A computational instruction with operands is command so computational instructionis just a opcode.
B. opcode
<span>The first personal computer operating system was named DOS.
DOS stands for disk operating system. A system software that manages hardware and software resources is an operating system and </span>the personal computer is used by one person at a time. The first personal computer was the ENIAC (<span>Electronic Numerical Integrator and Computer</span>) which became operational in 1946.
