A distinction between machines can be made on the basis of the ALU instructions;
whether these instructions use data from the memory or not. If the ALU instructions use
only the CPU registers for the operands and result, the machine type is called “loadstore”.
Other machines may have a mixture of register-memory, or memory-memory
instructions.
The number of memory operands supported by a typical ALU instruction may vary from
0 to 3.
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