OS/2 1.0 Debugger Disk
Released October 12 1988 by Microsoft
For IBM PC computers

The OS/2 1.0 Debugger Disk contained a version of OS/2 1.0 built on 
October 12, 1988, which included the built-in kernel debugger used by 
Microsoft and IBM for internal development, along with a rudimentary 
program selector.
