+1 vote

(i) In autoincrement addressing mode address of the operand is computed first followed by an increment of the content of the register
(ii) In autodecrement addressing mode address of the operand is computed first followed by a decrement of the content of the register.
(iii) In autoincrement addressing mode address of the operand is computed after the increment of the content of the register
(iv) In autodecrement addressing mode address of the operand is computed after the decrement of the content of the register.

Which of the above statements is/are TRUE?
(A) (i) and (ii) only
(B) (i) and (iii) only
(C) (i) and (iv) only
(D) (ii) and (iii) only

reshown Jun 5

$\\ (R)+ = This\ is\ auto\ increment\ in\ which\ operand\ is\ calculated\ first\\ and\ then\ we \ increment\ the\ content \ of \ register. \\ \\ -(R)= This\ is\ auto decrement\ in\ which\ operand \ is \ calculated\ after\\ the \ decrement\ of \ the \ content \ of\ register$

Therefore ans should be C.

answered Jun 5 by (8,720 points)
selected Jun 5
EA = (X)− is the effective address equal to the contents of location
X, with X decremented by one word length after the effective address is calculated.

it is correct ?