Question: I created a program for this question Write a PEP/9 machine language program to add the three numbers 2, 3, and 6 and output

I created a program for this question "Write a PEP/9 machine language program to add the three numbers 2, 3, and 6 and output the sum on the output device. Store the 3 in hexadecimal. Do not use the subtract, negate, or invert instructions. Write the program in a format suitable for the loader and execute it on the Pep/9 simulator." but I don't know why my program assembles and loads but does not execute any input or output. Also, if you could store -3 in hexadecimal, I couldn't figure out how I should do it. I did this program in Pep/9. PLEASE HELP!!!

Below is my program:

num1: .BLOCK 2 ;global variable #2d

num2: .BLOCK 2 ;global variable #2d

num3: .BLOCK 2 ;global variable #2d

sum: .BLOCK 2 ;global variable #2d

;

main: DECI num1,d

LDBA 2,i

STBA num1,d

DECI num2,d

LDBA -3,i

STBA num2,d

DECI num3,d

LDBA 6,i

STBA num3,d

LDWA num1,d

ADDA num2,d

ADDA num3,d

STWA sum,d

STRO msg,d

DECO sum,d

STOP

msg: .ASCII "sum = \x00"

.END

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