"Lucky Byte" - anyone know what this is?

[Eric Rucker <bhtooefr@gmail.com>]

I'm not even entirely sure whether this is a 3.5" PC floppy controller, the software for such a controller, or what it is, but... doing research into Pravetz machines, and found photos of an 8S with a 3.5" floppy drive. I believe the controller is in slot 7 (not sure what is in slot 2, 4 looks like maybe a Z80 card, 6 looks like maybe one of the Pravetz clone Disk II cards):

http://anrus.snimka.bg/tuning/pravetz-8s.388210.12855445.big
http://anrus.snimka.bg/tuning/pravetz-8s.388210.12855448.big

Closeup of the 3.5" floppy drive installation:

http://anrus.snimka.bg/tuning/pravetz-8s.388210.12855443.big

Screenshots of the software:

http://anrus.snimka.bg/tuning/pravetz-8s.388210.12855458.big (an FDD configuration screen)
http://anrus.snimka.bg/tuning/pravetz-8s.388210.12855459.big ("Lucky Byte BIOS")
http://anrus.snimka.bg/tuning/pravetz-8s.388210.12855461.big (this may not be part of the same software)
http://anrus.snimka.bg/tuning/pravetz-8s.388210.12855439.big (someone getting cute with COMMAND.COM from Pinpoint)
http://anrus.snimka.bg/tuning/pravetz-8s.388210.12855440.big (MS-DOS <-> ProDOS converter)
http://anrus.snimka.bg/tuning/pravetz-8s.388210.12855442.big (this is just Copy II Plus, but it indicates that the only drive devices are in slots 6 and 7)

Any ideas of what's going on here?