Nonimpact printers, 12-10 electrothermal printers, 12-13 inkjet printers, 12-13 laser  printers,  12-11 Nontactical systems, 1-8 Nonvolatile memory, 6-2 Number systems, 4-2 Numeric data coprocessor, 5-23 O Octal, 4-3 ODA,  7-33 ODR,  7-33 Online/offline operations, 1-12 Operand addressing direct, 8-10 extended,  8-11 immediate,  8-11 implicit,  8-11 indexed,  8-11 indirect, 8-12 instruction, 8-10 relative, 8-12 task state, 5-10 Operand bus, 5-25 Operands, 5-20, 8-9 addressing, 8-10 Operating modes battle  short,  1-13 dual-channel, 7-11 externally  specified  index,  7-11 I/O operations, 7-35 intercomputer  channel,  7-11 online/offline, 1-12 single  channel,  7-11 Operating systems, 8-4 Operation code,  8-7 levels of instructions, 5-10 types, 5-20 Operational capabilities/limitations, 1-13 programs, 8-3 requirements of computer systems, 1-14 uses of computers, 1-7 Operations, 1-1, 1-7 control memory, 7-15 fixed  point,  5-20 floating  point,  5-20 functions, 1-1, 1-7 intercomputer I/O, 7-35 logical,  5-23 memory, 6-4 parallel,  7-13 Operator controls, 1-15,3-1 displays,  3-2 indicators,  3-2 potentiometer,   3-1 protective devices, 3-2 switches,  3-2 time totalizing meter, 3-2 Operator panels, 3-7 Organization, memory, 6-2 Orientation, print, 12-4 Oscillators,  4-23 Output  cable,  7-33 Output  data request/acknowledge,    7-33 sequence of events, 7-34 P Pat, math, 5-23 Packets,  6-14 P a n e l s control/maintenance,   3-8 operator,  3-7 power/temperature, 3-7 Paper-feed assembles, 12-6 friction  feed,  12-6 tractor feed, 12-6 Parallel . data  interfacing,  7-31 format, 7-9 operations,   7-13 Parity check, 6-7 Parity checks, tape, 9-9 Pcb,  2-19,6-3 Peripheral  drivers,  4-21 Personal systems, 1-9 Phase  mode,  8-15 Physical  layouts,  2-4,2-8 Pin description, RS-232, 7-30 Pointers, buffer address, 7-14 Polled  I/O,  7-15 INDEX-10