261 Logics, Arithmetics, Logic design, Switching theory, Analog-digital converters
261.1 Logics, Arithmetics
261.12 Boolean algebra (Hardware)
261.14 Threshold logic
261.16 Arithmetic, Ternary logic, Multiple-valued logic
261.18 Arithmetics-Other
261.2 Design automation
261.3 Theoretical logic design, Switching theory
261.5 Applied methods of logic design, Applied methods of switching theory
261.6 VLSI Systems
261.7 Design Language. See also: 242.17 Programming Languages--High Level Machine Oriented Languages, System Implementation Languages.
262 Computer Systems Organization (Architecture)
262.1 Descriptions of machines
262.12 Minicomputer systems
262.13 Microcomputers, Microprogramming
262.14 Commercially available machines
262.15 Super computers, Super computer applications
262.16 Unique machines, Special-purpose machines, Parallel processors
262.17 Multiprocessors, Distributed Memory Computers, Array Processes
262.3 Machine organization-consideration, Machine organization-concepts
262.32 Evaluation of hardware
262.34 Software for describing architecture, Languages for describing architecture
262.35 Optical computers
262.36 Networks, Communications, Wireless communications
262.37 Memory organization (see also 263.4)
262.39 Modular construction, Bit slice, Fault-tolerant design
262.4 Fault detection
262.8 Analog computers, Hybrid computers, Hybrid Systems, Quantum Computation, DNA Computation [C.1.m]
262.9 Interfacing, Interfaces
263 Component circuits, Component modules
263.1 Circuit theory, Physical electronics
263.2 Arithmetic units (see also 261.1)
263.4 Storage units
263.5 Input/Output equipment
263.6 Auxiliary off-line equipment
263.7 Auxiliary on-line equipment