Write a 68000 assembly program to compare two strings of 15 ASCII characters. Th

Question

Write a 68000 assembly program to compare two strings of 15 ASCII characters. The first string is stored starting at $502030. The second string is stored at location $302510. The ASCII character in location $502030 of string 1 will be compared with the ASCII character in location $302510 of string 2, [$502031] will be compared with [$302511], and so on. Each time there is a match, store $EEEE onto the stack; otherwise, store $0000 onto the stack. Assume user mode.

PLEASE DO USING 68000 MOTOROLA ASSEMBLY LANGUAGE. I HAVE SOME OTHER METHODS BUT I HAVE BEEN CHECKING THEM AND ITS NOT WORKING LIKE I THOUGHT :( HELP!

Explanation / Answer

Code of the asked quesion is given below

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START:

LEA $502030,A3 ; load first string in A3
LEA $302510,A4   ; load 2nd string in A4
  
MOVE.B #0,D4
  
LOOP:
ADD.B #1,D4
  
MOVE.B (A4)+,D1
MOVE.B (A3)+,D2
  

  
CMP.B #0,D1
BEQ CHECKAGAIN
  
CMP.B #0,D2
BEQ NOTEQU
  
CMP.B D1,D2
BEQ LOOP
BNE NOTEQU
  
EQU:
  
LEA MES2,A1
  
MOVE.B #14,D0
TRAP #15
BRA EXIT
  
  
CHECKAGAIN:
CMP.B #0,D2
BEQ EQU
  
NOTEQU:
  
LEA MES1,A1
MOVE.B #14,D0
TRAP #15
  
LEA MES3,A1
MOVE.B #14,D0
TRAP #15

  
MOVE.W D4,D1
  
MOVE.B #3,D0   
TRAP #15
EXIT:
MOVE.B #9,D0
TRAP #15   

MES1 DC.B 'STRINGS DON'T MATCH',$0D,$0A,0
MES3 DC.B 'AT ',0
MES2 DC.B 'STRINGS MATCH',0

END START

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