I CSI 124X Lecture Notes - Lecture 4: Terabyte
2 Jun 2017
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A sequence of instructions to do a task is called a program. Also known as software, or sometimes a script. Ex) word, outlook, firefox, adobe acrobat, skype, world of warcraft. All of these use the execution of instructions, and the manipulation of data. Binary codes inside the computer, every piece of information is either a 0 or a 1. A single 0 or 1 value is a bit: every byte in memory is a group of eight bits. Everything in memory is encoded using collections of bits. All larger byte representations are in blocks of size 2n kilobyte = 2 10 bytes (or 1,024 bytes) . Megabyte = 2 20 bytes (or 1,048,576 bytes) gigabyte = 2 30 bytes (or 1,073,741,823 bytes) terabyte. = 2 40 bytes (or 1,099,511,627,776 bytes) acronyms are kb, mb, gb, tb, respectively. To program the first computers, programmers had to enter the binary strings themselves. Programs in this form are called machine code.
