1. Computer Systems and Assembly Language Input and output operations
Eltayeb Abuelyaman
CS Week # 15

2. Character Operations chari 0x000d,d chari 0x000e,d charo 0x000e,d
charo 0x000d,d
stop
.block 1
.end

3. Input and Output Operations
Determine the object code and predict the output of the following program
DECO ‘m’,i
CHARO ‘\n’,i
DECO “mm”,i
CHARO ‘\n’,I
CHARO 0x0026,I
STOP
.END

4. Labels
Determine the values of the symbols here and there and write the object code in hexadecimal
BR there
here: .word
there: DECO here,d
STOP
.END

5. An HLL program to compute modulo 16 of input numbers
#include <isotream>
Using namespace std;
Int num;
Int main() {
cin >> num;
remain = num %16;
cout << “num = “” << endl;
return 0; }

6. A program to compute Modulo a Number
br start
num: block 1
result: ASCII " sum = \X00"
start: deci num,d
lda num,d
anda x000f,i
sta num,d
stro result,d
deco num,d
charo '\n',i
stop
.end

7. Stack Relative Addressing
br reverse
first: word 'S'
second: word 'U'
third: word 'B'
reverse: lda first,d
stbytea ,s
lda second,d
stbytea ,s
lda third,d
stbytea ,s
subsp ,i
charo ,s
charo ,s
charo ,s