By Graham Taylor (auth.)
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Extra resources for Computer Studies GCSE
4 Components of an exchangeable disk pack. 5 million characters per second; disks typically spin at 3600 rpm. • Data reading and writing is done by moving read/ write heads. There is usually one head for each disk surface. • Access arms position these heads in the desired locations. The heads do not actually touch the surface of the disk - they 'float' above it. • When the access arms are moved across all the read/write heads are moved together so that each head is positioned over the same track of each recording surface.
Q. Why is it important to distinguish between main Semiconductor Memory All modern computers are now built with semiconductor main memory because of its fast access time, low cost, small physical size and low power consumption. A semiconductor memory chip is made of thousands memory and backing store? A. The distinction between the two is important for three reasons: • Cost - although the cost per bit of main (semiconductor) memory is decreasing rapidly, it is still 36 • • much higher than for backing storage devices such as magnetic disk.
E. 27) can be handled. (ii) The EBCDIC Code The Extended Binary Coded Decimal Interchange Code was developed by IBM. It is an 8-bit code which therefore permits 2 8 = 256 distinct characters. e. each character can be stored in 1 byte of computer memory. Here are some examples - the parity bit has been omitted for simplicity: Zone bits Numeric bits (place values) 8 ASCII; EBCDIC. , Device control 2 "" Device control 3 =- DC 4 "" Device control 4 NAK SYN ETB CAN EM SUB "" "" ESC FS GS RS US DEL = Escape =< Information :: Information - Information = Information = Delete - Negative acknowledgement =- Svnchtonouslidle End of transmined block Cancel (error in data) End of medium Start of special sequence file separator group separator record separator unit separator PRINTABLE CHARACTERS CHAR OCTAL A B C 1000001 1000010 1000011 1000100 1000101 a E 101 102 103 104 105 F G H I J 106 107 110 111 112 1000110 1000111 1001000 1001001 1001010 f K L M N 113 114 115 116 117 1001011 1001100 1001101 1001110 1001111 120 121 122 123 124 1010000 1010001 1010010 1010011 1010100 125 126 127 130 131 132 1010101 1010110 1010111 1011011 1011001 1011010 D 0 P Q R S T U V W X Y Z BINARY CHAR b c d e 9 h i j k I m n 0 P q r 5 t u v w x Y z OCTAL BINARY 141 142 143 144 145 1100001 1100010 1100011 1100100 1100101 146 147 150 151 152 1100110 1100111 1101000 1101001 1101010 153 154 155 156 157 1101011 1101100 1101101 1101110 1101111 160 161 162 163 164 1110000 1110001 1110010 1110011 1110100 165 166 167 170 171 172 1110101 1110110 1110111 1111000 1111001 1111010 SP !