instructions, 7-9 Integrated drive electronics (IDE), 7-27 intercomputer, 7-35 Intercomputer interrupt driven, 7-15 channel  operating  mode,  7-11 IOC/IOA interfacing, 7-4 I/O  operations,  7-35 IOC/IOA module, 7-3 Interconnection  system,  5-25 MEM bus or input/output controller (IOC) bus, Interface 5-25 memory reference, 7-13 operations, 7-11, 7-13, 7-14 organization,   7-2 parallel  data  operations,  7-31 pcb’s, 7-7 polled,  7-15 processor,  7-3 serial data operations, 7-28 terminology,  7-1 wait  loop,  7-15 waveshapes, 4-8 Instruction(s), 5-19, 7-9, 8-1 bus,  5-25 character addressable, 8-12 double  length,  8-13 execute,  5-9 fetch/read, 5-9 formats, 8-7, 8-8 full-word, 8-12 half-word, 8-12 language  interpretation,  8-5 levels,  8-3 multiple-word, 8-13 operand addressing, 5-10, 8-10 operational levels, 5-10 programs/software, 8-2 register, 5-6 size,  8-12 translation, 5-9 types,  8-3 Instruction and control functions, 5-6 Integrated circuits, 4-5 categories, 4-7 digital,  4-7 families, 4-7 line  driver/receiver,  4-21 linear, 4-18, 4-20 packaging,   4-5 receiver, 4-20 regulator, 4-20 size  integration,  4-5 circuits, memory, 6-4 circuits,  systems,  4-21 direct,  7-14 enhanced  small  device,  7-27 man/machine,  8-1,  (See also, man/machine interfaces) requestor  extension,  5-25 small  system,  7-23 Interfacing,  7-1,  7-14 components,   7-19 formats,  7-21 methods of connections, 7-17 parallel  data  operations,  7-31 serial  data  operations,  7-28 standards,  7-18 terminology,  7-1 Interference, electromagnetic, 1-14 Interleave,  6-7 Interleave factor, fixed disk, 10-26 Internal  connectors,  2-18 Interrupt,  5-10 classes I-IV, 5-12 codes,  5-13 driven  I/O,  7-15 external  data,  7-2 external sequence of events, 7-34 external  words,  7-9 handling  process,  5-13 lockout,  5-12 request,  external,  7-33 task  state,  5-10 Inventory,   environmental,   5-18 IOA, 7-4 IOC, 7-3 J Jumpers,  8-16 K Key switches, 3-2 INDEX-7