high-level format, 10-29 Hub,  7-2 low-level format, 10-28 Formats, data, 4-24 Frames/cabinets, 2-7 cage/rack,  2-10 chassis/assembly, 2-8 modular, 2-8 motherboard/backplane,    2-11 safety/security features, 2-12 Full-word instructions, 8-12 Function commands control words, 7-8 external  acknowledge,  7-33 external data, 7-2 external  request,  7-33 external sequence of events, 7-34 Functional operation, 1-7 battle short mode, 1-13 block diagrams, 2-2 decision  making,  4-11 layouts,  2-4 online and offline, 1-12 operational   capabilities/limitations,   1-13 operational requirements, 1-14 operational uses, 1-7 Functions computer,  1-1 instruction/control, 5-6 memory, 4-15 G Gaskets,  2-12 Gates, digital logic, 4-9 Gateway,  7-2 Gather  data,  1-2 General linear circuits, 4-19 Gray  code,  13-4 Ground,  7-32 Guards,  3-2 H Half-word instructions, 8-12 Hamming code, 6-8 Handshaking, 7-2 Hexadecimal,  4-3 Hours (time totalizing meter), 3-2 I I/O  (See  input/output) IC bipolar,  4-7 categories,  4-7 digital,  4-7 families,  4-7 linear,  4-18 metal-oxide semiconductor, 4-7 packaging,  4-5 size, 4-5 ID lines,  7-33 sequence  of  events,  7-33 IDA, 7-33 IDR, 7-33 IEEE 802.3 (Ethernet DIX), 7-25 802.5,7-24 Immediate  operand  addressing,  8-11 Impact  printers,  12-7 chain  and  band  printers,  12-8 character  printers,  12-9 daisy  wheel  printers,  12-10 dot matrix printers, 12-9 drum  printers,  12-7 line  printers,  12-7 Implicit (implied) operand addressing, 8-11 Independent  request  control,  7-18 Index  registers,  5-6 Indexed operand addressing, 8-12 Indicators, operator controls, 3-2 Indirect operand addressing, 8-12 Inhibit  current  regulator,  6-13 Initiate transfer, 7-14 Input cable,  7-33 data  lines,  7-33 data   request/acknowledge,   7-33 data  sequence  of  events,  7-33 Input/output,  7-1 circuits,  7-11,  7-13 control  memory,  7-13 data  arrangement,  7-8 functions,   7-12 INDEX-6