View source for CSC270 Example 6811 Program

--[[User:Thiebaut|D. Thiebaut]] 09:42, 21 March 2011 (EDT)
----


      ; compute the sum of the contents of an array (table) 
      ; of 5 bytes.  The result is stored in a variable called
      ; sum
 
                           ;--- data section ---
                           ORG   0000
      0000 02       table  FCB   2,3,4,1,7        ; create an array of 5 bytes
      0001 03
      0002 04
      0003 01
      0004 07
      0005 00       sum    FCB   0 
 
 
                    ;--- code section ---
                           ORG   0010
      0010 CE 00 00 START: LDX   #0000            ; IX = 0, address of 1st byte of array
      0013 A6 00           LDAA  0,X              ; ACCA = mem[0]
      0015 AB 01           ADDA  1,X              ; ACCA = ACCA + mem[1]
      0017 AB 02           ADDA  2,X              ; ACCA = ACCA + mem[2]
      0019 AB 03           ADDA  3,X              ; ACCA = ACCA + mem[3]
      001B AB 04           ADDA  4,X              ; ACCA = ACCA + mem[4]
      001D 97 05           STAA  05               ; sum = ACCA
 
      001F 7E FC 00        JMP   FC00             ; Restart the monitor (OS)


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[[Category:CSC270]][[Category:6800]]