Vintage IBM Microsoft DOS Operating System 2.0 1ST Ed. w 5.25" Floppy Disks 1983

Description

Vintage IBM Microsoft DOS 2.0 Operating System with 5.25 Floppy Disks.
This is a very RARE & Collectable piece of vintage computer history.
Version 2.0 (OEM), First version to support 5.25-inch, 180 KB and 360 KB floppy disks Release date: October, 1983
The hard cover binder style book contains- Both Original 5 1/4" Floppy Disks:
Disc 1- Labeled 6936751 DOS 2.0 Personal Computer Language Series and
Disk 2- Labeled  6936786 DOS Supplemental Programs and
User Manual/ Operating Instructions - FIRST EDITION (January 1983)  Several hundred pages - Divided into 14 Chapters and 11 Appendixes.
First Edition - Published by: Microsoft Corporation Inc. (1983) & International Business Machines Corp. (1983)
P.O. Box 1328-C Boca Raton, FL 33432
This item is in well preserved excellent condition.
It was well preserved by the original owner as a valued collectable.
It does not have any noticeable flaws.
"IBM released Personal Computer DOS 2.0 on March 8, 1983 together with the IBM PC/XT. The world was a very different place from August 1981; rather than being a big unknown, the IBM PC was now a major force to be reckoned with. The PC/XT cemented IBM’s position in the market. Compared to the original IBM PC, the PC/XT added more RAM and, importantly, a built-in fixed disk.
DOS 2.0 was the first version which had been developed entirely at Microsoft, with design objectives very different from those of 86-DOS. Since 1979, Microsoft had been licensing UNIX from AT&T and marketing it under the XENIX trademark. Microsoft’s programmers were exposed to UNIX concepts and ideas, with DOS 2.0 being very much a proof of the exposure.
The primary developers of DOS 2.0 were Paul Allen (who led the team), Mark Zbikowski, and Aaron Reynolds. The other team members were Nancy Panners, Chris Peters, and Mani Ulloa; only six people developed DOS 2.0. Tim Paterson had returned to SCP and wasn’t involved in the development of DOS 2.0."
Shipped with USPS Priority Mail.
Please feel free to ask any questions about this item.