z486: A 486-Class Pipelined FPGA CPU with Integrated Floating-Point

The z486 is an open-source, 80486-class pipelined x86 CPU core developed in SystemVerilog, building on prior work with the z386 CPU core. It features innovative performance optimizations like early start instruction overlaps and hardwired execution for common instructions, making it a significant advancement in FPGA CPU design.