Computer World. Матросова Т.А. - 42 стр.

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41
CPUs, you introduce a major obstacle. You are not likely to get an off-the-shelf Java
OS from Sun Microsystems.
Many companies that have previously offered their own proprietary real-time
OS are now developing a Java OS, or are seriously considering such an offering. My
own company, Industrial Programming, is currently using its experience with
embedded multithreading/multiprocessor operating systems to create a new system
that w ill hand le applic ations w ritten in both Java and С. And as the case with its
traditional product, MTOS-UX, the OS is transparent to the number of tightly-
coupled CPUs that are executing the application code. If one CPU is not enough, you
can add more without altering the application.
About the author
David Ripps has been in the computer field for over thirty years. He is currently
Vice President of Industrial Programming, Inc. (Jericho, NY). His functions there
include the technical supervision of the MTOS-UX product line. Among the technical
areas in which David has worked are: realtime operating systems, realtime
applications and computer simulation of physical processes. He is the author or co-
author of three books and numerous technical articles. David's formal education is in
Chemical Engineer, with а В ChE from Cornell and M ChE plus PhD from NYU.
David lives in New York City with his wife, Sylvia, and their children, Elana and
Samara.
TEXT 3
Read the text. Feel in the spaces in the text with one of these words:
bytes, chip, bits, access time, internal cache, external cache, registers, processor,
RAM, storage, data.
The main components of the computer of most significance to programmers are
disk, RAM, and the CPU; the first two of these store programs and data that are used
by the CPU.
Computers represent pieces of information (or data) as binary digits, universally
referred to as …. Each bit can have the value 0 or 1. The binary system is used
instead of the more familiar decimal system because it is much easier to make
devices that can store and retrieve 1 of 2 values, than 1 of 10. Bits are grouped into
sets of eight, called ….
The disk uses magnetic recording heads to store and retrieve groups of a few
hundred to a few thousand bytes on rapidly spinning platters in a few milliseconds.
The contents of the disk are not lost when the power is turned off, so it is suitable for
more or less permanent storage of programs and … .
…, which is an acronym for Random Access Memory, is used to hold programs
and data while they're in use. It is made of millions of microscopic transistors on a
piece of silicon called a... . Each bit is stored using a few of these transistors. RAM
does not retain its contents when power is removed, so it is not good for permanent…
However, any byte in a RAM chip can be accessed in about 10 nanoseconds, which is

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