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.