Complete the 68000 assembly language program where the SORT1 part sets the D0/A0
ID: 3531233 • Letter: C
Question
Complete the 68000 assembly language program where the SORT1 part sets the D0/A0/A1 parameters, which are used by the SORT subroutine to sort array ARY1. D0 holds the length of the array. A0 holds the address of the first element of the array. A1 holds the address where the sorted array will be stored. The SORT2 part will, in the same analogy, sort array ARY2.
ORG $0900 ;start program at this address
LAB3 CLR.L D0 ;
BRA SORT1 ;skip over DC instructions
ARY1 DC.B 7 ;define number of elements in array1
DC.B 23,-9,18,56,-5,8,4 ;define the elements of array1
ARY1S DS.B 7 ;reserve location for sorted array1
ARY2 DC.B 12 ;define number of elements in array2
DC.B $CC,$34,$F4,$55,$E3,$E3,$3E,$17,$15,$21,$D7,$A4 ;define the elements of array2
ARY2S DS.B 12 ;reserve location for sorted array2
SORT1 ... ... ;set parameter (D0,A0,A1) to sort array1
... ... ;then call subroutine SORT
SORT2 ... ... ;set parameter (D0,A0,A1) to sort array2
... ... ;then call subroutine SORT
SORT ... ... ;subroutine SORT reads the address of
... ... ;the array from A0 and stores the sorted
... ... ;array at A1. The length of the array
... ... ;is passed via D0
MOVE.B #228,D7
TRAP #14
END
I have tried different lines of code for SORT1, SORT2, and SORT. But with each one, the assembler doesn't sort the arrays properly.
Explanation / Answer
.MODEL SMALL
.STACK 100H
.DATA
PROMPT_1 DB 'The contents of the array before sorting : $'
PROMPT_2 DB 0DH,0AH,'The contents of the array after sorting : $'
ARRAY DB 5,3,9,0,2,6,1,7,8,4
.CODE
MAIN PROC
MOV AX, @DATA ; initialize DS
MOV DS, AX
MOV BX, 10 ; set BX=10
LEA DX, PROMPT_1 ; load and display the string PROMPT_1
MOV AH, 9
INT 21H
LEA SI, ARRAY ; set SI=offset address of ARRAY
CALL PRINT_ARRAY ; call the procedure PRINT_ARRAY
LEA SI, ARRAY ; set SI=offset address of the ARRAY
CALL BUBBLE_SORT ; call the procedure BUBBLE_SORT
LEA DX, PROMPT_2 ; load and display the string PROMPT_2
MOV AH, 9
INT 21H
LEA SI, ARRAY ; set SI=offset address of ARRAY
CALL PRINT_ARRAY ; call the procedure PRINT_ARRAY
MOV AH, 4CH ; return control to DOS
INT 21H
MAIN ENDP
;------------------------- Procedure Definitions ------------------------;
;**************************************************************************;
;----------------------------- PRINT_ARRAY ------------------------------;
;**************************************************************************;
PRINT_ARRAY PROC
; this procedure will print the elements of a given array
; input : SI=offset address of the array
; : BX=size of the array
; output : none
PUSH AX ; push AX onto the STACK
PUSH CX ; push CX onto the STACK
PUSH DX ; push DX onto the STACK
MOV CX, BX ; set CX=BX
@PRINT_ARRAY: ; loop label
XOR AH, AH ; clear AH
MOV AL, [SI] ; set AL=[SI]
CALL OUTDEC ; call the procedure OUTDEC
MOV AH, 2 ; set output function
MOV DL, 20H ; set DL=20H
INT 21H ; print a character
INC SI ; set SI=SI+1
LOOP @PRINT_ARRAY ; jump to label @PRINT_ARRAY while CX!=0
POP DX ; pop a value from STACK into DX
POP CX ; pop a value from STACK into CX
POP AX ; pop a value from STACK into AX
RET ; return control to the calling procedure
PRINT_ARRAY ENDP
;**************************************************************************;
;---------------------------- BUBBLE_SORT -------------------------------;
;**************************************************************************;
BUBBLE_SORT PROC
; this procedure will sort the array in ascending order
; input : SI=offset address of the array
; : BX=array size
; output : none
PUSH AX ; push AX onto the STACK
PUSH BX ; push BX onto the STACK
PUSH CX ; push CX onto the STACK
PUSH DX ; push DX onto the STACK
PUSH DI ; push DI onto the STACK
MOV AX, SI ; set AX=SI
MOV CX, BX ; set CX=BX
DEC CX ; set CX=CX-1
@OUTER_LOOP: ; loop label
MOV BX, CX ; set BX=CX
MOV SI, AX ; set SI=AX
MOV DI, AX ; set DI=AX
INC DI ; set DI=DI+1
@INNER_LOOP: ; loop label
MOV DL, [SI] ; set DL=[SI]
CMP DL, [DI] ; compare DL with [DI]
JNG @SKIP_EXCHANGE ; jump to label @SKIP_EXCHANGE if DL<[DI]
XCHG DL, [DI] ; set DL=[DI], [DI]=DL
MOV [SI], DL ; set [SI]=DL
@SKIP_EXCHANGE: ; jump label
INC SI ; set SI=SI+1
INC DI ; set DI=DI+1
DEC BX ; set BX=BX-1
JNZ @INNER_LOOP ; jump to label @INNER_LOOP if BX!=0
LOOP @OUTER_LOOP ; jump to label @OUTER_LOOP while CX!=0
POP DI ; pop a value from STACK into DI
POP DX ; pop a value from STACK into DX
POP CX ; pop a value from STACK into CX
POP BX ; pop a value from STACK into BX
POP AX ; pop a value from STACK into AX
RET ; return control to the calling procedure
BUBBLE_SORT ENDP
;**************************************************************************;
;-------------------------------- OUTDEC --------------------------------;
;**************************************************************************;
OUTDEC PROC
; this procedure will display a decimal number
; input : AX
; output : none
PUSH BX ; push BX onto the STACK
PUSH CX ; push CX onto the STACK
PUSH DX ; push DX onto the STACK
XOR CX, CX ; clear CX
MOV BX, 10 ; set BX=10
@OUTPUT: ; loop label
XOR DX, DX ; clear DX
DIV BX ; divide AX by BX
PUSH DX ; push DX onto the STACK
INC CX ; increment CX
OR AX, AX ; take OR of Ax with AX
JNE @OUTPUT ; jump to label @OUTPUT if ZF=0
MOV AH, 2 ; set output function
@DISPLAY: ; loop label
POP DX ; pop a value from STACK to DX
OR DL, 30H ; convert decimal to ascii code
INT 21H ; print a character
LOOP @DISPLAY ; jump to label @DISPLAY if CX!=0
POP DX ; pop a value from STACK into DX
POP CX ; pop a value from STACK into CX
POP BX ; pop a value from STACK into BX
RET ; return control to the calling procedure
OUTDEC ENDP
;**************************************************************************;
;--------------------------------------------------------------------------;
;**************************************************************************;
END MAIN
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