OS/2 1.x Pre-Release

OS/2 was originally a joint effort between IBM and Microsoft. It grew out of efforts to create a Multitasking MS-DOS. It was intended to be the future OS for IBM's new PS/2 series. At release it competed against Microsoft's Windows GUI shell, but most users continued to use DOS. OS/2 1.x was used as the basis for Citrix Multiuser

1.x was heavily criticized for its poor backwards compatibility, heavier system requirements, design decisions made in order to support 286s instead of just 386s, poor hardware compatiblity, and lack of third party driver support. There was an inaccurate, but justifiable, common belief that OS/2 could only run on genuine IBM hardware.

Still, it was believed that all future software development would be for OS/2, until an almost overnight fallout between IBM and Microsoft shifted the spotlight to the yet to be developed Windows NT.

Without Microsoft's help, IBM massively re-wrote OS/2 to produce OS/2 2.x

Below are several OS/2 pre-release prototypes.

SIZZLE: the code-name for a pre-1.0 version of OS/2 with a collection of changes intended to improve overall OS/2 performance.

Football: based on pre-1.0 OS/2 sources, demonstrated multiple DOS applications running in V86-mode. Became part of OS/2 2.0.

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

Product type
OS
Vendor
Microsoft/IBM
Release date
1986
User interface
Text
Platform
OS2

Downloads

Download Name Version Language CPU File type File size
OS2 1.0 Debugger Disk (October 12 1988) (5.25-1.2mb) 1.0 Debugger Disk (October 12 1988) English x86 5¼ Floppy 355.82KB
OS2 CP-DOS Boot Disk (v7.68) (October 22 1986) (5.25-1.2mb) CP-DOS Boot Disk (v7.68) English x86 5¼ Floppy 336.93KB
OS2 FOOTBALL Boot Disk (v4.41.00) (December 1987) (5.25-1.2mb) FOOTBALL Boot Disk (v4.41.00) English x86 5¼ Floppy 355.6KB
OS2 FOOTBALL Boot Disk (v7.68.17) (February 1987) (5.25-1.2mb) FOOTBALL Boot Disk (v7.68.17) English x86 5¼ Floppy 382.34KB
OS2 SIZZLE Boot Disk (v7.68.18 DEBUG) (January 7 1987) (5.25-1.2mb) SIZZLE Boot Disk (v7.68.18 DEBUG) English x86 5¼ Floppy 457.08KB
OS2 SIZZLE Boot Disk (v7.68.18) (October 22 1986) (5.25-1.2mb) SIZZLE Boot Disk (v7.68.18) English x86 5¼ Floppy 447.64KB

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