shift,  4-18 status indicating, 5-7 storage, 4-17 Regulators, 4-26 inhibit current, 6-13 integrated circuits, 4-19 switching, 4-20 voltage, 4-20 REI,  5-25 Relative operand addressing, 8-14 Remote consoles,   3-13 operator control units, 3-13 Requestor extension interface (REI), 5-25 Requests independent control, 7-18 input  data,  7-33 output  data,  7-33 Requirements functional operations, 1-14 operational, 1-14 power,  2-21 Ribbon cables, 2-24 Ring, token, 7-24 ROM, 5-17, 6-26 ROM based diagnostics, 8-18 RS-232, 7-24 pin description, 7-30 RS-422, 7-24 RS-449,  7-23 RTC,  5-5 Run mode, 8-15 S Safety/security features of frames/cabinets, 2-12 Sampling,  13-3 Search for sync/set suppress/set monitor, 7-14 Sectors,  disk,  10-3 Security, ADP, 1-14 Select signal, 7-32 Selectors, 4-14 Semiconductor memory, 6-20 DRAM, 6-24 SRAM, 6-22 Sense  amplifiers,  4-21,6-13,6-20 Sequence enables and control, 5-5 mode,  8-15 Sequence  of  events external function, 7-34 external interrupt, 7-34 input  data,  7-33 output  data,  7-33 single  cable,  7-32 two  cable,  7-33 Sequencing  circuits,  7-13 Sequential digital logic circuits, 4-10 Serial,  7-14 data  operations,  7-28 format, 7-9 Set/clear flag, 7-14 Shift  registers,  4-18 Ship, switchboard, and computer switching control panel (CSCP) wiring, 13-34 Signals acknowledge, 7-32 audible alarms, 3-2 busy,  7-32 command,  4-13 DCE/DTE, 7-29 enable, 4-13 select,  7-32 Single-cables,   7-32 sequence of events, 7-32 Single-channel  operating  mode,  7-11 Single-phase clock systems, 4-23 Size  instructions,  8-12 Small computer system interface, 7-23 SNAP systems, 1-9 Software, 1-10, 8-4 Software revisions mainframe computer, 8-26 microcomputer,  8-20 minicomputer, 8-23 SPS, 4-30 SRAM, 6-22 ST-506/412,  7-27 Stack memory, 6-11, 6-16 queue,  interrupt,  5-13 Standards, interfacing, 7-18 Standby power supply (SPS), 4-30 State,  executive,  5-10 State, task INDEX-12