Question

; This program replaces the value in R0 with its absolute value. ; ; It does NOT modify any other registers! ; .ORIG x0200 START XXXXXXXX ; copy R0 to itself to set the condition codes based on R0 XXXXXXXX ; if R0 is NON-NEGATIVE, skip the negation (already correct) XXXXXXXX ; R0 is negative, so negate it XXXXXXXX DONE BR START .END

Answer 1

Using the knowledge in computational language in LC-3 Assembly it is possible to write a code that replaces the value in R0 with its absolute value

Writting the code

       .ORIG x0200

START

       AND R0, R0, #0  ; copy R0 to itself to set the condition codes based on R0;

                       ; i.e performing addition operation with Zero option to set the flags

       BRzp DONE       ; if R0 is NON-NEGATIVE, skip the negation (already correct);

                       ; Branch to DONE if number is poistive

       NOT R0, R0      ; R0 is negative, so negate it i.e taking 2's complement

       ADD R0, R0, #1  ; R0 = -R0 is performed successfully

DONE    BR START

       

       .END

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