4. Answer all the questions given below. (a) Consider the following 8086 interfacing problem. A1 AO 80H PORT A Memory addresses 81H PORT B 82H PORT C 83H CINTROL 1. REGISTER AO A1 Port A 8086 A2 Logic? CS A7 8255A The LED array connected to Port A will light up if the input string is a Palindrome Ex. of Palindrome: Input String- "abba" ; Output: String is palindrome Input String- "abbc" ; Output: String is not palindrome (i) Construction of the logic circuit to access 8255A Initialization of the control registers for the designated operation Creation of the string variables Comparison between the input string and reversed string Lighting up the LED array (ii) (iii) (iv) (v) Hints: Use LEA, SI and DI to access and compare the input and reversed strings

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