Question

For computers based on three-address instruction formats, each address field can be used to specify which of the following:

(S1) A memory operand

(S2) A processor register

(S3) An implied accumulator register

1. Either S1 or S2
2. Either S2 or S3
3. Only S2 and S3
4. All of S1, S2 and S3

Answer 1

Correct Answer - Option 1 : Either S1 or S2

In three address instruction formats, each address filled can specify a memory operand or a processor register.

E.g. ADD C B Address \\ C ← B + [Address]

But Accumulator register is implicitly used as destination address. E.g. ADD B