Data Storage b. If the output of an OR gate is passed through a NOT gate, the combination computes the Boolean operation called NOR that has an output of 1 only when both its inputs are 0.The symbol for a NOR gate is the same as an OR gate except that it has a circle at its output. The following is a circuit containing an AND gate and two NOR gates. What Boolean operation does the circuit compute? Input Input 5. Use hexadecimal notation to represent the following bit patterns: a. 0110101011110010 c. 01001000 b. 111010000101010100010111 6. What bit patterns are represented by the following hexadecimal patterns? a. 0x5FD97b. 0x610A c. OxABCD d. 0x0100 2 Main Memory For the purpose of storing data, a computer contains a large collection of cir- cuits (such as flip-flops), each capable of storing a single bit. This bit reservoir is known as the machine's main memory Memory Organization A computer's main memory is organized in manageable units called cells with a typical cell size being eight bits. (A string of eight bits is called a byte Thus, a typical memory cell has a capacity of one byte.) Small computers embedded in such household devices as thermostats and microwave ovens may have main memories consisting of only a few hundred cells, whereas desktop computers and smartphones may have billions of cells in their main memories. Although there is no left or right within a computer, we normally envi- sion the bits within a memory cell as being arranged in a row. The left end of this row is called the high-order end, and the right end is called the low-order end. The leftmost bit is called either the high-order bit or the most significant