Exercise three Essay Example | Topics and Well Written Essays - 750 words

Exercise three - Essay Example In the history of teaching information systems, there has been a shift of emphasis in regard to teaching OS material. Previously the focus was on disk operating system (DOS). This was the first operating system for IBM compatible desk top computers. Then, the RAM was quite limited and the programming language used was BASIC (Hailperin 57). In the 1980s sequential storage devices were used to store programs. Unlike RAM, these types of data is stored and accessed in sequence. Today we have many different types of operating systems, and they can be broken down into two types of OS. 1) Open source Operating Systems 2) Proprietary Operating Systems Proprietary OS are owned by corporations and controlled by them. Examples are DOS and WINDOWS versions. In open source OS, the codes are open to everyone and therefore, anyone can make changes to the OS. There is a third class of OS labelled as Embedded Operating Systems. They are the operating systems that are permanently stored on ROM (Read Only Memory) chips that are embedded into smart phones, video games, and other electronic devices. The American Standard Code for Information Interchange (ASCII) was developed. The code typically uses an 8 bit code which would have 2 to the 8th power possible orderings of the bits. This could represent 256 different characters (Hailperin 264). This application software is more restricted in whatever it performs, but it often completes a task much better or easier than general purpose software. For example, a tax calculation program that keeps a record of expenses for tax purposes. The internet community knows that the main step in shielding their private information on the internet is to certify that they use an encrypted link. As a consequence, phishing attacks, which make use of SSL certificates, are risky as they are linked with increased level of guarantee. The extent of an RSA public key gives a signal of the power of the