The story of a pioneering microcomputer: its beginnings as part of a national Computer Literary Project, its innovative hardware, and its creative uses. In 1982, the British Broadcasting Corporation launched its Computer Literacy Project, intended “to introduce interested adults to the world of computers and computing.” The BBC accompanied this initiative with television programs, courses, books, and software—an early experiment in multi-platform education. The BBC, along with Acorn Computers, also introduced the BBC Microcomputer, which would be at the forefront of the campaign. The BBC Micro was designed to meet the needs of users in homes and schools, to demystify computing, and to counter the general pessimism among the media in Britain about technology. In this book, Alison Gazzard looks at the BBC Micro, examining the early capabilities of multi-platform content generation and consumption and the multiple literacies this approach enabled—not only in programming and software creation, but also in accessing information across a range of media, and in “do-it-yourself” computing. She links many of these early developments to current new-media practices. Gazzard looks at games developed for the BBC Micro, including Granny's Garden, an educational game for primary schools, and Elite, the seminal space-trading game. She considers the shift in focus from hardware to peripherals, describing the Teletext Adapter as an early model for software distribution and the Domesday Project (which combined texts, video, and still photographs) as a hypermedia-like experience. Gazzard's account shows the BBC Micro not only as a vehicle for various literacies but also as a user-oriented machine that pushed the boundaries of what could be achieved in order to produce something completely new.

This lecture presents a study of the microarchitecture of contemporary microprocessors. The focus is on implementation aspects, with discussions on their implications in terms of performance, power, and cost of state-of-the-art designs. The lecture starts with an overview of the different types of microprocessors and a review of the microarchitecture of cache memories. Then, it describes the implementation of the fetch unit, where special emphasis is made on the required support for branch prediction. The next section is devoted to instruction decode with special focus on the particular support to decoding x86 instructions. The next chapter presents the allocation stage and pays special attention to the implementation of register renaming. Afterward, the issue stage is studied. Here, the logic to implement out-of-order issue for both memory and non-memory instructions is thoroughly described. The following chapter focuses on the instruction execution and describes the different functional units that can be found in contemporary microprocessors, as well as the implementation of the bypass network, which has an important impact on the performance. Finally, the lecture concludes with the commit stage, where it describes how the architectural state is updated and recovered in case of exceptions or misspeculations. This lecture is intended for an advanced course on computer architecture, suitable for graduate students or senior undergrads who want to specialize in the area of computer architecture. It is also intended for practitioners in the industry in the area of microprocessor design. The book assumes that the reader is familiar with the main concepts regarding pipelining, out-of-order execution, cache memories, and virtual memory. Table of Contents: Introduction / Caches / The Instruction Fetch Unit / Decode / Allocation / The Issue Stage / Execute / The Commit Stage / References / Author Biographies

Massively Parallel Systems (MPSs) with their scalable computation and storage space promises are becoming increasingly important for high-performance computing. The growing acceptance of MPSs in academia is clearly apparent. However, in industrial companies, their usage remains low. The programming of MPSs is still the big obstacle, and solving this software problem is sometimes referred to as one of the most challenging tasks of the 1990's. The 1994 working conference on "Programming Environments for Massively Parallel Systems" was the latest event of the working group WG 10.3 of the International Federation for Information Processing (IFIP) in this field. It succeeded the 1992 conference in Edinburgh on "Programming Environments for Parallel Computing". The research and development work discussed at the conference addresses the entire spectrum of software problems including virtual machines which are less cumbersome to program; more convenient programming models; advanced programming languages, and especially more sophisticated programming tools; but also algorithms and applications.