SCSI (čita se – skazi) je skraćenica sa značenjem Small Computer System Interface. Zvanično ime SCSI standarda je ANSI X3.131 - 1986.
SCSI interfejs je lokalni interfejs koji služi za povezivanje više periferija, koje su ili inicijatori ili resiveri. SCSi je obostrana magistrala koja neće raditi uopšte ako ne “saobraća” u oba smera. Kompanija Shugart Associates je, i ne znajući započela razvoj SCSI-a, proizvevši Shugart Associates System Interface (SASI) 1981, godine. Daljim modifikacijama SASI interfejsa proizveden je SCSI interfejs prve generacije. SCSI je interfejs koji, uz pomoć kontrolera, šalje i prima podatke kao i struju za periferije vezane za interfejs. Ove periferije mogu biti raznih tipova (npr. HDD ili štampač).
Svaki SCSI interfejs poseduje svoj procesor koji mu omogućava da u velikom delu funkcioniše bez korišćenja resursa CPU. Ovo podrazumeva da SCSI interfejsi mogu da rade znatno više različitih zadataka istovremeno a da pritom ne opterećuju CPU. Pored toga, SCSI interfejs koristi samo jedan IRQ, bez obzira na broj povezanih periferija.
Postoji puno varijacija SCSI interfejsa. Prva i najčešća bila je paralelni SCSI (SPI) koja koristi paralelnu magistralu. Druga je Serial Attached SCSI (SAS). Novija varijanta - iSCSI uopšte ne koristi fizičku implementaciju, već se koristi TCP/IT ptotokolom kao transportnim mehanizmom.
Kratak pregled razvoja SCSI interfejsa
Postoje 3 generacije SCSI interfejsa:
• SCSI 1 - Stvoren 1986. godine. Poseduje osmobitnu magistralu i radi u taktu od 5MHz.
• SCSI 2 - Stvoren 1994. godine. Inžinjeri koji su radili na unapređenju SCSI-a su implementirali 18 komandi koje su se smatrale apsolutno neophodnim u vezi sa podrškom bilo koje SCSI periferije (Common Command Set - CCS). Prava novina SCSI2 interfejsa bio je command queing. Ovo je podrazumevalo mogućnost SCSI2 da dopušta periferijama da privremeno sačuvaju i prioritizuju komande koje dobijaju od procesora. Dodata je opcija povećanja takta do 10 MHz. Kada se ova opcija koristila, u praksi, a kasnije i zvanično, korišćen je prefiks Fast. Takođe dodata je i opcija proširenja širina magistrale (na 16 bita), i povećanja broja istovremeno povezanih periferija na (najviše) 15 (opcija Wide). Takođe, bilo je moguće i kombinovanje ovih opcija (Fast/Wide).
• SCSI 3 - Stvoren 1995. godine. Većina SCSI interfejsa ove generacije poseduju prefiks Ultra. SCSI 3 je predstavio veliki niz standarda, kao npr. SCSI paralelni interfejs (SPI) koji je omogućio SCSI periferijama da međusobno komuniciraju. Ova varijacija se i danas koristi, iako je delimično potisnuta SATA interfejsom.
Šema SCSI protokola (ANSI)
SCSI instrukcijski set
SCSI standard koristi vrlo kompleksan set instrukcija. Ove instrukcije su kreirane za Parallel SCSI magistrale, ali su uz manje promene iskorišćene i za sve druge izvedbe SCSI interfejsa, čak i iSCSI, FireWire itd.
The. Vers. 1997. The 'Secondary' of the Computer Software. Encarta, a.k.a. The CD rom.
Iran has different expectations of gender roles than America does. In the memoir Funny in Farsi by Firoozeh Dumas the main character experiences the different women’s gender roles from where she was born, Iran, to America, where she grew up. She moved to America, the land of the free because her father got a job transfer to California. She had to learn the new American culture so she could fit in with the rest of the American kids at her new school. The expectations for Iranian women were that you get married and have kids at a young age, then spend the rest of your life cooking and supporting the family. For Firoozeh this was not her expectation due to the fact that she moved to America when she was only seven years old. Throughout the story Firoozeh
After a deep depression, I felt totally devastated and without any confidence in myself. However, thanks to the support of my parents, I decided to try again. Very reluctantly, I began studies in computer science at the Universidad de Nariño. Step by step, I found interest in the subjects and courses and, especially, in its application in the real world. However, were two key aspects during my career those changed my conception: my liking for the Open Source Software (OSS) and my admission to a research group.
