SuperDOS 5.2A
Released in 1991 by BlueBird Software
For IBM PC, AT, and PS/2 compatibles.

BlueBird SuperDOS is a proprietary multi-tasking multi-user system
built to run business applications simultaneously over dumb
terminals, replacing expensive mainframe/minicomputers with a single
commodity PC.

It was first released around 1983 for 8-bit Z80 IBC/Integrated
Business Computers systems, and then IBM PC systems. It grew to
support protected mode on 386/486 systems. Although it uses MS/PC-DOS
to install, "Protected Mode SuperDOS is a freestanding operating
system that is not dependent on either DOS or the ROM BIOS.". Most
applications for it are written in BlueBird SuperDOS Business Basic.

Bluebird SuperDOS was originally developed for car rental agencies
and moving-and-storage companies that needed workstations at many
points for data entry, but did not want to put a powerful and
expensive computer on every desk.

Applications produced for it included CPA, Medical Office, Legal
Office, Manufacturing, Auto Rental, Van and Storage, Wholesale
Distribution, and Word Processing. Most of these were ported from
Data General compatible Business Basic software.

Initially it competed with Data General's Business Basic. A similar
multi user basic-oriented product was Thoroughbred/OS, and much later
Citrix Multiuser attempted to fill a similar role.

Installation is very complex. It requires "building" the
configuration under a DOS environment. You MUST read the manuals.

Important: Not all of these disks are formatted for MS-DOS! Opening
these disks in WinImage will only show an empty disk.

Important: This software is copy protected, it requires a hardware
dongle in order to enable multiple users.

Archive includes eight 360k 3.5" floppy disk images and eleven 720k
5.25" floppy disk images.

This archive includes only the standard double precision program 
disks, with the exception of Business Basic, which has both.