SL TIPS: What do we mean by general of compting and the inf...

SL TIPS: What do we mean by general of compting and the inf...:  What do we mean by general purpose? 􀁺 Most devices can be described by their function e.g Washing Machine, DVD Player 􀁺 Computers, howeve...

SL TIPS: What is the information techonology in the today w...

SL TIPS: What is the information techonology in the today w...: information techonology  is the use of computers to store, retrive, transmit and manipulate data.or information techonology is typically use...

SL TIPS: about of the plagarisums and others

SL TIPS: about of the plagarisums and others:  the basic of common types of the plagarisum frist of the plagrisum  the plagarisum is the copy the another writer content or aknowlagement ...

history of the computers

 history of the computers 

early computers used relays mechanical counters or delay lines for main memory 

functions ultrasonic delay lines were serial devices which could only reproduce 

data in the order it was written  drum memory.could be expanded at rekatively

low cost but effcient retrieval of out of discrete transistors were used for smaller

and faster.memories such registers such registers were relatively large and

too costly to use for large amout of data generally only a few hundred bits of such could be provided

random access memory

 random access memory is a form of computer memory that can be read and 

change that can be read and change in the any order typically used to store 

working data and machine code.ram contains the multiplexing and demulplexing circurity to 

circuitry to connect the data lines to the addressed storage for reading or writing the entry usuawlly

more than one bit of the storage is accessed by the same address and ram device often have multiple data 

lines and are said to be 8 bit or 16 bit etc.devices

in today techonology ramdom-access memory takesthe form of intergrated circuit chips mos memory cells

ram is normally associated with the volatile types of memory such as dynamic random access memory dram module 

the two main types of the volatile memory random access semiconductor memory are the static random access memory and 

dyanamic random access memory commercial users of semiconductor ram data back to 1965

when ibm introduce the sp95

chip for their system 360 module modle 95 computer and toshiba used dram memory cells for its toscal 

 ector holds 512 bytes of knowledge. By dividing the entire range of sectors by eight, we have a tendency to see that there ar thirty five,843,686 sectors per surface. Dividing once more by 49855, we have a tendency to see that there ar roughly 719 sectors per track. it's fascinating that the particular range is 718.96 sectors per track. Why isn’t this price an entire number? In alternative words, however will we've a divisional range of sectors per track? There ar variety of potentialities and that we needn't hesitate it. However, one risk is that the amount of sectors per track isn't uniform across the disk surface as a result of the world spacing changes as we have a tendency to move from the middle of the disk to the skin. in an exceedingly read-only memory or videodisc drive this can be corrected by dynamical the motility speed of the drive because the optical maser moves in and out. But, since the disc rotates at a set rate, dynamical the recording density as we have a tendency to move from inner to outer tracks makes the foremost sense. Anyway, back to our calculation. If every track holds 719 sectors and every sector is 512 bytes, then every track holds 368,128 bytes of knowledge. Since there ar eight tracks per cylinder, every cylinder holds two,945,024 bytes. Now, here’s wherever the large numbers are available in. Since we've 49855 cylin-ders, our total capability is 146,824,171,520 bytes, or 146.8 Gbytes. Before we have a tendency to leave the topic of disk drives, let’s take into account an added issue. Considering the drive specifications, above, we have a tendency to see that access times ar measured in units of milliseconds (msec), or thousandths of a second. Thus, if your information sectors ar opened up over the disk, then accessing every block of 512 bytes will simply take seconds of your time. examination this to the time needed to access information hold on in main memory, it's straightforward to envision why the drive is ten,000 times slower than main memory