No overlap between computation, I/O, think time, and response time.
Programs manually loaded via card decks.
Phase 1: (1955-1970):
User at console: one user at a time
OS becomes a batch monitor.
OS were written in Assembly languae.
No structured programming.
More efficient use of hardware.
No protection
Difficult to debug
Phase 2: (1970-1980):
Interactive timesharing.
One of the first timesharing systems.
To let multiple users interact with the system at the same time.
Users do debugging, editing, and email online.
More than one user executes their tasks simultaneously.
Phase 3: (1980-1990):
Created MS- DOS.
GUI operating systems was developed first time.
Microsoft Windows: Win 1.0 (1985) .
Phase 4 (1990-2000):
Networked Systems: (LAN).
Different machines share resources, printers, File Servers, Web Servers.
Internet service providers (service between OS and apps).
Phase 4: (2000-present):
Mobile and computer operating systems have been developed in different ways and for different uses.
Computer OS products are older and more familiar to larger groups of users.
Through this time, Microsoft Windows and Apple’s Mac OS have emerged as the two dominant operating system designs.
So many types of GUI operating systems are develop in phase 5 major types are: OS system of mobiles. window 95, window 98, window XP, window crystal vista window 8, window 10.
