+    assert_eq!(0x01, cpu.x);
+    assert_eq!(0x0a, cpu.y);
+}