SAMdisk now support MX format (at least its HEAD version does).

de-skeletonized ms0515.cpp -- CPU is a clone of T11, video controller is Spectrum-like and there's a few ported (or maybe recompiled) games, f.e.

[Linked Image from]

Pull request soon. Shout out to Dr. Titus for being the first to emulate this machine in EmuStudio.