#systems

OS links hardware and software (apps etc). It's used to create users and manage their rights on the computer.

Every OS has it's own [[File System|file system]].

History Genesis

for screenshots of GUIs http://toastytech.com/guis/indexunix.html

First OS - 1951 Lyons Electronic Office I - LEO I

Can make conversions between decimal and binary.

IBM and the Seven Dwarfs

Dominated the market till 70's. New OS, new market.

UNIX - First public OS

Ken Thompson and Dennis Ritchie developed it. K.T later developed B language and Go in Google. D.R developed C language.

Microsoft

1975 with OSs

Xenix is the first OS of the based on Unix

MS DOS (single user/single task)

• Windows 1
• Windoes 2
• Windows 3
• Windows 95 (first online services started)
• Windows 98

OS/2 developed with IBM, protect mode, Personal System/2

• Win 2000
• Win XP
• Win Vista
• Win 7
• Win 8
• Win 8.1
• Win 10
• Win 11

Apple

Created in 1976 by Steve Jobs, Steve Wozniak and Ronald Wayne

Berkeley Software Distribution (Where they have developer internet etc.) 2BSD Fork Mach Apple Lisa Office System Mac OS X

OS Comparison

• open source or proprietary
• single/multi and users/tasking
• client, server
• distributed, embedded
• file system NTFS, exFAT, FAT-32, APFS etc

"xv6 is a simple OS to test, to understand better how an OS works."