Minimal Instruction Set Computer (MISC)
A type of ISA that focuses on a minimal set of opcodes and is generally stack-based rather than register-based.
(en.wikipedia.org) Minimal instruction set computer - Wikipedia website
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Minimal instruction set computer (MISC) is a central processing unit (CPU) architecture, usually in the form of a microprocessor, with a very small number of basic operations and corresponding opcodes, together forming an instruction set. Such sets are commonly stack-based rather than register-based to reduce the size of operand specifiers.
Such a stack machine architecture is inherently simpler since all instructions operate on the top-most stack entries.
One result of the stack architecture is an overall smaller instruction set, allowing a smaller and faster instruction decode unit with overall faster operation of individual instructions.