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Little Computer 3, or LC-3, is a type of computer educational programming language, an assembly language, which is a type of low-level programming language.. It features a relatively simple instruction set, but can be used to write moderately complex assembly programs, and is a viable target for a C compiler.
An instruction set architecture (ISA) is an abstract model of a computer, also referred to as computer architecture.A realization of an ISA is called an implementation.An ISA permits multiple implementations that may vary in performance, physical size, and monetary cost (among other things); because the ISA serves as the interface between software and hardware.
LC3 or LC-3 may refer to: LC3 (classification), a para-cycling classification; Little Computer 3, a type of computer educational programming language; Limestone Calcined Clay Cement, a low-carbon cement; Fauteuil Grand Confort, a club chair designed by Le Corbusier and Charlotte Perriand; MAP1LC3B, a protein involved in autophagy; MAP1LC3A, a ...
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The first was the CISC (Complex Instruction Set Computer), which had many different instructions. In the 1970s, however, places like IBM did research and found that many instructions in the set could be eliminated. The result was the RISC (Reduced Instruction Set Computer), an architecture that uses a smaller set of instructions.
DLX instructions can be broken down into three types, R-type, I-type and J-type. R-type instructions are pure register instructions, with three register references contained in the 32-bit word. I-type instructions specify two registers, and use 16 bits to hold an immediate value. Finally J-type instructions are jumps, containing a 26-bit address.
An orthogonal instruction set does not impose a limitation that requires a certain instruction to use a specific register [1] so there is little overlapping of instruction functionality. [ 2 ] Orthogonality was considered a major goal for processor designers in the 1970s, and the VAX-11 is often used as the benchmark for this concept.