A one-instruction set computer (OISC), sometimes referred to as an ultimate reduced instruction set computer (URISC), is an abstract machine that uses only one instruction – obviating the need for a machine language opcode.[1][2][3] With a judicious choice for the single instruction and given arbitrarily many resources, an OISC is capable of being a universal computer in the same manner as traditional computers that have multiple instructions.[2]: 55 OISCs have been recommended as aids in teaching computer architecture[1]: 327 [2]: 2 and have been used as computational models in structural computing research.[3] The first carbon nanotube computer is a 1-bit one-instruction set computer (and has only 178 transistors).[4]
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