danbulant / cpu

32bit cpu architecture in logisim and rust, capable of playing bad apple

CPU

A custom 32bit CPU architecture inspired by MIPS, designed for educational purposes.

Features

• logisim circuit design (ALU + CPU itself)
• emulator written in Rust
• customasm assembly included (main.asm has example/test code, bad-apple-setup.asm plays video from RAM)
• 32bit word (incl. RAM, RAM addresses are 24bits)
• 16 general purpose registers (A-P)
• 0 register is always 0
• PC and ALU FLAGS accessible as read-only registers
• capable of playing bad apple (and other short B/W videos that fit into RAM)
• flexible instruction set (each instruction can choose which registers it uses)
• RISC design
• each instruction is 1 word (32bits)
• keyboard for input, 256x256 color display for output