A central processing unit for executing instructions of variable length in which an operand specifier for specifying the addressing mode of an operand is independent of an operation code for ascertaining the kind of an operation and the number of operands. Each operand specifier is formed of one or more...http://www.google.ca/patents/US4530050?utm_source=gb-gplus-sharePatent US4530050 - Central processing unit for executing instructions of variable length having end information for operand specifiers
