## Help

## Exercises

- Exercises - many, many exercises to go with the lectures
- Powers of Two - a browser game to practice them

## Reference

- The Number Circle - numbers aren’t on a line, silly
- MIPS style guide - how to write asm that doesn’t look terrible.
- MIPS instructions - common instructions and what they do.
- MIPS cookbook - micro-tutorials on how to do common things in MIPS.
- MIPS ⬄ C correspondences - you write asm by pretending to be a compiler. These are the rules.

## Examples

Right-click and save to download the asm and circuit files.

Safari users: Safari sometimes changes file extensions. Do not trust it.

MIPS examples | |
---|---|

fixed_point.asm | Shows how to add, multiply, and divide 24.8 fixed-point numbers. |

Numerical examples | |

Bitwise.java | Shows several bitwise operators and oddities. |

Bitflags.java | Bitflags are a way of treating the bits of an integer like a small array of booleans. |

Bitfields.java | Using bitwise operations to encode and decode colors. |

Logisim Basics | |

constant_gates.circ | Constants going into gates are pointless! Simplify! |

tunnel_tutorial.circ | Why you should use tunnels. THEY'RE GOOD OKAY |

splitter_tricks.circ | Using splitters more effectively. |

splitter_bitfields.circ | Using splitters to take apart/put together bitfields. |

Combinational Circuits | |

full_adder.circ | A 1-bit full adder made of gates. |

fast_mult_4x4.circ | A fast (combinational) 4x4 multiplier. |

Sequential Circuits | |

RS_latch.circ | An RS latch made of NOR gates. |

Circuit.js RS Latch | Circuit.js can simulate it at a lower level, so you can see the current and voltages. |

D_latch.circ | A D latch made from an RS latch. |

D_flipflop.circ | A D flip-flop made from 2 D latches. |

register_4bit.circ | A 4-bit register made from D flip-flops. |

simple_counter.circ | A register paired with an adder can count up each clock tick. |

fan_controller.circ | A simple FSM for controlling a ceiling fan. |

slow_mult_4x4.circ | An FSM that multiplies numbers using the slow (sequential) method. |

div_4x4.circ | An FSM that divides two 4-bit numbers. |

pc_fsm.circ | The "MIPS" PC FSM I made in class, but cleaned up. |

decoding.circ | Some examples of decoding an instruction. |