whats the first verson of dos based on.

[Circlenaut]

Unix?

 

[AkumaBao]

The first version? I'm not sure that it's UNIX. I could be very wrong though.

 

[mastertech01]

Copy and Paste From the Internet...

The History of DOS

One of the first operating systems for personal computers was DOS. This operating system was a cut-down implementation of the CP/M operating system designed for the 8088 family of computers. The original implementation, called QDOS (Quick-and-Dirty Operating System), was designed by Tim Patterson for Seattle Computer Products. This product was eventually licensed to Microsoft, and Microsoft then demonstrated the operating system to IBM.

IBM originally used the acronym DOS in the early 1960?s for their disk operating system for the 360 series computers.

CP/M originally stood for Control Program / Monitor, and was programmed by Gary Kildall for both the 8080 (IBM) and the Z80 (Apple II) family of microcomputers. Many of the characteristics of CP/M have been attributed to early versions of DEC operating systems like TOPS-10, OS/8, RSTS, and RSX-11.

The following is a brief timeline of DOS. This timeline summarizes all versions of DOS, and does not specifically follow any particular type of DOS.

DOS 1.0
Released in 1981 to supplement the IBM-PC IBM-PC. First version of DOS. Supported 16K of RAM, single-sided 5.25 inch 160K Floppy

DOS1.1
Fixed many bugs from 1.0 Double-sided floppy support for 320K drives

DOS 2.0
Supplemented the release of IBM's XT in 1983. more than twice the commands of 1.x hard disk support (very small, around 5MB)

DOS 2.1
Supplemented the release of IBM's PCjr. Some minor improvements were added

DOS 3.0
Designed to support newer IBM-AT Hardware. A few LAN features added, (hardly any)

DOS 3.1
More LAN features and support added

DOS 3.2
Added support for 3.5 inch floppy drive (720K)

DOS 3.3
Added support for IBM's PS/2 and the new 3.5 inch 1.44MB floppy drive. New international character set was added with support for 17 countries

DOS 4.0
DOS Shell added, some minor changes and bug fixes.

DOS 5.0
Implemented in 1991, including superior memory management features and tools Macro support, Shell enhancements

DOS 6.x
Support for Microsoft Windows, disk defrag, file compression, backups, anti-virus, Memmaker, etc.