Yugoslavia was fabricated in the year of 1918. Located near the country of Italy, the territory is now broken up into six independent countries. The nation started to fall apart in the late 1980 's, following the World War II victory for the Allies. While some countries can benefit from diversity, there was just too much for Yugoslavia to survive. Yugoslavia as a nation failed because of too much autonomy between the six nations that came to be, too many different cultures in one nation, and simply a subjugation of overflowing diversity.
After the lecture by Harryette Mullen, I had different interpretations of the poems “Bilingual Instructions,” “Elliptical,” and “Why You and I.” Mullen’s poetry truly caught my eye more than any other poets poetry in this short amount of time because she is rule breaking and different. Before the lecture, I read these two poems multiple times, which allowed me to come up with my own thoughts and ideas of what the poems meant but when Mullen spoke out about the true meaning of her poems I found that my thoughts and ideas were not exactly correct.
The essay “Into the electronic millennium” is a cynical observation of an author named Sven Birkerts, towards the electronic era of 21st century. Author’s overall intent of the essay is to put forth an awareness with a pinch of bias on the electronic damage to the society. He makes many assertions to argue his points which are some what valid even today, some of them which capture quick attention are: “The electronic media are invisible in process, but omnipresent in product” (Birkerts), “the only way that we can understand what is happening- what has already happened- is by the way of serve and unnatural dissociation of sensibility” (Birkerts). With all these impressive protestations, author is trying to make his readers ponder about the topic, as he says, “ To get the grip on the dimensions of the change, you must force yourself to imagine -deeply and in non-televisual terms- what the world was like a hundred, even fifty, years ago” (Birkerts).
The contribution of ISTAR to operations (2010) [Online]. Available at: http://www.publications.parliament.uk/pa/cm200910/cmselect/cmdfence/225/225.pdf (Accessed: 2nd Jan 2014)
"Short History of Radio A Short History of Radio With an Inside Focus on Mobile Radio." fcc.gov. Version 2003-2004. N.p., n.d. Web. 4 Dec. 2013. .
Following shortly after Z3, Britain's Colossus in 1943 and two years later America came up with another system ENIAC (Electronic Numerical Integrator and Computer)
Mostly we will meet two groups of people manipulating Macs and PCs mainly in contemporary society. Either is proud of the outstanding performances of Macs or PCs. In contrast, there are consumers who are involved in a dilemma of starting from Mac or PC in their life with computers. Before making a comparison of the different types of computers, nevertheless, one most indispensable crux is to clarify the distinctions between PCs and Macs. Actually, many people easily makes the common mistake, a Mac is not a “PC”, which originally stands for “personal computer”. In fact, a Mac is a personal computer; moreover, a Mac is an extraordinary personal computer that enables varies manipulators to express their ideas with high creativity. Instead, the “PC” people mention today chiefly means the computers exploited based on the MSDOS system (Knight). Thus, broadly speaking, both of Macs and other PCs can be called “personal computers”.
Thellësia e depozitave të Bulqizës Veriut, depozita në Qafë Buall, zona Batër-Lugu i Gjatë-Fushë Lopë, zona Liqeni Sopevë-Thekën-Tërnov dhe thellësia e depozitës Thekën;
Watson, J. (2008). A history of computer operating systems (pp. 14-17). Ann Arbor, MI: Nimble Books.
For this paper to achieve success in improving the quality of the SPI module there needs to be first, a general consensus for the modules objectives. The module must meet the needs of the stakeholders, for example: If a student feels the material is not relevant to their educational or career needs, they will most likely not enroll to the module. If the module does meet industry needs for improving real job skills, they will not provide time or financial support for employee enrollment. If the computing faculty feels that the module infringes on the academic prerogatives or fails to meet the academic standards, the faculty will not support the module and will be certified.
Uminova innovation (2012), Global lansering för Nuiteq efter avtal med datorjätten Lenovo, [Online], Available on: http://www.uminovainnovation.se/nyheter/global-lansering-for-nuiteq-efter-avtal-med-datorjatten-lenovo, (Accessed on 27 January 2014).
Computers are very complex and have many different uses. This makes for a very complex system of parts that work together to do what the user wants from the computer. The purpose of this paper is to explain a few main components of the computer. The components covered are going to be system units, Motherboards, Central Processing Units, and Memory. Many people are not familiar with these terms and their meaning. These components are commonly mistaken for one and other.