complete set of five 5.25" floppy disks for Digital Research Concurrent PC-DOS Version 4.1, a rare multitasking/multiuser DOS variant from Digital Research, Inc. — the company behind CP/M.

This is a genuinely scarce piece of vintage computing history.

Disks included:

C-DOS 4.1 Start Up

C-DOS 4.1 Utilities #1

C-DOS 4.1 Utilities #2

C-DOS 4.1 Applications

C-DOS 4.1 Reference

All disks are hand-labeled and have been stored in a vintage Texo Mini-Floppy Library Case, which is included with the lot.

Condition: Disks are untested/as-is — sold for display, collection, or vintage computing use. The storage case is in good vintage condition.

A note for collectors: Concurrent PC-DOS (also known as C-DOS) was Digital Research's multitasking operating system for IBM PC compatibles, capable of running multiple programs simultaneously — remarkable for its era.

Complete sets rarely surface.

Ships carefully packed