别具一格的急冻王CUP 488风扇

没有人否认CPU散热器在一台电脑中起到的重要作用,特别是当前CPU频率飞速提升的今天。人们也想尽办法为各种高性能CPU设计散热器,如今市场上的产品已是种类繁多,难免让我们看得有些眼花缭乱。今天给大家介绍一款造型别致、有着独特设计理念的风扇——急冻王CUP 488。     

Scheme-79 — Lisp on a Chip

The Scheme-79 single-chip microcomputer implements an automatic storage allocation system and an interrupt facility to support direct interpretation of a variant of the Scheme dialect of Lisp.     

The Honeywell Experimental Distributed Processor – an Overview

The Honeywell Experimental Distributed Processor (HXDP) is a vehicle for research in the science and engineering of processor interconnection, executive control, and user software for a certain class of multiple-processor computers which we call "distributed computer" systems. Such systems are very unconventional in that they accomplish total system-wide executive control in the absence of any centralized procedure, data, or hardware. The primary benefits sought by this research are improvements over more conventional architectures (such as multiprocessors and computer networks) in extensibility, integrity, and performance. A fundamental thesis of the HXDP project is that the benefits and cost-effectiveness of distributed computer systems depend on the judicious use of hardware to control software costs.     

Special Feature Microprocessors in Japan — Status in 1978

By the third quarter of 1978, ten Japanese companies were producing some 80 types of microprocessors, including 61 original products. Both the rate of new product introductions and the directions of these developments are impressive.     

Special Feature: Computing in China, 1979–an Update

China's ccomplishments remain impressive in spite of political barriers to technical progress. Most limiting of these is the dictum of self-sufficiency, which makes vertical integration and its attendant efficiency impossible.     

Special Feature Requirements Anaysis in Clinical Research Information Processing —A Case Study

System designers often neglect to do a thorough requirements analysis before beginning development. This effort shows how such an analysis can improve the usefulness of a new system.     

Static worst-case execution time analysis of the μ C/OS-II real-time kernel

Worst-case execution time (WCET) analysis is one of the major tasks in timing validation of hard real-time systems. In complex systems with real-time operating systems (RTOS), the timing properties of the system are decided by both the applications and RTOS. Traditionally, WCET analysis mainly deals with application programs, while it is crucial to know whether RTOS also behaves in a timely predictable manner. In this paper, static analysis techniques are used to predict the WCET of the system calls and the Disable Interrupt regions of the μC/OS-II real-time kernel, which presents a quantitative evaluation of the real-time performance of μC/OS-II. The precision of applying existing WCET analysis techniques on RTOS is evaluated, and the practical difficulties in using static methods in timing analysis of RTOS are also discussed.