This is by far not as common as the 8bit Alphatronic PC, it's the Alphatronic PC-16, the unloved child of an office appliance and a home computer. Too expensive, not enough RAM, too late ... it wasn't a big success.
Like the Alphatronic PC, the keyboard case contains the mainboard, and one of the two external floppy drives has the disk controller board in it. In this case, the power supply from the disk drives also powers the PC. It's another example of the MS-DOS compatible, but not IBM compatible type of computers that were around during the 80s. The MS-DOS is a special adaptation, and the disk format is 40 tracks, 5 sectors/track at 1024 bytes/sector.
The slot on the right side of the case takes the graphics card which can be exchanged for a BTX module.
I got a bunch of floppies with the machine and was able to read and image all but three.
Photos, ROM dumps (thanks again TeamE) and the disk images are on the FTP and here:Alphatronic PC-16