Gate Application COA Morris Mano [ Numerical on Addressing Modes]

Question

An instruction is stored at location 300 with its address fields at location 301. The address field has the value 400. A processor register RI contain the number 200.

Evaluate the effective address if the addressing mode of the instruction is (a) Direct (b) Immediate (c) Relative (d) Register Indirect (e) Index with RI as the Index register.

Comments

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Answer 1

a. Direct Addressing, Addess is given in instruction, so EA = 400
b. Immediate Addressing, Value is given in Instruction, so EA is the address of the address filed of the instruction. EA = 301
c. Relative Addressing, EA = Next Instruction Address - 400 For PC relative (Base relative also possible). So, probably 304 - 400 = -negative?
d. Register indirect, EA = ?
e. Index, EA = 200 + 400 = 600.

Comments

register indirect you have not solved sir?

it will be

[ [ r400] ] = [ REGISTER INDIRECT] =200 ?

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