z386 implements an 80386-class CPU on FPGA driven by the recovered 2,560-entry 37-bit Intel microcode ROM, booting DOS 6/7 and executing protected-mode applications including Doom at 16.5 FPS (https://nand2mario.github.io/posts/2026/z386/). The core matches the original eight-unit block diagram with prefetch queue, decoder handling ModR/M and SIB, and microcode sequencer while substituting FPGA DSP blocks for multiplication. Resource metrics report 8K lines of code, 18K ALUTs, 5K registers and 116K BRAM at 85 MHz versus ao486's larger footprint. The 16 KB 4-way L1 cache and 32-entry TLB replicate 386 paging and protection logic; prior z8086 work supplied the microcode extraction methodology from reenigne's disassembly. Comparisons to historical 386 systems note the FPGA clock exceeds original parts yet CPI remains higher due to the compact cache size.