I need to Write a program in Easy68K to fulfill the following functions: a) Read

Question

I need to Write a program in Easy68K to fulfill the following functions: a) Read in two numbers from keyboard with instructions, one for index, one for the size of the array; b) Display the (index % size)th number in the initialized array [2 3 8 1 6 5 4].

I believe I have done this correctly, but my program lacks OUTPUT after I input the two numbers, any idea what is wrong with my program?

I need to Write a program in Easy68K to fulfill the following functions: a) Read in two numbers from keyboard with instructions, one for index, one for the size of the array; b) Display the (index % size)th number in the initialized array [2 3 8 1 6 5 4].

I believe I have done this correctly, but my program lacks OUTPUT after I input the two numbers, any idea what is wrong with my program?

  START:       lea array1,A0    for D2 = #0 to #1 do.s     lea prompt,A1  move.b #13,D0     trap #15    move.b #4,D0  trap #15    move.l D1,(A0,D2)     endf    lea result,A1  move.b #13,D0     trap #15    for D2 = #0 to #2 do.s  move.l (A0,D2),D1     move.b #3,D0  trap #15    lea crlf,A1  move.b #14,D0     trap #15  endf    MOVE.B #9,D0  TRAP #15      array1 ds.l 2 2  prompt dc.b 'Enter the number: ',0     result dc.b 'The entered numbers are: ',0     crlf dc.b $d,$a,0  END START  

Explanation / Answer

ORG $1000
START: ; first instruction of program

LEA MESSAGE1,A1 *Loads message into address register A1
MOVE.B #14,D0 *Moves number 14 into data regiter D0
TRAP #15 *Displays Message

string move.b #5,d0
trap #15
cmp.l #0,d1
beq print
move.b d1,(a6)+
bra string

LEA MESSAGE2,A1 *Loads message into address register A1
MOVE.B #14,D0 *Moves number 14 into data regiter D0
TRAP #15 *Displays Message
print  
move.b (a6)+,d1
move.b #4,d0
trap #15   
cmp.l #0,d1
bra print

MOVE.B #9,D0
TRAP #15 ; halt simulator

message1 dc.b 'enter your string: ',0

message2 dc.b 'string you hav entered is: ',0

cr dc.b 0

END START ; last line of source

example 2:
==========
ORG $1000
START: ; first instruction of program

LEA MESSAGE1,A1 *Loads message into address register A1
MOVE.B #14,D0 *Moves number 14 into data regiter D0
TRAP #15 *Displays Message

LEA BUFFER,A1 ; Where to store input string
MOVE.B #2,D0 ; Read string
TRAP #15

LEA MESSAGE2,A1 *Loads message into address register A1
MOVE.B #14,D0 *Moves number 14 into data regiter D0
TRAP #15 *Displays Message

LEA BUFFER,A1 ; String to display
MOVE.B #13,D0 ; Display string with newline
TRAP #15

MOVE.B #9,D0
TRAP #15 ; halt simulator

message1 dc.b 'enter your string: ',0
message2 dc.b 'string you have entered is: ',0

ds.w 0 ; force even address
buffer ds.b 80 ; input string storage

END START ; last line of source

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