Place a GETS subroutine where it says too.    ; Main program to test the subroutine GETS ; This program simply prompts for two strings and ; displays them back using PUTS ; -------------------------------------------------------------------------   .ORIG x3000   ; Set up the user stack: LD R6, STKBASE ; Sets up the stack by loading the base address into R6   ; Prompt for the first string: LEA R0, PRMPT1 ; Loads the address of PRMPT1 into R0 PUTS   ; Call GETS to get first string: LEA R0, STRNG1 ; Loads the address of STRNG1 ADD R6, R6, #-1 ; Push the address to store the string at STR R0, R6, #0 JSR GETS ; Call GETS ADD R6, R6, #2 ; Clean up (pop parameter & return value)   ; Prompt for second string: LEA R0, PRMPT2 ; Loads the address of PRMPT2 PUTS   ; Call GETS to get second string: LEA R0, STRNG2 ; Loads the address of STRNG2 ADD R6, R6, #-1 ; Push the second address to store the string at STR R0, R6, #0 JSR GETS ; Call GETS ADD R6, R6, #2 ; Clean up (pop parameter & return value)   ; Output both strings: LEA R0, OUT1 ; First string... PUTS LEA R0, STRNG1 PUTS LD R0, LF ; Print a linefeed OUT ; Write character to console (TRAP x21) LEA R0, OUT2 ; Second string. PUTS LEA R0, STRNG2 PUTS   HALT ; We are done   ; GLOBAL VARIABLES ; ---------------- STKBASE .FILL xFDFF ; The bottom of the stack will be xFDFF LF .FILL x0A ; A linefeed character STRNG1 .BLKW #80 ; Room for 79 characters (unpacked) + NULL STRNG2 .BLKW #80 ; Room for 79 characters (unpacked) + NULL PRMPT1 .STRINGZ "Please enter the first string: " PRMPT2 .STRINGZ "Please enter the second string: " OUT1 .STRINGZ "The first string was: " OUT2 .STRINGZ "The second string was: "   ; Professor's notes: ;===================================================================================== ; Place your GETS subroutine below the notes: ;===================================================================================== ; Subroutine GETS ; Paramters: Address - the address to store the string at ; ; Returns: Nothing ; ; Local variables ; Offset Description ; 0 Callee-saved register R0 ; -1 Callee-saved register R1 ; etc...