Components, 4-1 circuits, 4-4 interfacing, 7-19 number systems, 4-2 physical layouts, 2-3, 2-6 Computers central processing units and buses, 5-1 components and circuits, 4-1 configurations and hardware, 2-1 fundamentals and operations, 1-1 input/output  and  interfacing,  7-1 instructions and man/machine interfaces, 8-1 memories,  6-1 operator controls and controlling units, 3-1 types of, 1-3 Computer switching and control panel (CSCP), 13-33 Computer viruses, 10-29 Conditioners, line, 4-29 Configurations,  1-9,  2-1 block  diagrams,  2-1 hardware, 1-10 layouts, 2-2, 2 -4, 2-6 mainframe computer, 8-23 microcomputer, 8-16 minicomputer, 8-20 software, 1-10 Connectors,   2-15 architectures, 2-15 cables,  2-15 external, 2-21 internal,  2-18 Consoles maintenance, 3-10 remote,  3-13 Control and maintenance panels, 3-8 Control memory, 5-15 operations,   7-15 Control section, 5-2 cache memory, 5-15 control memory, 5-15 instruction and control, 5-6 instruction operand addressing, 5-10 interrupts, 5-10 read-only memory, 5-17 timing,  5-3 Controlling units, 3-1, 3-4 display,  3-9 keyboards,  3-11 mainframe computer, 8-23 maintenance consoles, 3-10 microcomputer, 8-17 minicomputer,  8-21 panels, 3-7, 3-8, 3-10 power/temperature panels, 3-7 remote consoles, 3-13 teletypes, 3-12 Controls buffer,   7-21 bus,  5-24 channel,  7-14 circuits,  6-4,  7-13 data  entry/display,  8-21 external,  1-10 function/command, 7-9 independent   request,   7-18 mainframe computer, 8-23 memory, 7-13, 7-20 microcomputer, 8-17 minicomputer,   8-21 modem, 7-20 operator, 1-10 sequence,  5-5 transmit,  7-21 words, 7-9, 7-14 Converter analog  to  digital,  4-20,  13-3 Cooling systems, 2-26 Coprocessor, numeric data, 5-23 Core memory, 6-9 Correction/detection, error bit, 6-8 Counter, program, 5-6, 5-9 Counters,  4-15 CPU interface, direct, 7-14 Cycle core,  6-12 mated film, 6-18, 6-19 memory, 6-6, 6-7 read/write, 6-20 Cylinder addressing, disk, 10-4 D Daisy chaining, 7-17 Data asynchronous,   7-28 INDEX-3