Crate mc6809_core 

emu6809-core

A Motorola 6809 CPU emulator core.

Provides a Cpu that executes 6809 instructions against any memory system implementing the Bus trait.

Example

use mc6809_core::{Cpu, Bus};

struct FlatRam([u8; 65536]);

impl Bus for FlatRam {
    fn read(&mut self, addr: u16) -> u8 { self.0[addr as usize] }
    fn write(&mut self, addr: u16, val: u8) { self.0[addr as usize] = val; }
}

let mut bus = FlatRam([0; 65536]);
// Place a reset vector pointing to 0x0400
bus.0[0xFFFE] = 0x04;
bus.0[0xFFFF] = 0x00;
// Place a NOP at 0x0400
bus.0[0x0400] = 0x12;

let mut cpu = Cpu::new();
cpu.reset(&mut bus);
assert_eq!(cpu.reg.pc, 0x0400);
cpu.step(&mut bus);
assert_eq!(cpu.reg.pc, 0x0401);

Re-exports

pub use bus::Bus;

pub use bus::BusSignals;

pub use registers::ConditionCodes;

pub use registers::Registers;

Modules

addressing

Indexed addressing mode decoder for the 6809.

alu

ALU (Arithmetic Logic Unit) helpers for the 6809.

bus

registers

Structs

Cpu

Motorola 6809 CPU emulator.

Functions

instruction_cycles

Returns the base cycle count for a 6809 instruction.