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Amiga Operating System

Amiga Operating System. Kevin Marinak Holly Medeiros John Feehan Jon Bradley Nimish Patel. Amiga History. Three dentists and 7 million dollars Amiga computer gaming system Debut - 1985: Commodore Amiga 1000 Amiga OS 1.0 for Motorola MC68000 processor Competed with and overtook Atari

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Amiga Operating System

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  1. Amiga Operating System Kevin Marinak Holly Medeiros John Feehan Jon Bradley Nimish Patel

  2. Amiga History • Three dentists and 7 million dollars • Amiga computer gaming system • Debut - 1985: Commodore Amiga 1000 • Amiga OS 1.0 for Motorola MC68000 processor • Competed with and overtook Atari • Financial disaster by 1994 • Commodore  Escom  Gateway • Amiga Research Operating System • Devoted following

  3. Technically Amazing • Several state-of-the-art features • Preemptive multitasking • Color GUI (Before Apple) • Multiple screens with different resolutions • Fast graphic subsystem (ECS) • Television connectivity (Digital to Analog Converter) • Autoconfig • Microsoft purchased rights (now plug-and-play) • Lost marketing battle between Sega / Nintendo & Microsoft / Apple

  4. File Management • File system • Original File System (OFS) • Amiga Fast File System (AFFS) • Workbench and AmigaDOS • Drawers and tools • Naming conventions • Files and directories: 30 characters long / not case sensitive

  5. AmigaOS memory • Chip RAM • Main CPU • Peripheral processors • Processes that share information • Locking needs to happen • Can be used by programs if Main memory is used up

  6. AmigaOS memory (cont.) • Fast RAM • CPU exclusive access • This RAM is much larger • Requested RAM is reserved exclusively for that program • Locking not used • Seems faster than Chip RAM

  7. AmigaOS memory (cont.) • No partitioning of memory • Write protection in Chip RAM • Programs are responsible for memory allocation • Free memory lists • Looks for equal/greater size space…if greater returns extra to list • Used memory not on list • Fragmentation

  8. Processor configurations • Mainly used in a Uniprocessor environment • Amiga has always utilized processors in addition to the CPU • Symmetrical Multi-Processing • Partially Implemented (Release 4.0) • Further implementation planned • Process states • Runnable (Ready Resident) • Running • Blocked (Waiting Resident)

  9. Scheduling • Pre-emptive Multitasking • Advantages • Lower priority background applications • Disadvantages • Overwrite or corrupt

  10. Deadlock • No deadlock prevention • No deadlock avoidance • No deadlock detection and resolution

  11. A Look into the Future • Amiga OS 3.X • Amiga OS 4.X • History • Features • Move the 68K OS3.9 to a native PPC OS, enhancing and where necessary re-implementing the OS to take advantage of the PPC CPU • Add new functionality to improve the functionality and performance of AmigaOS • Allow for full backwards computability via the Eyetech AmigaOne (with a classic Amiga attached) or retargetable application compatibility via any AmigaOne • Move the community to new, state of the art hardware • Provide an attractive computing environment to non Amigans so as to encourage growth of the Amiga community • Integrate the AmigaDE into the AmigaOS • Provide a foundation for the development of AmigaOS • Improvements

  12. Amiga OS5 • Improved Performance • Features • Brand new services model providing • Virtual Memory • Memory Protection • Symmetric and Asymmetric modes • Contract QoS • 64 bit • Fully distributed • AmigaOS4 sandbox • PDP sensory processing system - PDP stands for Physical to Digital to Physical and provides a scalable system that provides for capture, conversion, representation, manipulation and presentation of sense delimited observation and interaction • Orthogonal Persistence - all content is persistent, instead of having to be saved to and loaded from storage. • Safe and Unsafe environments - separate memory spaces in which developers can continue to use unsafe languages or develop using the new SafeC language and environment. • Semantic Context - an environment is which the user can layer any number of associations, relationships and meaning to their environment and content, and use that semantic information to organize and query.

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