Assignment 11:

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# Finding the smallest value in memory

• \$500 contains an array of words, with the number of elements in D0. Write a routine that finds the smallest
value and stores it the memory pointed to be A0.
• The program should start at \$2000.
• Fix any syntax errors after you assemble.
• Start the simulator, and set registers and add edit the array.
• Run the program and check that result is the result intended.
• You need to reset PC if you want to rerun the program.
• Show the screenshots of the program in action, to show the workings.

Solution:

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## program.X68

```ORG    \$2000
SMALLEST:                  ; smallest subroutine
; address of place to save the minimum is in A0
; number of elements in the array is in D0
MOVEM.L D0-D2/A0-A1,-(SP)   ; save used registers in the stack

MOVE.W (A1)+,D1      ; load first value from the array into D1, which will hold the minimum
SUBI.L #1,D0        ; we used the first number, decrement element count
LOOP:
CMP.L #0,D0         ; if the count is zero
BEQ DONE            ; we are done
MOVE.W (A1)+,D2      ; load a number from the array
CMP.W D1,D2         ; compare the current element with the minimum
BGT NEXT            ; if the element is bigger than the minimum, skip
MOVE.W D2,D1        ; otherwise, set element as new minimum
NEXT:
SUBI.L #1,D0        ; decrement number of elements to compare
BRA   LOOP          ; repeat
DONE:
MOVE.W D1,(A0)      ; at the end D1 has the minimum, save it in the given address

MOVEM.L (SP)+,D0-D2/A0-A1   ; recover saved registers from the stack
RTS                 ; return from subroutine

END  SMALLEST```

Instructions

For running it I used the following starting values:

D0 = 10

A0=\$1000

Memory data in \$500: 8, 4, 7, 3, 6, 2, 5, 9, 1, 2, all words (2 bytes each)

The file “screenshot-start.png” shows the initial screen for the simulator.

After running you can see in the “screenshot-end.png” that memory position \$1000 has the value 1, which is the minimum, or smallest value in the array.

The code is written as a subroutine as requested, it saves the registers it uses at the start of the subroutine and it restores their value at the end of it, the subroutine exits with the instruction RTS or return from subroutine.

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## screenshot-start.png

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## Index:

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