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In computer science, an instruction set architecture (ISA), also called computer architecture, is an abstract model of a computer. Single accumulator organization, which names one of the general purpose registers as the accumulator and uses it to necessarily store one of the operands. This Endianness as another major architectural consideration. • CPU can store data based on o 1. A stack architecture o 2. An accumulator architecture o Basic ISA Classes. 4. © Alvin R. Lebeck. CPS 104. Accumulator. • Instruction set: Accumulator is implicit operand Base+Displacement M[Ri + v]. An Instruction Set Architecture (ISA) defines the interface between software and as Stack Architecture, Accumulator Architecture, and Register-set. Types of Instruction Sets. There are three main types of instruction sets: Stack; Accumulator; General-purpose register. These days, the first two are reallyAccumulator based CPU comprises a small set of registers namely Memory Address Register (MAR), Memory Data Register (MDR), Instruction Register (IR) and