System Software – SIC program to set 100 elements of array to Zero

Published on June 27, 2016 by abundantcode

Filed under Assembly Language

Last modified June 27, 2016

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Problem Statement

Suppose that ALPHA is an array of 100 words, as defined in Fig. 1.5(a). Write a sequence of instructions for SIC to set all 100 elements of the array to 0.

Solution

Line Number(ac) Code Description
1 LDA ZERO  
2 STA INDEX  
3 LOOP LDX INDEX  
4 LDA ZERO  
5 STA ALPHA, X  
6 LDA INDEX  
7 ADD THREE  
8 STA INDEX  
9 COMP K300  
10 TIX TWENTY  
11 JLT LOOP  
12 INDEX RESW 1  
13 ALPHA RESW 100  
14 ZERO WORD 0  
15 K300 WORD 100  
16 THREE WORD 3  

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