SKS Nano 2515 (2500 series)
SKS (Steinmetz-Krischke Systemtechnik) were responsible for the development of the Alphatronic Px series and the ITT3030.
Their designs are based on the MC-80 bus, and they also used them for products sold under their own name.
The SKS 2500 portable computer is a beautiful CP/M machine that comes in a sturdy wooden carrying case covered in bordeaux red
leather(ette). The model number is 2515, there seem to have been coprocessor and drive configuration options available.
Unfortunately, no boot media have been found until now. And DHL killed my machine by making the drive rails snap during transport.
One hope is that by emulating the Nano, a boot disk can be created from similar machines of SKS provenance.
The floppy drives are 80 track DS/QD Philips X-3114, and the boot sequence is supposed to be similar to the ITT3030 -
after switching on the machine you are presented with a blank screen, pressing "B" boots from the first floppy drive.
Thanks to TeamE for dumping the Nano's ROMs and PROMs.
Files are, as always, on the FTP and here.