Cache memory design: an evolving art

Article Abstract:

Manufacturers are building cache memories into microcomputers. A cache memory holds certain information from the main memory so that a microprocessor can access it quickly. Cache design is complex and crucial to computer performance. The designer must consider the cache size and establish a cache hierarchy. The cache must be able to fetch data from main memory and to replace unneeded data. The cache must be organized efficiently, and it must keep its data up to date. Some computers access a cache with a virtual address. The developer must ensure that the main memory and the cache do not contain different versions of the same data. Computer scientists are conducting research into these parameters to improve cache memory technology.

Computer memory, Systems analysis, Industrial research, Technology, Product introduction, Memory management, Cache memory, Research and Development, System Design, New Technique, Semiconductor Memory, technical

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Matrix printer: no pulleys, belts, or screws

Article Abstract:

The IBM Proprinter is an example of the trend in industry toward reducing the number of parts in a product's design to facilitate production. Its design incorporates the company's 1983 manufacturing design guidelines for producing reliable products at reduced costs. The reduction in parts allows for automated assembly with fewer operations. Two primary methods of limiting the number of parts are to design single parts for multiple functions, and to employ 'snap together' fastening techniques to eliminate screws and nuts. The printers are assembled at IBM's Lexington, KY plant on an automated line with eight robots, which begin with a base plate and build the part in layers, with a minimum of turning and other movements.

Design and construction, Manufacturing, Design, Printers, IBM Proprinter (Computer printer)

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PC Jr.: misreading the market

Article Abstract:

The IBM PC Jr. represents the IBM's first big failure in its successful line of PCs, due in part to poor market judgement. Its closed architecture was viewed as a major drawback in 1983, when most home computers featured expansion slots. It was also priced higher than many systems of its day. There were difficulties in adapting the IBM PC architecture for home use through video game ports, and expansion modules were not available for a year after the product's debut.

Product discontinuation, Microcomputer, Computer Design, Product Failures, IBM PCjr (Microcomputer)

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