Answered: Modify the program so that it can…

Computer Networking: A Top-Down Approach (7th Edition)

7th Edition

ISBN:9780133594140

Author:James Kurose, Keith Ross

Publisher:James Kurose, Keith Ross

Chapter1: Computer Networks And The Internet

Section: Chapter Questions

Problem R1RQ: What is the difference between a host and an end system? List several different types of end...

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Question

Modify the program so that it can accept three-digit operands up to 999 and a sum <= 1998.

.ORIG x3000 ; begin at x3000
; input two numbers
IN ;input an integer character (ascii) {TRAP 23}
LD R3, HEXN30 ;subtract x30 to get integer
ADD R0, R0, R3
ADD R1, R0, x0 ;move the first integer to register 1
IN ;input another integer {TRAP 23}
ADD R0, R0, R3 ;convert it to an integer
; add the numbers
ADD R2, R0, R1 ;add the two integers
; print the results
LEA R0, MESG ;load the address of the message string
PUTS ;"PUTS" outputs a string {TRAP 22}
ADD R0, R2, x0 ;move the sum to R0, to be output
LD R3, HEX30 ;add 30 to integer to get integer character
ADD R0, R0, R3
OUT ;display the sum {TRAP 21}
; stop
HALT ;{TRAP 25}
; data
MESG .STRINGZ "The sum of those two numbers is: "
HEXN30 .FILL xFFD0 ; -30 HEX
HEX30 .FILL x0030 ; 30 HEX
.END