Jos Dreesen wrote: The 10/12/13 Microm set is unfortunately very old, so I don't think it will run any "recent" releases of the WD Microengine software. There might have been even earlier sets, but the CP2171 Microm sets I've seen are: 10/12/13 14/15/16 14/15/17 14/15/18 -- required for operating system III.0 release H0 or later The "A" or B" in the suffix is just whether it is ceramic or plastic, respectively. Someone (maybe ACP Components?) was selling CP2171 chips of the various versions on eBay last year. I don't see any listed now, but perhaps they might still have some. The CP2151 "data" chip is AFAICT exactly the same as the CP1611 data chip used in the LSI-11 and WD16. However, the CP2161 "control" chip is definitely NOT interchangeable with the CP1621 of the LSI-11 or the CP1661 of the WD16; at the very least they have different PLA contents. I haven't been able to get a copy or image of a bootable diskette, unfortunately. Beyond that, it would be amazingly cool to get a copy of the Ada compiler; while the Ada compiler was apparently not too useful due to the inadequate memory address space of the Microengine, it was actually validated.