(This is a guest post by Antoni Sawicki aka Tenox)

In my previous posts I covered NT MIPS on QEMU Jazz and on the Siemens RM-200. Time for the ultimate one!

Behold! Windows NT 4.0 Server with 4-way MIPS SMP!

Specs: Siemens Nixdorf RM300-C, 4 x MIPS R4400, 128MB RAM, Cirrus 1280x1024 256 colors, AMD PCnet

Each guest CPU runs on its own separate host core. Real R4400 boards had at most 2 CPUs, but the firmware and the NT HAL handle 4 just fine. It has to be Windows Server, as Workstation only supports 2 CPUs.

CPU idle detection! NT’s idle loop just spins. LEMU detects it and halts the CPU instead. On my Mac the idle VM uses ~10% of one host core. Without it the same idle desktop burns 3 full cores!

Seamless mouse! Remember the mouse issues from the Jazz post? All solved now thanks to the vmmouse driver. No more mouse grab, the pointer just moves in and out of the window, and the scroll wheel works!

Ready to run portable image for macOS (Apple Silicon), Linux x64 and Windows x64. Unpack and run run.sh or run.cmd. At “Hit any key to continue” press Enter twice. NT logs on by itself as Administrator / password.

Download: https://files.42718.net/mirror/tenox/os/winnt/VMs/qemu-mips/nt4srv-rm300-smp4-qemu.tar.lz

Source (LEMU, my QEMU fork): https://github.com/tenox7/lemu

Have Fun with Virtualization!