System Software – SIC/XE program to clear 20 byte string using Immediate addressing mode.

Published on June 27, 2016 by abundantcode

Filed under Assembly Language

Last modified June 27, 2016

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Problem Statement

Write a sequence of instructions for SIC/XE to clear a 20-byte string to all blanks. Use immediate addressing and register-to-register instructions to make the process as efficient as possible.

Solution

Line Number(ac) Code Description
1 LDT #20  
2 LDX #0  
3 LOOP LDCH #0  
4 STCH STR1,X  
5 TIXR T  
6 JLT LOOP  
7 STR1 RESW 20  

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