More MUPID ... in fact another one that came with a different ROM revision (also with an odd ROM pair of 27256 and 27128) and the MUPID floppy disk station.
My first MUPID C2A2
This is a later ROM revision
This is the floppy station. The MUPID is only used as a dumb terminal at 4800 baud, the disk station is a fully self contained CP/M computer that can be connected (as many people did) to any serial terminal at the higher speed of 19200 baud. The disk format is a single density, FM, 10 sectors of 256 bytes on 80 tracks. It's essentially used single sided, in that the two physical drives are mapped to CP/M drives A: - D:
MUPID is an Austrian invention. German companies like Siemens or Grundig made sure the concept was sufficiently dead and their own flavour of BTX was chosen, before they offered their Mupid clones.
The archive on the FTP contains pictures, some documents, firmware for the two MUPIDs presented above, one for a German edition, the Grundig PTC-100 as well as firmware and disk images for the floppy station.