QMCS 360 Class Notes, # 5	Dr. Rick Smith Quantitative Methods and Computer Science
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QMCS Club

Bush Grants

Evolution

Commonly used CPU features today

interrupts and DMA

kernel mode vs user mode with switching via traps

"Paged" memory

Support for multiprocessor cooperation

Common OS features today

Multiprogramming

Device drivers ("device independence")

Hierarchical file system

Multiuser with protection

Graphical user interface

Getting to Unix

Reaction to Complexity

Hardware: minicomputers, not mainframes

CTSS -> Multics -> CTSS -> Unix

CTSS + DEC/DDT -> ITS -> Unix

Unix today - diagram

Linux diagram

Getting to Windows

Evolution through DEC: Embracing Complexity

RT-11 -> CP/M -> MS-DOS

RSX-11M -> VMS -> Win-NT -> Win2K...

Windows today - diagram